Tue·Jul 12, 2022Tuesday·July 12, 2022

1. 01*

   Five texture zeros in the lepton sector and neutrino oscillations at DUNE

   Richard H. Benavides🇨🇴 · D.V. Forero🇨🇴 · Luis Muñoz🇨🇴 · Jose M. Muñoz🇨🇴 · Alejandro Rico🇨🇴 · A. Tapia🇨🇴

   In this work, we have assumed special structures for the charged and neutral mass matrices in the lepton sector, inspired by structures for the up and down quark mass matrices that result by assuming a certain number of symmetrical zeros in their entries named texture zeros. A prediction of the lepton mixing matrix results from the rotation matrices that diagonalize the mass matrices in the neutral and charged lepton sectors. The use of texture zeros reduces the number of spurious parameters to the minimal ones needed to explain observations i.e. charged lepton masses and neutrino oscillation parameters. Specifically, we have considered the case of five texture zeros and we have confronted the resulting lepton mixing matrices with current measurements in the neutrino sector. Finally, sensitivities to the independent parameters in the mixing predicted by the nonequivalent forms were studied using simulated events at the DUNE neutrino oscillation experiment. We have found that DUNE is sensitive to nonzero CP violation allowed in the models.

   hep-phhep-exPRD(2023)·7 citations
2. 02*

   Photon-pion transition form factor of two photon process at BESIII from light-cone quantum field theory

   Yining Xian🇨🇳 · Bo-Qiang Ma🇨🇳

   This work studies the experiments of two-photon processes at BESIII from a theoretical viewpoint in light-cone quantum field theory. We adopt the momentum space wave function of the pion in the light-cone formalism by two forms of the Brodsky-Huang-Lepage~(BHL) prescription and the light-cone holographic QCD. We find that the wave function got by the light-cone holographic QCD can be related to the BHL wave function by a Jacobian factor. Then we calculate the transition form factor~(TFF) of the two-photon process by these two wave functions under the light-cone quark model. We compare the calculated results with the preliminary experimental data at BESIII and also other theoretical calculations.

   hep-phNPA(2022)·2 citations
3. 03*

   Lepton Flavour Violation in Hadron Decays of the Tau Lepton within the Littlest Higgs Model with T-parity

   Iván Pacheco🇲🇽 · Pablo Roig🇲🇽

   We first study the hadronic lepton flavor violating tau decays within the littlest Higgs model with T-parity (including one or two pseudoscalars, or a vector resonance). We consider the case where only T-odd particles and partner fermions contribute, and also its extension including Majorana neutrinos coming from an inverse seesaw. In both cases our mean values lie only one order of magnitude below current upper limits, strengthening the case of searching for these decays in the quest for new physics.

   hep-phJHEP(2022)·10 citations
4. 04*

   Jet shapes in H/V boson + jet with $k_t$ clustering at hadron colliders

   K. Khelifa-Kerfa🇩🇿 · Y. Delenda🇩🇿 · N. Ziani🇩🇿

   We present analytical calculations of the distribution of non-global jet shapes in Higgs/vector boson + jet production at hadron colliders. Within the eikonal-limit framework and implementing various jet algorithms, we compute the full distribution of the particular jet mass shape observable at 2-loops, including the large single-logarithms known as non-global logs and clustering logs. We compare our next-to-leading-log analytical resummation to parton showers and, after matching and including non-perturbative effects, to experimental data. A good agreement is shown for all comparisons.

   hep-phhep-ex0 citations
5. 05*

   DarkNews: a Python-based event generator for heavy neutral lepton production in neutrino-nucleus scattering

   Asli M. Abdullahi🇺🇸 · Jaime Hoefken Zink🇮🇹 · Matheus Hostert🇬🇧 · Daniele Massaro🇮🇹 · Silvia Pascoli🇮🇹

   We introduce DarkNews, a lightweight Python-based Monte-Carlo generator for beyond-the-Standard-Model neutrino-nucleus scattering. The generator handles the production and decay of heavy neutral leptons via additional vector or scalar mediators, as well as through transition magnetic moments. DarkNews samples pre-computed neutrino-nucleus upscattering cross sections and heavy neutrino decay rates to produce dilepton and single-photon events in accelerator neutrino experiments. We present two case studies with differential distributions for models that can explain the MiniBooNE excess. The aim of this code is to aid the neutrino theory and experimental communities in performing searches and sensitivity studies for new particles produced in neutrino upscattering.

   hep-phhep-exComput.Phys.Commun.(2024)·12 citations
6. 06*

   Machine learning the trilinear and light-quark Yukawa couplings from Higgs pair kinematic shapes

   Lina Alasfar🇩🇪 · Ramona Gröber🇮🇹 · Christophe Grojean🇩🇪 · Ayan Paul🇩🇪 · Zhuoni Qian🇨🇳

   Revealing the Higgs pair production process is the next big challenge in high energy physics. In this work, we explore the use of interpretable machine learning and cooperative game theory for extraction of the trilinear Higgs self-coupling in Higgs pair production. In particular, we show how a topological decomposition of the gluon-gluon fusion Higgs pair production process can be used to simplify the machine learning analysis flow. Furthermore, we extend the analysis to include $q\bar{q}\to hh$ production, which is strongly suppressed in the Standard Model, to extract the trilinear Higgs coupling and to bound large deviations of the light-quark Yukawa couplings from the Standard Model values. The constraints on the rescaling of the trilinear Higgs self-coupling, ${\kappa }_{\lambda }$, and the rescaling of light-quark Yukawa couplings, ${\kappa }_u$ and ${\kappa }_d$, at HL-LHC (FCC-hh) from single parameter fits are: \begin{eqnarray} \kappa_\lambda&=&[0.53,1.7] \;\;([0.97, 1.03])\nonumber \newline \kappa_u&=&[-470,430] \;\;([-58,55])\nonumber \newline \kappa_d&=&[-360,360] \;\;([-26,28])\nonumber \end{eqnarray} We show that the simultaneous modification of the Yukawa couplings can dilute the constraints on the trilinear coupling significantly. We perform similar analyses for FCC-hh. We discuss some motivated flavourful new physics scenarios where such an analysis prevails.

   hep-phhep-exJHEP(2022)·25 citations
7. 07*

   Systematic analysis of strange single heavy baryons ${\Xi }_c$ and ${\Xi }_b$

   Zhen-Yu Li · Guo-Liang Yu · Zhi-Gang Wang · Jian-Zhong Gu · Jie Lu

   Motivated by the experimental progress in the study of heavy baryons, we investigate the mass spectra of strange single heavy baryons in the $\lambda$-mode, where the relativistic quark model and the infinitesimally shifted Gaussian basis function method are employed. It is shown that the experimental data can be well reproduced by the predicted masses. The root mean square radii and radial probability density distributions of the wave functions are analyzed in detail. Meanwhile, the mass spectra allow us to successfully construct the Regge trajectories in the $(J,M^2)$ plane. We also preliminarily assign quantum numbers to the recently observed baryons, including ${\Xi }_c(3055)$, ${\Xi }_c(3080)$, ${\Xi }_c(2930)$, ${\Xi }_c(2923)$, ${\Xi }_c(2939)$, ${\Xi }_c(2965)$, ${\Xi }_c(2970)$, ${\Xi }_c(3123)$, ${\Xi }_b(6100)$, ${\Xi }_b(6227)$, ${\Xi }_b(6327)$ and ${\Xi }_b(6333)$. At last, the spectral structure of the strange single heavy baryons is shown. Accordingly, we predict several new baryons that might be observed in forthcoming experiments.

   hep-phCPC(2023)·31 citations
8. 08*

   Charmless two-body $B$ meson decays in perturbative QCD factorization approach

   Jian Chai🇨🇳 · Shan Cheng🇨🇳 · Yao-hui Ju🇨🇳 · Da-cheng Yan🇨🇳 · Cai-Dian Lü🇨🇳 · Zhen-Jun Xiao🇨🇳

