Wed·Jan 12, 2022Wednesday·January 12, 2022

1. 01*

   Thermal-model-based characterization of heavy-ion-collision systems at chemical freeze-out

   Jamie M. Karthein🇺🇸 · Paolo Alba🇩🇪 · Valentina Mantovani-Sarti🇩🇪 · Jacquelyn Noronha-Hostler🇺🇸 · Paolo Parotto🇩🇪 · Israel Portillo-Vazquez🇺🇸 · Volodymyr Vovchenko🇺🇸 · Volker Koch🇺🇸 · Claudia Ratti🇺🇸

   We investigate the chemical freeze-out in heavy-ion collisions (HICs) and the impact of the hadronic spectrum on thermal model analyses. Detailed knowledge of the hadronic spectrum is still an open question, which has phenomenological consequences on the study of HICs. By varying the number of resonances included in Hadron Resonance Gas (HRG) Model calculations, we can shed light on which particles may be produced. Furthermore, we study the influence of the number of states on the so-called two flavor freeze-out scenario, in which strange and light particles can freeze-out separately. We consider results for the chemical freeze-out parameters obtained from thermal model fits and from calculating net-particle fluctuations. We will show the effect of using one global temperature to fit all particles and alternatively, allowing particles with and without strange quarks to freeze-out separately.

   hep-phhep-thEPJ Web Conf.(2022)·3 citations
2. 02*

   TtW at NLO in QCD: Full off-shell effects and precision observables

   Jasmina Nasufi🇩🇪

   In light of recent tension between theory and experiment for the process ttW in the 3l channel, we present a phenomenological study of carefully chosen observables. We employ the full off-shell results at NLO QCD for ttW+ and ttW- to build the cross section ratio, an observable which is expected to exhibit enhanced perturbative stability. Furthermore, we also revisit the charge asymmetries of the top and its decay products at the fiducial integrated level. The impact of modelling is investigated for all observables.

   hep-ph1 citation
3. 03*

   Deeply virtual Compton scattering cross section at high Bjorken $x_B$

   F. Georges🇫🇷 · M.N.H. Rashad🇺🇸 · A. Stefanko🇺🇸 · M. Dlamini🇺🇸 · B. Karki🇺🇸 · S.F. Ali🇺🇸 · P-J. Lin🇺🇸 · H-S Ko🇫🇷 · N. Israel🇺🇸 · D. Adikaram🇺🇸 · Z. Ahmed🇨🇦 · H. Albataineh🇺🇸 and 150 other authors

   We report high-precision measurements of the Deeply Virtual Compton Scattering (DVCS) cross section at high values of the Bjorken variable $x_B$. DVCS is sensitive to the Generalized Parton Distributions of the nucleon, which provide a three-dimensional description of its internal constituents. Using the exact analytic expression of the DVCS cross section for all possible polarization states of the initial and final electron and nucleon, and final state photon, we present the first experimental extraction of all four helicity-conserving Compton Form Factors (CFFs) of the nucleon as a function of $x_B$, while systematically including helicity flip amplitudes. In particular, the high accuracy of the present data demonstrates sensitivity to some very poorly known CFFs.

   hep-phhep-exnucl-exPRL(2022)·63 citations
4. 04*

   Lepton flavor violating $Z$ and Higgs decays in the scotogenic model

   Raghavendra Srikanth Hundi🇮🇳

   In this work, we have studied lepton flavor violating (LFV) decays of $Z$ gauge boson and Higgs boson ($H$) in the scotogenic model. We have computed branching ratios for the decays $Z\to {\ell }_{\alpha }{\ell }_{\beta }$ and $H\to {\ell }_{\alpha }{\ell }_{\beta }$ in this model. Here, ${\ell }_{\alpha }$ and ${\ell }_{\beta }$ are different charged lepton fields. After fitting to the neutrino oscillation observables in the scotogenic model, we have found that the branching ratios for the LFV decays of $Z$ and $H$ can be as large as $\sim 10^{-8}$ and $\sim 10^{-3}$ respectively. However, after satisfying the constraints due to non-observation of ${\ell }_{\alpha }\to {\ell }_{\beta }\gamma$ decays, the above mentioned branching ratio results are found to be suppressed by a factor of $\sim 10^{-7}$.