   The perturbative QCD (PQCD) approach based on $k_T$ factorization has made a great achievement for the QCD calculation of the hadronic B decays. Regulating the endpoint divergence by the transverse momentum of quarks in the propagators, one can do the perturbation calculation for kinds of diagrams including the annihilation type diagrams. In this paper, we review the current status of PQCD factorization calculation of two-body charmless $B\to PP,PV,VV$ decays up to the next-to-leading order (NLO) QCD corrections. two new power suppressed terms in decaying amplitudes are also taken into account. By using the universal input (non-perturbative) parameters, we collected the branching ratios and $\mathbf{CP}$ asymmetry parameters for all the charmless two body $B$ decays, calculated in the PQCD approach up to the NLO, including some power suppressed terms in decaying amplitudes. The results are compared with the ones from QCD factorization approach, soft-collinear effective theory approach and the current experimental measurements. For most considered B meson decays, the PQCD results for branching ratios agree well with other approaches and the experimental data. The PQCD predictions for the $\mathbf{CP}$ asymmetry parameters for many of the decay channels do not agree with other approaches, but have a better agreement with the experimental data. The longstanding $K\pi$ puzzle about the pattern of the direct CP asymmetries of the penguin-dominated $B\to K\pi$ decays can be understood after the inclusion of the NLO contributions in PQCD. The NLO corrections and power suppressed terms play an important role in the color suppressed and pure annihilation type $B$ decay modes. These rare decays are more sensitive to different types of corrections, providing opportunity to examine the factorization approach with the more precise experimental measurements.

   hep-phCPC(2022)·39 citations
9. 09*

   Applicability of Hulthen-Hellmann potential to predict the mass-spectra of heavy mesons via series expansion method

   E. P.Inyang🇳🇬 · J. E.Ntibi🇳🇬 · E. A. Ibanga🇳🇬 · E. S.William🇳🇬

   We adopt Hulthén plus Hellmann potential as the quark-antiquark interaction potential for predicting the mass spectra of heavy mesons. The adopted potential was made to be temperature-dependent by replacing the screening parameter with Debye mass.The radial Schrödinger equation was analytically solved using the series expansion method and energy eigenvalues were obtained. The energy eigenvalues is used to predict the mass spectra of heavy mesons such as charmonium and bottomonium. Four special cases were considered when some of the potential parameters were set to zero, resulting in Hellmann potential, Yukawa potential, Coulomb potential, and Hulthén potential, respectively. The present potential provides satisfying results in comparison with experimental data and the work of other researchers with a maximum error of 0.034 GeV.

   hep-ph3 citations
10. 10*

    Hadron-hadron collision mode in ReneSANCe-v1.3.0

    Serge Bondarenko🇷🇺 · Yahor Dydyshka🇷🇺 · Lidia Kalinovskaya🇷🇺 · Renat Sadykov🇷🇺 · Vitaly Yermolchyk🇷🇺

    We report an implementation of the hadron-hadron ($pp$ and $p\bar{p}$) collision mode to the Monte Carlo event generator ReneSANCe - the code that was previously developed for $e^{+}{e}^{-}$ collisions. The described extension of ReneSANCe currently contains neutral and charged current Drell-Yan prosesses $pp[p\bar{p}]\to ZX\to {\ell }^{+}{\ell }^{-}X$, $pp[p\bar{p}]\to W^{+}X\to {\ell }^{+}{\nu }_{\ell }X$ and $pp[p\bar{p}]\to W^{-}X\to {\ell }^{-}{\bar{\nu }}_{\ell }X$. We take into account complete one-loop electroweak (EW) and one-loop QCD corrections to these processes. The calculation is based on the SANC (Support for Analytic and Numeric Calculations for experiments at colliders) modules. The generator is constructed in such a way that new processes can be easily added. The paper contains a theoretical description of the SANC approach, numerical validations and a manual.

    hep-phComput.Phys.Commun.(2023)·22 citations
11. 11*

    Pion scalar, vector and tensor form factors from a contact interaction

    Xiaobin Wang🇨🇳 · Zanbin Xing🇨🇳 · Jiayin Kang🇨🇳 · Khépani Raya🇪🇸 · Lei Chang🇨🇳

    The pion scalar, vector and tensor form factors are calculated within a symmetry-preserving contact interaction model (CI) of quantum chromodynamics (QCD), encompassed within a Dyson-Schwinger and Bethe-Salpeter equations approach. In addition to the traditional rainbow-ladder truncation, a modified interaction kernel for the Bethe-Salpeter equation is adopted. The implemented kernel preserves the vector and axial-vector Ward-Takahashi identities, while also providing additional freedom. Consequently, new tensor structures are generated in the corresponding interaction vertices, shifting the location of the mass poles appearing in the quark-photon and quark tensor vertex and yielding a notorious improvement in the final results. Despite the simplicity of the CI, the computed form factors and radii are compatible with recent lattice QCD simulations.

    hep-phhep-latnucl-thPRD(2022)·20 citations
12. 12*

    Energy Dependence of Intrinsic Charm Production: What is the Best Energy for Observation?

    R. Vogt🇺🇸

    Background: A nonperturbative charm production contribution, known as intrinsic charm, was predicted in the early 1980s. Recent results have provided new evidence for its existence but further confirmation is needed. Purpose: $J/\psi$ and $\bar{D}$ meson production are calculated with a combination of perturbative QCD and intrinsic charm to determine the best energy range to study intrinsic charm production. Methods: $J/\psi$ and $\bar{D}$ meson production are calculated in perturbative QCD to next-to-leading order in the cross section. Cold nuclear matter effects, including nuclear modification of the parton densities and $p_T$ broadening by multiple scattering are taken into account in the production of both; absorption by nucleons is also included for the $J/\psi$. Contributions from intrinsic charm are calculated assuming production from a $|uudc\bar{c}⟩$ Fock state. Results: The $J/\psi$ and $\bar{D}$ meson rapidity and $p_T$ distributions are calculated as a function of rapidity and transverse momentum $p_T$ over a wide range of center-of-mass energies with and without intrinsic charm in $p+p$ collisions. The nuclear modification factor, $R_{pA}$, is also calculated for $p+\mathrm{Pb}$ interactions at appropriate energies. Previous fixed-target data as a function of Feynman $x$, $x_F$, are also compared to calculations within the approach. Good agreement with the data is found when intrinsic charm is included. Conclusions: The intrinsic charm signal may be largest at midrapidity for future low energy fixed target experiments such as the proposed NA60+.

    hep-phPRC(2022)·15 citations
13. 13*

    Dissociation Cross Sections of Large-Momentum Charmonia with Light Mesons in Hadronic Matter

    Yi-Hao Pan🇨🇳 · Wen-Hao Shi🇨🇳 · Xiao-Ming Xu🇨🇳 · H. J. Weber🇺🇸

    Momenta of charmonia created in Pb-Pb collisions at the Large Hadron Collider are so large that three or more mesons may be produced when the charmonia collide with light mesons in hadronic matter. We study the meson-charmonium collision in a mechanism where the collision produces two quarks and two antiquarks, the charm quark then fragmenting into charmed mesons, and the other three constituents as well as quarks and antiquarks created from vacuum give rise to two or more mesons. The absolute square of the transition amplitude for the production of two quarks and two antiquarks is derived from the $S$-matrix element, and cross-section formulas are derived from the absolute square of the transition amplitude and charm-quark fragmentation functions. With a temperature-dependent quark potential, we calculate unpolarized cross sections for inclusive $D^{+}$, $D^0$, $D_s^{+}$, or $D^{\ast +}$ production in scattering of charmonia by $\pi$, $\rho$, $K$, or $K^{\ast }$ mesons. At low center-of-mass energies of the charmonium and the light meson, the cross sections are very small. At high energies the cross sections have obvious temperature dependence, and are comparable to peak cross sections of two-to-two meson-charmonium reactions.

    hep-phPRC(2022)·0 citations
14. 14*

    Solar ${\bar{\nu }}_e$ flux: Revisiting bounds on neutrino magnetic moments and solar magnetic field

    Evgeny Akhmedov🇩🇪 · Pablo Martínez-Miravé🇪🇸

    The interaction of neutrino transition magnetic dipole moments with magnetic fields can give rise to the phenomenon of neutrino spin-flavour precession (SFP). For Majorana neutrinos, the combined action of SFP of solar neutrinos and flavour oscillations would manifest itself as a small, yet potentially detectable, flux of electron antineutrinos coming from the Sun. Non-observation of such a flux constrains the product of the neutrino magnetic moment $\mu$ and the strength of the solar magnetic field $B$. We derive a simple analytical expression for the expected ${\bar{\nu }}_e$ appearance probability in the three-flavour framework and we use it to revisit the existing experimental bounds on $\mu B$. A full numerical calculation has also been performed to check the validity of the analytical result. We also present our numerical results in energy-binned form, convenient for analyses of the data of the current and future experiments searching for the solar ${\bar{\nu }}_e$ flux. In addition, we give a comprehensive compilation of other existing limits on neutrino magnetic moments and of the expressions for the probed effective magnetic moments in terms of the fundamental neutrino magnetic moments and leptonic mixing parameters.

    hep-phastro-ph.SRhep-exJHEP(2022)·20 citations
15. 15*

    Lorentz Tests with Astrophysical Photons

    Fabian Kislat🇺🇸

    Astrophysical polarization measurements provide some of the strongest constraints on the photon sector of the non-minimal Standard-Model Extension. This paper reviews some recent results obtained by combining optical linear and circular polarization data from a large number of astrophysical objects.

    hep-ph0 citations
16. 16*

    Electromagnetic Flavor-Changing Lepton Decays from Lorentz and CPT Violation

    Alan Kostelecky🇺🇸 · E. Passemar🇺🇸 · N. Sherrill🇬🇧

    Lorentz- and CPT-violating effects initiating two-body electromagnetic flavor-changing decays of charged leptons are studied in the framework of Lorentz-violating effective field theory. An analysis of data from experiments at the Paul Scherrer Institute and at the Stanford Linear Accelerator measuring the branching ratios of these decays provides 576 constraints on independent flavor-changing effects in the charged-lepton sector, consistent with no Lorentz and CPT violation at the level of parts in $10^{-13}$ GeV${}^{-1}$ to $10^{-9}$ GeV${}^{-1}$.

    hep-phPRD(2022)·8 citations
17. 17*

    Texture zeros of quark mass matrices at fixed point $\tau =\omega$ in modular flavor symmetry

    Shota Kikuchi🇯🇵 · Tatsuo Kobayashi🇯🇵 · Morimitsu Tanimoto🇯🇵 · Hikaru Uchida🇯🇵

    We study systematically derivation of the specific texture zeros, that is the nearest neighbor interaction (NNI) form of the quark mass matrices at the fixed point $\tau =\omega$ in modular flavor symmetric models. We present models that the NNI forms of the quark mass matrices are simply realized at the fixed point $\tau =\omega$ in the $A_4$ modular flavor symmetry by taking account multi-Higgs fields. Such texture zero structure originates from the $ST$ charge of the residual symmetry $Z_3$ of $SL(2,Z)$. The NNI form can be realized at the fixed point $\tau =\omega$ in $A_4$ and $S_4$ modular flavor models with two pairs of Higgs fields when we assign properly modular weights to Yukawa couplings and $A_4$ and $S_4$ representations to three generations of quarks. We need four pairs of Higgs fields to realize the NNI form in $A_5$ modular flavor models.

    hep-phEPJC(2023)·29 citations
18. 18*

    TUJU21: nuclear PDFs with electroweak-boson data at NNLO

    Ilkka Helenius🇫🇮 · Marina Walt🇩🇪 · Werner Vogelsang🇩🇪

    Nuclear parton distribution functions (nPDFs) can be determined in a global QCD analysis using a wide range of experimental data. In addition to older fixed-target deep inelastic scattering and Drell-Yan (DY) dilepton production data, several analyses from p+Pb collisions at the LHC provide further constraints and extend the kinematic reach of applicable data. Here we present an update of our previous TUJU19 analysis where we now include also electroweak-boson production data recently measured by ATLAS and CMS. For the first time, LHC data are included in a nPDF analysis performed at next-to-next-to-leading order (NNLO) in perturbative QCD. As before, our setup is based on the open-source analysis framework xFitter and we fit our own proton baseline, ensuring a fully consistent setup. We find good agreement with the applied data and that the resulting ${\chi }^2/N_{\mathrm{df}}$ is significantly smaller in case of the NNLO analysis (0.84) compared to our NLO analysis (0.94). Also, we present comparisons between our NNLO calculations and electroweak-boson production data in Pb+Pb collisions from ATLAS and CMS and DY data recently measured by CMS where NNLO corrections are found significant.

    hep-ph11 citations
19. 19*

    Approximate N${}^3$LO Parton Distribution Functions with Theoretical Uncertainties: MSHT20aN${}^3$LO PDFs

    J. McGowan🇬🇧 · T. Cridge🇬🇧 · L. A. Harland-Lang🇬🇧 · R. S. Thorne🇬🇧

    We present the first global analysis of parton distribution functions (PDFs) at approximate N${}^3$LO in the strong coupling constant ${\alpha }_s$, extending beyond the current highest NNLO achieved in PDF fits. To achieve this, we present a general formalism for the inclusion of theoretical uncertainties associated with the perturbative expansion in the strong coupling. We demonstrate how using the currently available knowledge surrounding the next highest order (N${}^3$LO) in ${\alpha }_s$ can provide consistent, justifiable and explainable approximate N${}^3$LO (aN${}^3$LO) PDFs. This includes estimates for uncertainties due the the currently unknown N${}^3$LO ingredients, but also implicitly some missing higher order uncertainties (MHOUs) beyond these. Specifically, we approximate the splitting functions, transition matrix elements, coefficient functions and $K$-factors for multiple processes to N${}^3$LO. Crucially, these are constrained to be consistent with the wide range of already available information about N${}^3$LO to match the complete result at this order as accurately as possible. Using this approach we perform a fully consistent approximate N${}^3$LO global fit within the MSHT framework. This relies on an expansion of the Hessian procedure used in previous MSHT fits to allow for sources of theoretical uncertainties. These are included as nuisance parameters in a global fit, controlled by knowledge and intuition based prior distributions. We analyse the differences between our aN${}^3$LO PDFs and the standard NNLO PDF set, and study the impact of using aN${}^3$LO PDFs on the LHC production of a Higgs boson at this order. Finally, we provide guidelines on how these PDFs should be be used in phenomenological investigations.

    hep-phhep-exEPJC(2023)·167 citations
20. 20*

    Neutrino Mass Ordering -- Circumventing the Challenges using Synergy between T2HK and JUNO

    Sandhya Choubey🇸🇪 · Monojit Ghosh🇮🇳 · Deepak Raikwal🇮🇳

    One of the major open problems of neutrino physics is MO (mass ordering). We discuss the prospects of measuring MO with two under-construction experiments T2HK and JUNO. JUNO alone is expected to measure MO with greater than $3\sigma$ significance as long as certain experimental challenges are met. In particular, JUNO needs better than 3$\%$ energy resolution for MO measurement. On the other hand, T2HK has rather poor prospects at measuring the MO, especially for certain ranges of the CP violating parameter ${\delta }_{\mathrm{CP}}$, posing a major drawback for T2HK. In this letter we show that the synergy between JUNO and T2HK will bring two-fold advantage. Firstly, the synergy between the two experiments helps us determine the MO at a very high significance. With the baseline set-up of the two experiments, we have a greater than $9\sigma$ determination of the MO for all values of ${\delta }_{\mathrm{CP}}$. Secondly, the synergy also allows us to relax the constraints on the two experiments. We show that JUNO, could perform extremely well even for energy resolution of 5$\%$, while for T2HK the MO problem with "bad" values of ${\delta }_{\mathrm{CP}}$ goes away. The MO sensitivity for the combined analysis is expected to be greater than $6\sigma$ for all values of ${\delta }_{\mathrm{CP}}$ and with just 5$\%$ energy resolution for JUNO.