   hep-phEPJC(2022)·13 citations
5. 05*

   Semileptonic Decay of ${\Xi }_c\to \Xi {\ell }^{+}{\nu }_{\ell }$ From Light-Cone QCD Sum Rules

   Hui-Hui Duan🇨🇳 · Yong-Lu Liu🇨🇳 · Ming-Qiu Huang🇨🇳

   Semileptonic decay processes of ${\Xi }_c\to \Xi \ell {\nu }_{\ell }$ are studied by light-cone QCD sum rules in this paper. The six form factors of ${\Xi }_c\to \Xi$ semileptonic transition matrix elements are calculated by this method with the light-cone distribution amplitudes of $\Xi$ baryon up to twist six. With the six form factors, the absolute branching ratios of ${\Xi }_c^0\to {\Xi }^{-}{\ell }^{+}{\nu }_{\ell }$ and ${\Xi }_c^{+}\to {\Xi }^0{\ell }^{+}{\nu }_{\ell }$ are calculated by the helicity amplitudes formalism of semileptonic differential decay widths. The ratios of absolute branching ratios of electron and muon final states processes give the proof of lepton flavor universality. Our results are in accordance with the recent experimental and theoretical reports.

   hep-phhep-exPRD(2022)·3 citations
6. 06*

   Reply to Comment on "New physics constraints from atomic parity violation in ${}^{133}$Cs"

   B. K. Sahoo🇮🇳 · B. P. Das🇯🇵 · H. Spiesberger🇩🇪

   In Phys. Rev. D 103, L111303 (2021), we had reported an improved calculation of the nuclear spin-independent parity violating electric dipole transition amplitude ($E{1}_{PV}$) for the $6s{}^2{S}_{1/2}-7s{}^2{S}_{1/2}$ transition in ${}^{133}$Cs by employing a relativistic coupled-cluster (RCC) theory. In a recent Comment, B. M. Roberts and J. S. M. Ginges have raised questions about our calculation of the so-called Core contribution to $E{1}_{PV}$. Our result for this contribution does not agree with theirs, but is in agreement with results from previous calculations where this contribution is given explicitly. In our reply, we explain in detail the validity of the evaluation of our core contribution. We emphasize that the Main, Core and Tail contributions have been treated on an equal footing in our work unlike the sum-over-states calculations. We also address their concerns about our approximate treatment of the contributions from the QED corrections, which was not the aim of our work, but was carried out for completeness. Nonetheless, conclusion of our above mentioned paper is not going to affect if we replace our estimated QED contribution to $E{1}_{PV}$ by earlier estimation.

   hep-phphysics.atom-phPRD(2022)·4 citations
7. 07*

   The Generic $U(1{)}_X$ Models Inspired from $SO(10)$

   Tianjun Li🇨🇳 · Qianfei Xiang🇨🇳 · Xiangwei Yin🇨🇳 · Han Zhou🇨🇳

   We propose the family universal $U(1{)}_X$ models with three right-handed neutrinos by choosing the $U(1{)}_X$ gauge symmetry as a linear combination of $U(1{)}_Y\times U(1{)}_{\chi }$ of $SO(10)$. To be consistent with the quantum gravity effects, we introduced a Dirac fermion $\chi$ as a dark matter candidate, which is odd under the gauged $Z_2$ symmetry after $U(1{)}_X$ breaking. The isospin violation dark matter with $f_n/f_p=-0.7$ can be realized naturally, and thus the LUX, PANDAX, and XENON1T experimental constraints can be evaded. Moreover, we study the masses and mixings for Higgs and gauge bosons, consider the LHC constraints on the $Z^{\prime }$ mass, simulate various constraints from dark matter direct and indirect detection experiments, and then present the viable parameter spaces. To study the LHC $Z^{\prime }$ mass bounds on the generic $U(1{)}_X$ models, we considered four kinds of scenarios, where scenario II with zero $U(1{)}_X$ charge for right-handed up-type quarks can relax the LHC $Z^{\prime }$ mass bound a little bit.