    hep-phhep-exPRD(2022)·9 citations
21. 21*

    Axion electrodynamics: Energy-momentum tensor, and possibilities for experimental tests

    Iver H. Brevik · Moshe M. Chaichian

    Axion electrodynamics is based upon the Lagrangian of the electromagnetic (EM) field plus its interaction with the axions, and is accordingly a physically open system. It means that the four-divergence of the EM energy-momentum tensor is different from zero, implying in turn that the total EM energy and momentum (when integrated over all space) do not constitute a four-vector. The EM force is in principle accessible to experimental detection, just analogous to what is the case in ordinary electrodynamics. In the first half of this paper the energy-momentum aspects of axion electrodynamics are worked out in general, when the surroundings are allowed to be a medium with constant permittivity and permeability. In the second half, two examples are discussed. The first is a static situation, where a block of uniform material containing axions is exposed to external strong electric and magnetic fields. Assuming the axion amplitude $a(x)$ (i.e. its density) to increase linearly in one direction, we calculate the axion-generated forces. As a second example, we consider axions varying not with position but instead harmonically with time; this is the constellation usually assumed in astrophysics. Assuming a Gaussian profile for the EM wave emitted from the Earth towards an axion cloud in outer space, we make a calculation of the 'axion echo', the return signal.

    hep-phhep-thInt.J.Mod.Phys.A(2022)·10 citations
22. 22*

    Improved understanding of the peaking phenomenon existing in the new di-$J/\psi$ invariant mass spectrum from the CMS Collaboration

    Jun-Zhang Wang🇨🇳 · Xiang Liu🇨🇳

    Very recently, the CMS Collaboration reported a peaking phenomenon existing in the di-$J/\psi$ invariant mass spectrum from $pp$ collision, by which the $X(6900)$ structure announced by the LHCb Collaboration was confirmed, but also more enhancement structures were discovered. Facing such a novel phenomenon, in this work we indicate that these new features reflected from the CMS measurement provide a good implication for a dynamical mechanism which reproduces the novel peaking phenomenon in the reported $J/\psi$-pair mass spectrum well. This mechanism is due to special reactions, where different charmonium pairs directly produced by $pp$ collision may transit into the final state of $J/\psi J/\psi$. The present work provides a special viewpoint to decode these observed fully charm structures in the $J/\psi$-pair invariant mass spectrum.

    hep-phhep-exPRD(2022)·29 citations
23. 23*

    Charged Higgs Phenomenology in di-bjet channel with $H^{\pm }\to W^{\pm }h$ in 2HDM Type-II using Machine Learning Technique

    Kanhaiya Gupta🇩🇪

    The latest LHC collaborations results on ${\sigma }_{H^{\pm }}BR(H^{\pm }\to {\tau }^{\pm }\nu )$ and ${\sigma }_{H^{\pm }}BR(H^{+}\to t\bar{b})$ are used to impose constraints on the charged Higgs $H^{\pm }$ parameters within the Two Higgs Doublet Model (2HDM). But it leaves $1.5\le tan\beta \le 3$ window unexplored where the $BR(H^{\pm }\to W^{\pm }h)$ becomes sizable for $m_{H^{\pm }}>m_t$. In this manuscript $H^{\pm }\to W^{\pm }h$ is investigated with neutral Higgs boson decaying to a pair of b-quarks and the discovery prospects of charged Higgs boson is discussed. In particular, the analysis is optimized by putting the kinematic cuts and prospects of using Machine Learning Technique to derive values of $\sigma \times BR$ needed for a $5\sigma$ discovery at the LHC.

    hep-ph0 citations
24. 24*

    Exploring New Physics in $D_{(s)}^{+}\to {\eta }^{(\prime )}\bar{\ell }{\nu }_{\ell }$ Decays

    Karthik Jain🇮🇳 · Barilang Mawlong🇮🇳

    The observation of anomalies in the charged current $b\to c\bar{\ell }{\nu }_{\ell }$ transitions hints the possibility of the existence of new physics beyond the standard model. Inspired by the work done in the beauty quark sector, we explore new physics in the charm quark sector with $c\to (s,d)\bar{\ell }{\nu }_{\ell }$ charged current transitions. We analyze the decay modes $D_{(s)}^{+}\to {\eta }^{{(}^{\prime })}\bar{\ell }{\nu }_{\ell }$ within an effective Lagrangian framework which includes both standard model and new physics contributions. We use the available experimental measurements of the semileptonic $D$ meson decays to constrain the parameter space of new physics couplings. We then investigate the effects of new physics on four linearly independent observables, the branching fraction, forward-backward asymmetry, lepton polarization and convexity parameter.

    hep-ph1 citation
25. 25*

    Flavour Physics Phenomenology with SuperIso

    S. Neshatpour🇮🇹 · F. Mahmoudi🇫🇷

    We present an overview of SuperIso v4.1 which is a public program for the calculation of flavour physics observables. We give examples of using SuperIso to constrain new physics scenarios with kaon physics and present the implications of rare B-decays.

    hep-phPoS(2022)·25 citations
26. 26*

    Direct detection of pseudo-Nambu-Goldstone dark matter in a two Higgs doublet plus singlet extension of the SM

    Thomas Biekötter🇩🇪 · Pedro Gabriel🇵🇹 · María Olalla Olea-Romacho🇩🇪 · Rui Santos🇵🇹

    We calculate the leading radiative corrections to the dark-matter-nucleon scattering in the pseudo-Nambu-Goldstone dark matter model augmented with a second Higgs doublet (S2HDM). In this model, the cross sections for the scattering of the dark-matter on nuclei vanishes at tree-level in the limit of zero momentum-transfer due to a U(1) symmetry. However, this symmetry is softly broken in order to give a mass to the dark-matter particle. As a consequence, non-vanishing scattering cross sections arise at the loop level. We find that the current cross-section limits from dark-matter direct-detection experiments can hardly constrain the parameter space of the S2HDM. However, the loop-corrected predictions for the scattering cross sections can be well within the reach of future direct-detection experiments. As a consequence, future phenomenological analyses of the S2HDM should take into account cross-section predictions beyond tree-level and the experimental constraints from dark-matter direct-detection experiments.

    hep-phJHEP(2022)·20 citations
27. 27*

    Emergence of mass in the gauge sector of QCD

    J. Papavassiliou🇪🇸

    It is widely accepted nowadays that gluons, while massless at the level of the fundamental QCD Lagrangian,acquire an effective mass through the non-Abelian implementation of the classic Schwinger mechanism. The key dynamical ingredient that triggers the onset of this mechanism is the formation of composite massless poles inside the fundamental vertices of the theory. These poles enter in the evolution equation of the gluon propagator, and affect nontrivially the way the Slavnov-Taylor identities of the vertices are resolved,inducing a smoking-gun displacement in the corresponding Ward identities. In this article we present a comprehensive review of the pivotal concepts associated with this dynamical scenario, emphasizing the synergy between functional methods and lattice simulations, and highlighting recent advances that corroborate the action of the Schwinger mechanism in QCD.

    hep-phhep-lathep-thnucl-thCPC(2022)·52 citations
28. 28*

    Mueller-Navelet jets at the LHC: hunting data with azimuthal distributions

    Francesco Giovanni Celiberto🇮🇹 · Alessandro Papa🇮🇹

    By making use of the hybrid collinear and high-energy factorization, where the BFKL resummation of leading and next-to-leading energy logarithms is combined with the standard description in terms of collinear parton densities, we compare predictions for Mueller-Navelet jet rapidity and angular differential rates with data collected by CMS at $\sqrt{s}=7$ TeV. We provide an evidence that the study of azimuthal distributions, calculated as a Fourier sum of correlation moments and embodying the high-energy signal coming from all conformal-spin modes, permits us to overcome the well-known issues emerging in the description of Mueller-Navelet final states at natural values of the renormalization scale. We come out with a clear indication that the next-to-leading BFKL description of these observables at natural scales is valid when the rapidity interval between the two jets is large, and it allows us to catch the core high-energy dynamics emerging from data.

    hep-phPRD(2022)·54 citations
29. 29*

    Numerators in Parametric Representations of Feynman Diagrams

    Marc P. Bellon🇫🇷

    The parametric representation has been used since a long time for the evaluation of Feynman diagrams. As a dimension independent intermediate representation, it allows a clear description of singularities. Recently, it has become a choice tool for the investigation of the type of transcendent numbersappearing in the evaluation of Feynman diagrams. The inclusion of numerators has however stagnated since the ground work of Nakanishi. I here show howto greatly simplify the formulas through the use of Dodgson identities. In the massless case in particular, reduction to the completion to a vacuum graph allows for a strong reduction of the maximal power of the Symanzik polynomial in the denominator.

    hep-phhep-thmath-phmath.MPSIGMA(2025)·2 citations
30. 30*

    Resummation of the $\alpha$ expansion for nonlinear pair production

    Greger Torgrimsson🇸🇪

    We show how to resum the Furry-picture $\alpha$ expansion in order to take quantum radiation reaction and spin transition into account in the nonlinear trident process in (pulsed) plane-wave background fields. The results are therefore nontrivial functions of both the background field strength, $eE$, and the coupling to the quantized photon field, $\alpha =e^2/4\pi$. The effective expansion parameter, $T$, is $\alpha$ times $eE/m\omega \gg 1$, which makes higher orders important. We show that they can change the sign of the spin dependent part already at $T<1$, which will be experimentally accessible.

    hep-phhep-thPRD(2023)·13 citations
31. 31*

    New constraint on neutrino magnetic moment and neutrino millicharge from LUX-ZEPLIN dark matter search results

    M. Atzori Corona🇮🇹 · W. M. Bonivento🇮🇹 · M. Cadeddu🇮🇹 · N. Cargioli🇮🇹 · F. Dordei🇮🇹

    Elastic neutrino-electron scattering represents a powerful tool to investigate key neutrino properties. In view of the recent results released by the LUX-ZEPLIN collaboration, we provide a first determination of the limits achievable on the neutrino magnetic moment and neutrino millicharge, whose effect becomes non-negligible in some beyond the Standard Model theories. In this context, we evaluate and discuss the impact of different approximations to describe the neutrino interaction with atomic electrons. The new LUX-ZEPLIN data allows us to set a very competitive limit on the neutrino magnetic moment when compared to the other laboratory bounds, namely ${\mu }_{\nu }^{\mathrm{eff}}<1.1\times 10^{-11}{\mu }_{\text{B}}$ at 90$\%$ C.L., which improves by a factor of 2.5 the Borexino collaboration limit and represents the second best world limit after the recent XENONnT result. Moreover, exploiting the so-called equivalent photon approximation, we obtain the most stringent limit on the neutrino millicharge, namely $|q_{\nu }^{\mathrm{eff}}|<1.5\times 10^{-13}{e}_0$ at 90$\%$ C.L., which represents a great improvement with respect to the previous laboratory bounds.

    hep-phhep-exPRD(2023)·62 citations
32. 32*

    The Role of Vector Boson Fusion in the Production of Heavy Vector Triplets at the LHC and HL-LHC

    Michael J. Baker🇦🇺 · Timothy Martonhelyi🇦🇺 · Andrea Thamm🇦🇺 · Riccardo Torre🇮🇹

    We clarify the role of vector boson fusion (VBF) in the production of heavy vector triplets at the LHC and the HL-LHC. We point out that the presence of VBF production leads to an unavoidable rate of Drell-Yan (DY) production and highlight the subtle interplay between the falling parton luminosities and the increasing importance of VBF production as the heavy vector mass increases. We discuss current LHC searches and HL-LHC projections in di-boson and di-lepton final states and demonstrate that VBF production outperforms DY production for resonance masses above 1 TeV in certain regions of the parameter space. We define two benchmark parameter points which provide competitive production rates in vector boson fusion.

    hep-phhep-exJHEP(2022)·6 citations
33. 33*

    Chern-Simons Gravity and Neutrino Self-Interactions

    Stephon Alexander🇺🇸 · Cyril Creque-Sarbinowski🇺🇸

    Dynamical Chern-Simons gravity (dCS) is a four-dimensional parity-violating extension of general relativity. Current models predict the effect of this extension to be negligible due to large decay constants $f$ close to the scale of grand unified theories. Here, we present a construction of dCS allowing for much smaller decay constants, ranging from sub-eV to Planck scales. Specifically, we show that if there exists a fermion species with strong self-interactions, the short-wavelength fermion modes form a bound state. This bound state can then undergo dynamical symmetry breaking and the resulting pseudoscalar develops Yukawa interactions with the remaining long-wavelength fermion modes. Due to this new interaction, loop corrections with gravitons then realize a linear coupling between the pseudoscalar and the gravitational Chern-Simons term. The strength of this coupling is set by the Yukawa coupling constant divided by the fermion mass. Therefore, since self-interacting fermions with small masses are ideal, we identify neutrinos as promising candidates. For example, if a neutrino has a mass $m_{\nu }\lesssim \mathrm{meV}$ and the Yukawa coupling is order unity, the dCS decay constant can be as small as $f\sim 10^3{m}_{\nu }\lesssim \mathrm{eV}$. We discuss other potential choices for fermions.

    hep-phgr-qcPRD(2023)·20 citations
34. 34*

    Hot and heavy dark matter from a weak scale phase transition

    Iason Baldes🇧🇪 · Yann Gouttenoire🇮🇱 · Filippo Sala🇫🇷

    We point out that dark matter which is produced non-adiabatically in a phase transition (PT) with fast bubble walls receives a boost in velocity which leads to long free-streaming lengths. We find that this could be observed via the suppressed matter power spectrum for dark matter masses around $10^8-10^9$ GeV and energy scales of the PT around $10^2-10^3$ GeV. The PT should take place at the border of the supercooled regime, i.e. approximately when the Universe becomes vacuum dominated. This work offers novel physics goals for galaxy surveys, Lyman-$\alpha$, stellar stream, lensing, and 21-cm observations, and connects these to the gravitational waves from such phase transitions, and more speculatively to possible telescope signals of heavy dark matter decay.

    hep-phastro-ph.COSciPost Phys.(2023)·64 citations
35. 35*

    Searching for a Single Photon from Lightest Neutralino Decays in R-parity-violating Supersymmetry at FASER

    Herbi K. Dreiner🇩🇪 · Dominik Köhler🇩🇪 · Saurabh Nangia🇩🇪 · Zeren Simon Wang🇹🇼

    In this work, we propose a search for a single photon at \texttt{FASER} and \texttt{FASER2}, produced from decays of bino-like, sub-GeV lightest neutralinos in the theoretical framework of the R-parity-violating (RPV) Minimal Supersymmetric Standard Model (MSSM). We consider a list of representative benchmark scenarios with one or two non-vanishing RPV couplings. The photon has an energy $\mathcal{O}\left(0.1\right)-\mathcal{O}\left(1\right)$ TeV. We find a sensitivity reach for RPV couplings beyond the current bounds by orders of magnitude at \texttt{FASER} and \texttt{FASER2}.