   hep-phPRD(2022)·3 citations
8. 08*

   Low-energy interactions of mesons with participation of the first radially excited states in $U(3)\times U(3)$ NJL model

   M.K. Volkov🇷🇺 · A.A. Pivovarov🇷🇺 · K. Nurlan🇷🇺

   The $U(3)\times U(3)$ chiral symmetric NJL model describing pseudoscalar, vector, and axial vector mesons in both the ground state and first radially excited states is shortly presented in this review. In this model, it is possible to describe a large number of low-energy interactions of mesons, $\tau$ lepton decays into mesons and processes of meson production in electron-positron annihilations in satisfactory agreement with the experiments. In describing a number of processes, it turned out to be necessary to take into account the interactions of mesons in the final state.

   hep-phSymmetry(2022)·15 citations
9. 09*

   Drell Yan production in the parton branching method and POWHEG matching

   Armando Bermudez Martinez🇩🇪 · Luis Ignacio Estevez Banos🇩🇪 · Miguel Fernandez Moreira🇨🇺 · Joel Girones Dominguez🇨🇺 · Hannes Jung🇩🇪 · Reiner Ramos Blazquez🇨🇺

   As part of the DESY summer student program 2021, transverse momentum dependent (TMD) parton distributions obtained from the Parton Branching (PB) method were combined with next-to-leading-order (NLO) using the POWHEG method. Computations of the resulting Drell-Yan (DY) transverse momentum spectrum were performed. A good agreement of the theoretical predictions with the measurement performed by the CMS experiment at the center-of-mass energy of 13 TeV is found, at low and intermediate DY $p_{\mathrm{T}}$. The new scale choice option for the matching has been included in the CASCADE event generator.

   hep-ph0 citations
10. 10*

    Magnetic Dual Chiral Density Wave: A Candidate Quark Matter Phase for the Interior of Neutron Stars

    E. J. Ferrer🇺🇸 · V. de la Incera🇺🇸

    In this review, we discuss the physical characteristics of the magnetic dual chiral density wave (MDCDW) phase of dense quark matter and argued why it is a promising candidate for the interior matter phase of neutron stars. The MDCDW condensate occurs in the presence of a magnetic field. It is a single-modulated chiral density wave characterized by two dynamically generated parameters: the fermion quasiparticle mass $m$ and the condensate spatial modulation $q$. The lowest Landau level quasiparticle modes in the MDCDW system are asymmetric about the zero energy, a fact that leads to the topological properties and anomalous electric transport exhibited by this phase. The topology makes the MDCDW phase robust against thermal phonon fluctuations, and as such, it does not display the Landau-Peierls instability, a stapled feature of single-modulated inhomogeneous chiral condensates in three dimensions. The topology is also reflected in the presence of the electromagnetic chiral anomaly in the effective action and in the formation of hybridized propagating modes known as an axion-polaritons. Taking into account that one of the axion-polaritons of this quark phase is gapped, we argued how incident $\gamma$-ray photons can be converted into gapped axion-polaritons in the interior of a magnetar star in the MDCDW phase leading the star to collapse, a phenomenon that can serve to explain the so-called missing pulsar problem in the galactic center.

    hep-phUniverse(2021)·27 citations
11. 11*

    Studies on the $H\to bb$ cross section measurement at the LHeC with a full detector simulation