    hep-phhep-exJHEP(2023)·28 citations
36. 36*

    A Grand Scan of the pMSSM Parameter Space for Snowmass 2021

    Jennet Dickinson🇺🇸 · Samuel Bein🇩🇪 · Sven Heinemeyer🇪🇸 · Joshua Hiltbrand🇺🇸 · Jim Hirschauer🇺🇸 · Walter Hopkins🇺🇸 · Elliot Lipeles🇺🇸 · Malte Mrowietz🇩🇪 · Nadja Strobbe🇺🇸

    We present a flexible framework for interpretation of SUSY sensitivity studies for future colliders in terms of the phenomenological minimal supersymmetric standard model (pMSSM). We perform a grand scan of the pMSSM 19-dimensional parameter space that covers the accessible ranges of many collider scenarios, including electron, muon, and hadron colliders at a variety of center of mass energies. This enables comparisons of sensitivity and complementarity across different future experiments, including both colliders and precision measurements in the Cosmological and Rare Frontiers. The details of the scan framework are discussed, and the impact of future precision measurements on Higgs couplings, the anomalous muon magnetic moment, and dark matter quantities is presented. The next steps for this ongoing effort include performing studies with simulated events in order to quantitatively assess the sensitivity of selected future colliders in the context of the pMSSM.

    hep-ph7 citations
37. 37*

    Fermiophobic light Higgs boson in the type-I two-Higgs-doublet model

    Jinheung Kim🇰🇷 · Soojin Lee🇰🇷 · Prasenjit Sanyal🇰🇷 · Jeonghyeon Song🇰🇷

    The null results in the new physics searches at the LHC do not exclude an intermediate-mass new particle if it is fermiophobic. Type-I in the two-Higgs-doublet model accommodates a fermiophobic light Higgs boson $h_{\mathrm{f}}$ if $\alpha =\pi /2$. The heavier $CP$-even Higgs boson explains the observed Higgs boson at a mass of 125 GeV. We first obtain the still-valid parameter space satisfying the theoretical requirements, flavor-changing neutral currents in $B$ physics, the cutoff scale above 1 TeV, Higgs precision data, and the direct collider search bounds at high energy colliders. We also study the high energy scale behavior via the analysis of the renormalization group equations. An important result is that the fermiophobic type-I can maintain the stability of the scalar potential all the way up to the Planck scale if $m_{h_{\mathrm{f}}}$ is larger than half the observed Higgs boson mass. Since the parameter space is severely curtailed, especially for the high cutoff scale, the signal rates in the multi-photon states of new Higgs bosons at the LHC are well predicted. We suggest the processes of $4\gamma +V{V}^{\prime }$ ($V^{(\prime )}=Z,W^{\pm }$) as the golden discovery channels for the model since they enjoy an almost background-free environment and substantial selection efficiencies for four photons.

    hep-phhep-exPLB(2022)·15 citations
38. 38*

    Right-handed neutrinos, domain walls and tadpoles in the superstring inspired $\mu \nu$SSM

    D. E. Lopez-Fogliani🇦🇷 · C. Munoz🇪🇸

    We discuss the special role of right-handed neutrinos in the $\mu \nu$SSM for solving the $\mu$- and $\nu$-problems, simultaneously avoiding the potential domain wall and tadpole problems, In particular, embedding the $\mu \nu$SSM in the framework of superstrings implies that not all gauge invariant terms are necessarily present in the superpotential, and thus there is more flexibility to allow only those that avoid the domain wall and tadpole problems to be present. These can be non-renormalizable terms of dimension 4 or terms of higher dimensions. In addition, non-perturbative effects can also solve both problems. We discuss another implication of the superstring inspired $\mu \nu$SSM, since the right-handed neutrino is expected to have extra $U(1)$ charges at high energies. In this case, the cubic right-handed neutrino terms in the superpotential, helpful for generating Majorana masses and solving domain wall and tadpole problems, can arise through a variety of stringy mechanisms.

    hep-phhep-thNPB(2023)·1 citation
39. 39*

    Critical lensing and kurtosis near a critical point in the QCD phase diagram in and out-of-equilibrium

    Travis Dore🇺🇸 · Jamie M. Karthein🇺🇸 · Isaac Long🇺🇸 · Debora Mroczek🇺🇸 · Jacquelyn Noronha-Hostler🇺🇸 · Paolo Parotto🇩🇪 · Claudia Ratti🇺🇸 · Yukari Yamauchi🇺🇸

    In this work, we study the lensing effect of the QCD critical point on hydrodynamic trajectories, and its consequences on the net-proton kurtosis ${\kappa }_4$. Including critical behavior by means of the BEST Collaboration equation of state (EoS), we first consider a scenario in equilibrium, then compare with hydrodynamic 0+1D simulations with Bjorken expansion, including both shear and bulk viscous terms. We find that, both in and out-of-equilibrium, the size and shape of the critical region directly affect if the signal will survive through the dynamical evolution.

    ↳ nucl-thhep-exhep-phPRD(2022)·43 citations
40. 40*

    Einstein-Yang-Mills-aether theory with nonlinear axion field: Decay of color aether and the axionic dark matter production

    Alexander B. Balakin🇷🇺 · Gleb B. Kiselev🇷🇺

    We establish a nonlinear version of the SU(N) symmetric theory, which describes self-consistently the interaction between the gravitational, gauge, vector and pseudoscalar (axion) fields. In the context of this theory the SU(N) symmetric multiplet of vector fields is associated with the color aether, the decay of which in the early Universe produced the canonic dynamic aether and the axionic dark matter. The SU(N) symmetric Yang-Mills field, associated with the color aether, forms the source, which transfers the energy of the decaying color aether to the axion field. The nonlinear modification of the model uses explicitly the requirement of discrete symmetry, prescribed by the axion field, and is based on the analogy with nonlinear physical pendulum. We show that in the framework of this nonlinear regular model the axion field can grow to an arbitrarily large value, thus explaining the abundance of the axionic dark matter in the Universe.

    ↳ gr-qchep-phhep-thSymmetry(2022)·6 citations
41. 41*

    Lorentz-violating electrodynamics in continuous matter

    Manoel M. Ferreira Jr.🇧🇷 · Pedro D. S. Silva🇧🇷 · Marco Schreck🇧🇷

    We review the propagation of electromagnetic waves in continuous matter in the presence of Lorentz-violating terms. First, we briefly discuss classical electrodynamics with regard to optical properties of a dielectric medium exhibiting the Chiral Magnetic Effect (CME). Such a medium can be modeled by Maxwell-Carroll-Field-Jackiw (MCFJ) theory. Second, we describe the impact of CPT-odd terms of mass dimensions three and five, respectively, on electromagnetic propagation in continuous matter. Birefringence and absorption are analyzed in the scenarios investigated. Our findings provide new insights into the interplay between classical field theory and optical effects in matter.

    ↳ hep-thhep-ph0 citations
42. 42*

    Stability of neutron stars in Horndeski theories with Gauss-Bonnet couplings

    Masato Minamitsuji🇵🇹 · Shinji Tsujikawa🇯🇵

    In Horndeski theories containing a scalar coupling with the Gauss-Bonnet (GB) curvature invariant $R_{\mathrm{GB}}^2$, we study the existence and linear stability of neutron star (NS) solutions on a static and spherically symmetric background. For a scalar-GB coupling of the form $\alpha \xi (\varphi )R_{\mathrm{GB}}^2$, where $\xi$ is a function of the scalar field $\varphi$, the existence of linearly stable stars with a nontrivial scalar profile without instabilities puts an upper bound on the strength of the dimensionless coupling constant $|\alpha |$. To realize maximum masses of NSs for a linear (or dilatonic) GB coupling ${\alpha }_{\mathrm{GB}}\varphi R_{\mathrm{GB}}^2$ with typical nuclear equations of state, we obtain the theoretical upper limit $\sqrt{|{\alpha }_{\mathrm{GB}}|}<0.7\mathrm{km}$. This is tighter than those obtained by the observations of gravitational waves emitted from binaries containing NSs. We also incorporate cubic-order scalar derivative interactions, quartic derivative couplings with nonminimal couplings to a Ricci scalar besides the scalar-GB coupling and show that NS solutions with a nontrivial scalar profile satisfying all the linear stability conditions are present for certain ranges of the coupling constants. In regularized 4-dimensional Einstein-GB gravity obtained from a Kaluza-Klein reduction with an appropriate rescaling of the GB coupling constant, we find that NSs in this theory suffer from a strong coupling problem as well as Laplacian instability of even-parity perturbations. We also study NS solutions with a nontrivial scalar profile in power-law $F(R_{\mathrm{GB}}^2)$ models, and show that they are pathological in the interior of stars and plagued by ghost instability together with the asymptotic strong coupling problem in the exterior of stars.

    ↳ gr-qchep-phhep-thPRD(2022)·16 citations
43. 43*

    Measuring differential flow angle fluctuations in relativistic nuclear collisions

    Niseem Magdy🇺🇸

    Recently studies of the differential nature of the flow angle fluctuations, known as event plane angular decorrelation, indicated that measurements that assume a common symmetry plane may need to consider the flow angle fluctuations effect. Using the HIJING and AMPT models, it is shown that the flow angle fluctuations measurements, obtained with the two- and three-subevents correlation method, could have significant non-flow effects associated with long- and short-range non-flow correlations. The current study demonstrates the four-subevents cumulant methods' ability to reduce the non-flow effects. It is further argued that the measurements using the four-subevents correlation method can be used to provide accurate quantification of the differential flow angle fluctuations.

    ↳ nucl-thhep-exhep-phnucl-exPRC(2022)·10 citations
44. 44*

    Long-Exposure NuSTAR Constraints on Decaying Dark Matter in the Galactic Halo

    Brandon M. Roach🇺🇸 · Steven Rossland🇺🇸 · Kenny C. Y. Ng🇨🇳 · Kerstin Perez🇺🇸 · John F. Beacom🇺🇸 · Brian W. Grefenstette🇺🇸 · Shunsaku Horiuchi🇺🇸 · Roman Krivonos🇷🇺 · Daniel R. Wik🇺🇸

    We present two complementary NuSTAR x-ray searches for keV-scale dark matter decaying to mono-energetic photons in the Milky Way halo. In the first, we utilize the known intensity pattern of unfocused stray light across the detector planes -- the dominant source of photons from diffuse sources -- to separate astrophysical emission from internal instrument backgrounds using $\sim$7-Ms/detector deep blank-sky exposures. In the second, we present an updated parametric model of the full NuSTAR instrument background, allowing us to leverage the statistical power of an independent $\sim$20-Ms/detector stacked exposures spread across the sky. Finding no evidence of anomalous x-ray lines using either method, we set limits on the active-sterile mixing angle ${\sin }^2(2\theta )$ for sterile-neutrino masses 6--40 keV. The first key result is that we strongly disfavor a $\sim$7-keV sterile neutrino decaying into a 3.5-keV photon. The second is that we derive leading limits on sterile neutrinos with masses $\sim$15--18 keV and $\sim$25--40 keV, reaching or extending below the Big Bang Nucleosynthesis limit. In combination with previous results, the parameter space for the Neutrino Minimal Standard Model ($\nu$MSM) is now nearly closed.

    ↳ astro-ph.HEhep-phPRD(2023)·138 citations
45. 45*

    ${}^7$H ground state as a ${}^3$H+4n resonance

    Emiko Hiyama🇯🇵 · Rimantas Lazauskas🇫🇷 · Jaume Carbonell🇫🇷

    We have investigated the possible existence of a ${}^7$H resonant state, considered as a five-body system consisting of a ${}^3$H core with four valence neutrons. To this aim, an effective n-${}^3$H potential is constructed in order to reproduce the low energy elastic neutron scattering on ${}^3$H phase shifts and the ${}^5$H resonant ground state in terms of ${}^3$H-n-n system. The variational Gaussian Expansion Method is used to solve the 5-body Schrödinger equation, while the resonant state parameters were estimated by means of the stabilization method. We have not found any sign of a narrow low energy resonance in the vicinity of ${}^3$H+4n threshold. However, we have identified a very broad structure at $E_R\approx 9$ MeV above this threshold, which corresponds to the ${}^7$H J${}^{\pi }$=1/2${}^{+}$ ground state. In the vicinity of this state, we have also identified a broad structure corresponding to the ground state of ${}^6$H isotope with quantum numbers $J^{\pi }=2^{-}$.

    ↳ nucl-thhep-phnucl-exPLB(2022)·7 citations
46. 46*

    $1^{-+}$ Hybrid in $J/\psi$ Radiative Decays from Lattice QCD

    Feiyu Chen🇨🇳 · Xiangyu Jiang🇨🇳 · Ying Chen🇨🇳 · Ming Gong🇨🇳 · Zhaofeng Liu🇨🇳 · Chunjiang Shi🇨🇳 · Wei Sun🇨🇳

    We present the first theoretical prediction of the production rate of $1^{-+}$ light hybrid meson ${\eta }_1$ in $J/\psi$ radiative decays. In the $N_f=2$ lattice QCD formalism with the pion mass $m_{\pi }\approx 350$ MeV, the related electromagnetic multipole form factors are extracted from the three-point functions that involve necessarily quark annihilation diagrams, which are calculated through the distillation method. The partial width of $J/\psi \to \gamma {\eta }_1$ is determined to be $2.29(77)\mathrm{eV}$ at the ${\eta }_1$ mass $m_{{\eta }_1}=2.23(4)$ GeV. If ${\eta }_1$ corresponds to the recently observed ${\eta }_1(1855)$ in the process $J/\psi \to \gamma {\eta }_1(1855)\to \gamma \eta {\eta }^{\prime }$ by BESIII, then the branching fraction $\mathrm{Br}(J/\psi \to \gamma {\eta }_1(1855))$ is estimated to be $6.2(2.2)\times 10^{-5}$, which implies $\mathrm{Br}({\eta }_1(1855)\to \eta {\eta }^{\prime })\sim 4.3\%$.

    ↳ hep-lathep-exhep-phPRD(2023)·36 citations
47. 47*

    Windows on the hadronic vacuum polarisation contribution to the muon anomalous magnetic moment

    C.T.H.Davies🇬🇧 · C.DeTar🇺🇸 · A.X.El-Khadra🇺🇸 · Steven Gottlieb🇺🇸 · D. Hatton🇬🇧 · A.S. Kronfeld🇺🇸 · S. Lahert🇺🇸 · G.P. Lepage🇺🇸 · C. McNeile🇬🇧 · E.T. Neil🇺🇸 · C.T. Peterson🇺🇸 · G.S. Ray🇬🇧 · R.S. Van de Water🇺🇸 · A. Vaquero🇺🇸

    An accurate determination of the leading-order hadronic vacuum polarisation (HVP) contribution to the anomalous magnetic moment of the muon is critical to understanding the size and significance of any discrepancy between the Standard Model prediction and experimental results being obtained by the Muon g-2 experiment at Fermilab. The Standard Model prediction is currently based on a data-driven approach to the HVP using experimental results for $\sigma (e^{+}{e}^{-}\to \mathrm{hadrons})$. Lattice QCD aims to provide a result with similar uncertainty from calculated vector-vector correlation functions, but the growth of statistical and systematic errors in the $u/d$ quark correlation functions at large Euclidean time has made this difficult to achieve. We show that restricting the lattice contributions to a one-sided window $0<t<t_1$ can greatly improve lattice results while still capturing a large fraction of the total HVP. We illustrate this by comparing windowed lattice results based on the 2019 Fermilab Lattice/HPQCD/MILC HVP analysis with corresponding results obtained from the KNT19 analysis of $R_{e^{+}{e}^{-}}$ data. For $t_1=1.5$ fm, 70% of the total HVP is contained within the window and our lattice result has an error of~0.7%, only about twice as big as the error from the $e^{+}{e}^{-}$~analysis. We see a tension of 2.7$\sigma$ between the two results. With increased statistics in the lattice data the one-sided windows will allow stringent tests of lattice and $R_{e^{+}{e}^{-}}$ results that include a large fraction of the total HVP contribution.