    Subhasish Behera🇩🇪 · Bernard Brickwedde🇩🇪 · Matthias Schott🇩🇪

    The future Large Hadron electron Collider (LHeC) would allow collisions of an intense electron beam with protons or heavy ions at the High Luminosity-Large Hadron Collider (HL-LHC). Owing to a center of mass energy greater than a TeV and very high luminosity (~1 ab{-1}), the LHeC would not only be a new generation collider for deep-inelastic scattering (DIS) but also an important facility for precision Higgs physics, complementary to pp and e+ e- colliders. Previously, it has been found that uncertainties of 0.8% and 7.4% can be achieved on the Higgs boson coupling strength to b- and c-quarks respectively. These results were obtained in the fast simulation frameworks for the LHeC detector. Focusing on the dominant Higgs boson decay channel, H to bb, the present work aims to give a comparison of these results with a fully simulated detector. We present our results in this study using the publicly available ATLAS software infrastructure. Based on state-of-the art reconstruction algorithms, a novel analysis of the bb decay could be performed leading to an independent verification of the existing results to an exceptionally high precision.

    hep-phhep-exEPJC(2022)·2 citations
12. 12*

    Axion-photon multimessenger astronomy with giant flares

    Javier De Miguel🇯🇵 · Chiko Otani🇯🇵

    We treat prospects for multimessenger astronomy with giant flares (GFs), a rare transient event featured by magnetars that can be as luminous as a hundred of the brightest supernovae ever observed. The beamed photons could correlate with an axion counterpart via resonant conversion in the magnetosphere. In a realistic parameter space, we find that the sensitivity limit to galactic GFs for currently viable experiments is ${\mathrm{g}}_{\varphi \gamma }\gtrsim \mathrm{several}\times 10^{-13}$ GeV${}^{-1}$ \& ${\mathrm{g}}_{\varphi e}\gtrsim \mathrm{few}\times 10^{-12}$. We rule out the compatibility of axion flares with the recent XENON1T excess only due to the time persistence of the signal.

    hep-phastro-ph.COastro-ph.HEhep-exPRD(2022)·7 citations
13. 13*

    Two-loop leading colour helicity amplitudes for $W^{\pm }\gamma +j$ production at the LHC

    Simon Badger🇮🇹 · Heribertus Bayu Hartanto🇬🇧 · Jakub Kryś🇮🇹 · Simone Zoia🇮🇹

    We present the two-loop leading colour QCD helicity amplitudes for the process $pp\to W(\to l\nu )\gamma +j$. We implement a complete reduction of the amplitudes, including the leptonic decay of the $W$-boson, using finite field arithmetic, and extract the analytic finite remainders using a recently identified basis of special functions. Simplified analytic expressions are obtained after considering permutations of a rational kinematic parametrisation and multivariate partial fractioning. We demonstrate efficient numerical evaluation of the two-loop colour and helicity summed finite remainders for physical kinematics, and hence the suitability for phenomenological applications.

    hep-phhep-thJHEP(2022)·68 citations
14. 14*

    Dressed quark-gluon vertex form factors from gauge symmetry

    Bruno El-Bennich🇧🇷 · Fernando E. Serna🇨🇴 · Roberto Correa da Silveira🇧🇷 · Luis Albino · Adnan Bashir🇲🇽 · Eduardo Rojas🇨🇴

    We present preliminary results on the longitudinal $and$ transverse form factors of the quark-gluon vertex as functions of the incoming and outgoing quark momenta and an angle $\theta =2\pi /3$ between them. The expressions for these form factors were previously derived from Slavnov-Taylor identities, gauge covariance and multiplicative renormalizability that firmly constrain the fermion-boson vertex.

    hep-phhep-latnucl-thRev.Mex.Fis.Suppl.(2022)·12 citations
15. 15*

    Searches for $pp\to H^{\pm }h\to W^{\pm }hh$ signal in the MSSM model

    Tetiana Obikhod🇺🇦 · Ievgenii Petrenko🇺🇦

    We considered the new signature of a charged Higgs boson, $pp\to H^{\pm }h\to W^{\pm }hh$, which is almost background free as the promising to study of supersymmetry at the LHC with both $\sqrt{s}=13$ TeV and $\sqrt{s}=14$ TeV. In the framework of MSSM model we used the latest theoretical parameter space, which is consistent with the experimental constraints from Large Hadron Collider and direct or indirect searches. In the surviving regions with the help of Pythia 8.3 and Feynhiggs programs it was found that production cross sections, $\sigma (pp\to H^{\pm }h)$, and Branching Ratios, $BR(H^{\pm }\to W^{\pm }h)$, are the largest at Benchmark Points 4 and 14 correspondingly.

    hep-phIOSR Journal of Applied Physics (IOSR-JAP…·0 citations
16. 16*

    Feynman Integrals

    Stefan Weinzierl🇩🇪

    This course on Feynman integrals starts from the basics, requiring only knowledge from special relativity and undergraduate mathematics. Topics from quantum field theory and advanced mathematics are introduced as they are needed. The course covers modern developments in the field of Feynman integrals. Topics included in this course are: Representations of Feynman integrals, integration-by-parts, differential equations, intersection theory, multiple polylogarithms, Gelfand-Kapranov-Zelevinsky systems, coactions and symbols, cluster algebras, elliptic Feynman integrals, motives associated to Feynman integrals.

    ↳ hep-thhep-phmath-phmath.MP278 citations
17. 17*

    Energy Dependence of Strangeness Production in Heavy-ion Collision

    Md Nasim🇮🇳

    An experimental overview of the energy dependence of strangeness production is presented. The strange hadrons are considered a good probe to study the QCD matter created in relativistic nucleus-nucleus collisions. The heavy-ion experiments at SPS, RHIC, and LHC have recorded a wealth of data in proton-proton, proton-nucleus and nucleus-nucleus collisions at several beam energies. In this proceeding, I discuss the invariant yield and azimuthal anisotropy measurement of strange hadrons in nucleus-nucleus collisions at SPS, RHIC, and LHC.

    ↳ nucl-exhep-exhep-phEPJ Web Conf.(2022)·1 citation
18. 18*

    Quarkyonic matter state of neutron stars

    Gaoqing Cao🇨🇳

    This work extends our previous study of isospin symmetric quarkyonic matter to quarkyonic neutron matter which might be relevant to the inner cores of neutron stars. The vector-isovector $\rho$ mesons are introduced to the model mainly to account for isospin density interactions, just like $\omega$ meson for baryon density interactions. The modified Lagrangian still preserves approximate chiral symmetry which could be significantly broken at lower density. And new free parameters are fixed by adopting the experimental constraints on the symmetry energy and its slope at saturation density. Eventually, the pressure, mass-radius relation, and tidal deformability are explored in advance for the quarkyonic neutron stars. While the pressure and tidal deformability are well consistent with experimental and observational restrictions, the mass-radius relation is unable to reproduce the observed two solar mass of PSR J0740+6620.

    ↳ nucl-thhep-phPRD(2022)·18 citations
19. 19*

    Virtual Photon Emission in Leptonic Decays of Pseudoscalar Mesons

    R. Frezzotti🇮🇹 · G. Gagliardi🇮🇹 · V. Lubicz🇮🇹 · G. Martinelli🇮🇹 · F. Mazzetti🇮🇹 · C. Sachrajda🇬🇧 · F. Sanfilippo🇮🇹 · S. Simula🇮🇹 · N. Tantalo🇮🇹

    We present a preliminary non-perturbative lattice calculation of the form factors entering the processes $K\to \ell {\nu }_{\ell }{\ell }^{\prime +}{\ell }^{\prime -}$ and of the corresponding branching ratios. These form factors describe the interaction between the mediating virtual photon and the internal hadronic structure of the meson. By separating them from the point-like contribution to the matrix element we are able to isolate and reconstruct the structure-dependent contribution to the decay width. Our numerical analysis employs only one gauge ensemble and so it is affected by systematic uncertainties due to the missing continuum and physical point extrapolation. Despite this, we already find a reasonable agreement with the experimental data and with the next to leading order Chiral Perturbation Theory predictions. The method is general and can be applied to any pseudoscalar meson, though for heavier mesons the possibility of internal lighter states becomes problematic and still needs a proper study. A non-perturbative, model-independent lattice evaluation of these processes would allow further progress in the theoretical predictions of SM hadronic quantities and in the search of New Physics.