    ↳ hep-lathep-phPRD(2022)·48 citations
48. 48*

    On Inflation and Reheating Features in the Higgs-$R^2$ Model

    Norma Sidik Risdianto🇮🇩

    We investigated inflation in the Higgs-$R^2$ model and assumed the trajectory to follow a single-field approximation called minimal two-field mode. Using this approximation, we tried to constrain the Higgs' non-minimal coupling $\xi$. During inflation, we investigated the effect of $\xi$ on the non-gaussianity. We found that $\xi$ could not provide the large non-gaussianity. In this paper, we divided the preheating stage to be quadratic regime and quartic regime. During the quadratic regime, the gauge bosons' production is the most dominant. However, it could not drain the whole inflaton's energy. Thus, we introduced a dark matter candidate with a large coupling that could drain the whole inflaton's energy. We also found that if $\xi <4.2$, the oscillation on the quadratic regime continued to the quartic regime. The reheating temperature obtained by this mode can be reached to be $\sim 10^{10}$ GeV and strongly depends on the remaining inflaton's energy density. On contrary, if $\xi >4.2$, the oscillation only happens at the quadratic regime. As we assumed the Pauli exclusion principle does exist during the quadratic regime, the instant decay of gauge bosons to fermions is restricted. Hence we expected, the reheating temperature to be low for about $\sim 10^9$ GeV.

    ↳ astro-ph.COhep-phNPB(2025)·2 citations
49. 49*

    Splitting of proton-antiproton directed flow in relativistic heavy-ion collisions

    Piotr Bozek🇵🇱

    The rapidity dependent directed flow of particles produced in a relativistic heavy ion collision can be generated in the hydrodynamic expansion of a tilted source. The asymmetry of the pressure leads to a build up of a directed flow of matter with respect to the collision axis. The experimentally observed ordering of the directed flow of baryons, pions and antibaryons can be described as resulting from the expansion of a baryon inhomogeneous fireball. An uneven distribution of baryons in the transverse plane leads to an asymmetry in the collective push for protons and antiprotons. Precise measurements of the collective flow as a function of rapidity could serve as a strong constraint on mechanism of baryon stopping in the early phase of the collision.

    ↳ nucl-thhep-phnucl-exPRC(2022)·31 citations
50. 50*

    Three loop effective potential for $⟨\frac{1}{2}{A_{\mu }^a}^2⟩$ in the Landau gauge in QCD

    J.A. Gracey🇬🇧

    We apply the Local Composite Operator method to construct the three loop effective potential for the dimension two operator $\frac{1}{2}{A_{\mu }^a}^2$ in the Landau gauge in Quantum Chromodynamics. For $SU(3)$ we show that the three loop value of the effective mass of the gluon is similar to the two loop estimates when the number of massless quarks is strictly less than five for $SU(3)$.

    ↳ hep-thhep-phPRD(2022)·1 citation
51. 51*

    Quantum energies of BPS vortices in $D=2+1$ and $D=3+1$

    N. Graham🇺🇸 · H. Weigel🇿🇦

    We consider vortices in scalar electrodynamics and compute the leading quantum correction to their energies for the BPS case of identical classical masses of the Higgs and gauge fields. In particular, we focus on the winding number $n$ dependence of these corrections, from which we can extract the binding energies of configurations with larger $n$. For both dimensionalities, $D=2+1$ and $D=3+1$, we find that quantum corrections are negative and scale approximately linearly with $n$, so that combined vortices are favored over isolated ones.

    ↳ hep-thcond-mat.supr-conhep-phPRD(2022)·5 citations
52. 52*

    Rebuttal to: "Comment on Scaling properties of background- and chiral-magnetically-driven charge separation in heavy ion collisions at ${\sqrt{s}}_{\mathrm{NN}}=200$ GeV"

    Roy A. Lacey🇺🇸 · Niseem Magdy (Depts. of Chemistry and Physics, Stony Brook University, Stony Brook, New York, USA)🇺🇸

    Recently, F. Wang commented on our work "Scaling properties of background- and chiral-magnetically-driven charge separation in heavy ion collisions at ${\sqrt{s}}_{\mathrm{NN}}=200$ GeV" and made several claims to support his conclusion that our results are fallacious. His conclusion and claims are not only incorrect; they show a fundamental disconnect with the rudiments of the $R_{{\Psi }_2}(\Delta S)$ correlator. This rebuttal addresses the root misconception responsible for Wang's false claims.

    ↳ nucl-exhep-exhep-phnucl-th0 citations
53. 53*

    Magnetogenesis in Higgs-Starobinsky inflation

    R. Durrer🇨🇭 · O. Sobol🇨🇭 · S. Vilchinskii🇺🇦

    In the framework of mixed Higgs-Starobinsky inflation, we consider the generation of Abelian gauge fields due to their nonminimal coupling to gravity (in two different formulations of gravity -- metric and Palatini). We couple the gauge-field invariants $F_{\mu \nu }{F}^{\mu \nu }$ and $F_{\mu \nu }{\tilde{F}}^{\mu \nu }$ to an integer power of the scalar curvature $R^n$ in Jordan frame and, treating these interactions perturbatively, switch to the Einstein frame where they lead to effective kinetic and axial couplings between gauge fields and inflaton. We determine the power spectra, energy densities, correlation length, and helicality of the generated gauge fields for different values of the nonminimal coupling constants and parameter $n$. We analytically estimate the spectral index $n_B$ of the magnetic power spectrum and show that for $n>1$ it is possible to get the scale-invariant or even red-tilted spectrum for a wide range of modes that implies larger correlation length of the generated fields. On the other hand, the magnitude of these fields typically decreases in time becoming very small in the end of inflation. Thus, it is difficult to obtain both large magnitude and correlation length of the gauge field in the frame of this model.

    ↳ gr-qcastro-ph.COhep-phPRD(2022)·28 citations
54. 54*

    Stability analysis of non-Abelian electric fields

    Jude Pereira🇺🇸 · Tanmay Vachaspati🇺🇸

    We study the stability of fluctuations around a homogeneous non-Abelian electric field background that is of a form that is protected from Schwinger pair production. Our analysis identifies the unstable modes and we find a limiting set of parameters for which there are no instabilities. We discuss potential implications of our analysis for confining strings in non-Abelian gauge theories.

    ↳ hep-thhep-lathep-phPRD(2022)·8 citations
55. 55*

    Experimental measurement of infinite dilution thermal neutron self-shielding factor

    Ateia W. Mahmoud🇪🇬 · Elsayed K. Elmaghraby🇪🇬 · E. Salama🇪🇬 · A. Elghazaly🇪🇬 · S. A. El-fiki🇪🇬

    The absorption of neutrons in media together with its transport properties cause the neutron flux to decrease as it penetrates the material because the absorption of neutrons in the sample itself attenuates the neutrons flux as it goes deeper into the sample. In the present work, the thermal neutron self-shielding factors of indium, gold, zinc, and mercury were determined experimentally. The current results together with those found in the literature were used to validate a mathematical ab initio formulae based on integral cross-section parameters used to compare our results. The complete agreement among these species of data suggests the validity of correlating the neutron migration length in the convex-shaped material with the average chord length described in the mathematical model.

    ↳ cond-mat.mtrl-scihep-phBraz.J.Phys.(2022)·1 citation

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.