    ↳ hep-lathep-phPoS(2022)·0 citations
20. 20*

    Effective Lagrangian and stability analysis in warped space

    Haiying Cai🇰🇷

    In the warped space model, the inter-brane distance can be stabilized by the Goldberger-Wise mechanism. Of particular importance, the stabilization potential calls for a proper identification of the dynamical degree of freedom. In this paper, we provided a complete calculation of the effective Lagrangian till the quadratic order that is generic for the Randall-Sundrum model and its $N$-brane $(N\ge 4)$ extensions. By applying the variation principle to a specific perturbation field, we derived the equations of motion and orthogonal conditions for decoupling the graviton. This approach is demonstrated to be equivalent to the analysis using the linearized Einstein equation. Our derivation clarifies that in the $N$-brane set up, just one degree of freedom for the radion field is dynamical, with the other modes eliminated by the gauge fixings. Thus we can directly generalize the GW stabilization to the $N$-brane model in a way similar to the RS1 scenario.

    ↳ hep-thhep-phJHEP(2022)·9 citations
21. 21*

    Building instructions for a ferromagnetic axion haloscope

    Nicolò Crescini🇫🇷

    A ferromagnetic haloscope is a rf spin-magnetometer used for searching Dark Matter in the form of axions. A magnetic material is monitored searching for anomalous magnetization oscillations which can be induced by dark matter axions. To properly devise such instrument one first needs to understand the features of the searched-for signal, namely the effective rf field of dark matter axions $B_a$ acting on electronic spins. Once the properties of $B_a$ are defined, the design and test of the apparatus may start. The optimal sample is a narrow linewidth and high spin-density material such as Yttrium Iron Garnet (YIG), coupled to a microwave cavity with almost matched linewidth to collect the signal. The power in the resonator is collected with an antenna and amplified with a Josephson Parametric amplifier, a quantum-limited device which, however, adds most of the setup noise. The signal is further amplified with low noise HEMT and down-converted for storage with an heterodyne receiver. This work describes how to build such apparatus, with all the experimental details, the main issues one might face, and some solutions.

    ↳ hep-excond-mat.supr-conhep-phEur.Phys.J.Plus(2022)·1 citation
22. 22*

    The Linear Regime of Tachyonic Preheating

    Niko Koivunen🇪🇪 · Eemeli Tomberg🇪🇪 · Hardi Veermäe🇪🇪

    Tachyonic preheating is realized when the inflaton repeatedly returns to a convex region of the potential during the post-inflationary oscillating phase. This will induce a strong tachyonic instability and lead to a rapid fragmentation of the coherent field that can complete within a fraction of an $e$-fold. In this paper, we study the linear regime of this process in a model-independent way. To this purpose, we construct simplified models that provide an analytic Floquet theoretic description of mode growth. This approach captures the essential features of well-motivated tachyonic preheating scenarios, including scenarios in which the inflaton is part of a larger scalar multiplet. We show that tachyonic preheating is efficient if the field excursions are sub-Planckian, can produce gravitational waves in the frequency range of current and future gravitational wave interferometers, and can be consistent with any experimentally allowed tensor-to-scalar ratio.

    ↳ astro-ph.COgr-qchep-phhep-thJCAP(2022)·17 citations
23. 23*

    Charting the landscape of (anti-) de Sitter and Minkowski solutions of 10d supergravities

    David Andriot🇫🇷 · Ludwig Horer🇦🇹 · Paul Marconnet🇫🇷

    We classify solutions of 10d type IIA/B supergravities with orientifolds, on a 4d maximally symmetric spacetime times a 6d group manifold. We then look for new solutions in previously unexplored solution classes, and find some: (anti-) de Sitter solutions with intersecting O4, O6 and D6, or Minkowski solutions with 3 intersecting O5, among others. We provide the numerical code that we developed for this purpose. We also prove new no-go theorems against (anti-) de Sitter solutions. We finally conjecture the absence of de Sitter solution for 2 or less intersecting source sets, implying that a 4d effective theory with de Sitter is at most N=1 supersymmetric.

    ↳ hep-thgr-qchep-phJHEP(2022)·37 citations

* 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.