Thu·Nov 17, 2022Thursday·November 17, 2022

1. 01*

   Geometry Optimization for Long-lived Particle Detectors

   Thomas Gorordo🇺🇸 · Simon Knapen🇺🇸 · Benjamin Nachman🇺🇸 · Dean J. Robinson🇺🇸 · Adi Suresh🇺🇸

   The proposed designs of many auxiliary long-lived particle (LLP) detectors at the LHC call for the instrumentation of a large surface area inside the detector volume, in order to reliably reconstruct tracks and LLP decay vertices. Taking the CODEX-b detector as an example, we provide a proof-of-concept optimization analysis that demonstrates the required instrumented surface area can be substantially reduced for many LLP models, while only marginally affecting the LLP signal efficiency. This optimization permits a significant reduction in cost and installation time, and may also inform the installation order for modular detector elements. We derive a branch-and-bound based optimization algorithm that permits highly computationally efficient determination of optimal detector configurations, subject to any specified LLP vertex and track reconstruction requirements. We outline the features of a newly-developed generalized simulation framework, for the computation of LLP signal efficiencies across a range of LLP models and detector geometries.

   hep-phhep-exphysics.ins-detJINST(2023)·9 citations
2. 02*

   SRF cavities and Superconducting qubits for Gravitational Waves and Dark Photons detection

   Roberto Menta · Anna Grassellino · Roni Harnik · Asher Berlin

   A short review which focuses on the employment of a Superconducting Radio Frequency cavity for detection of Gravitational Waves. This first part is inspired by the works of Berlin et al.. In the second part, we analyze also the idea to use a cavity-qubit system for the GWs detection and the Dark Photons detection. In this case, the starting point is the work of Dixit et al. which will be extended for SQMS cavities.

   hep-ph0 citations
3. 03*

   The Standard Model at 200 GeV

   Zamiul Alam🇺🇸 · Stephen P. Martin🇺🇸

   The Standard Model can be defined quantitatively by running parameters in a mass-independent renormalization scheme at a fixed reference scale. We provide a set of simple interpolation formulas that give the fundamental Lagrangian parameters in the $\overline{\mathrm{MS}}$ scheme at a renormalization scale of 200 GeV, safely above the top-quark mass and suitable for matching to candidate new physics models at very high mass scales using renormalization group equations. These interpolation formulas take as inputs the on-shell experimental quantities, and use the best available calculations in the pure $\overline{\mathrm{MS}}$ scheme. They also serve as an accounting of the parametric uncertainties for the short-distance Standard Model Lagrangian. We also include an interpolating formula for the W boson mass.

   hep-phPRD(2023)·20 citations
4. 04*

   Locating the Core-Mantle Boundary using Oscillations of Atmospheric Neutrinos

   Anuj Kumar Upadhyay🇮🇳 · Anil Kumar🇮🇳 · Sanjib Kumar Agarwalla🇮🇳 · Amol Dighe🇮🇳

   Atmospheric neutrinos provide a unique avenue to explore the internal structure of Earth based on weak interactions, which is complementary to seismic studies and gravitational measurements. In this work, we demonstrate that the atmospheric neutrino oscillations in the presence of Earth matter can serve as an important tool to locate the core-mantle boundary (CMB). An atmospheric neutrino detector like the proposed 50 kt magnetized ICAL at INO can observe the core-passing neutrinos efficiently. These neutrinos would have experienced the MSW resonance and the parametric or neutrino oscillation length resonance. The net effect of these resonances on neutrino flavor conversions depends upon the location of CMB and the density jump at that radius. We quantify the capability of ICAL to measure the location of CMB in the context of multiple three-layered models of Earth. For the model where the density and the radius of core are kept flexible while the mass and radius of Earth as well as the densities of outer and inner mantle are fixed, ICAL can determine the location of CMB with a 1$\sigma$ precision of about 250 km with an exposure of 1000 kt$\cdot$yr. With the 81-layered PREM profile, this $1\sigma$ precision would be about 350 km. The charge identification capability of ICAL plays an important role in achieving this precision.

   hep-phhep-exphysics.ins-detJHEP(2023)·22 citations
5. 05*

   Azimuthal asymmetries in $J/\psi$-photon production at the EIC

   Dipankar Chakrabarti🇮🇳 · Raj Kishore🇮🇳 · Asmita Mukherjee🇮🇳 · Sangem Rajesh🇮🇳

   We calculate azimuthal asymmetries in back-to-back production of $J/\psi$ and a photon in electron-proton scattering process at the future electron-ion collider (EIC) using TMD factorization framework. We consider the cases where the proton is unpolarized or transversely polarized. For the formation of $J/\psi$, non-relativistic QCD (NRQCD) is used. We find that the cross-section gets contribution from only one color octet state, as a result, the azimuthal modulations become independent of the long-distance matrix elements (LDMEs), and thus can be used to probe, in particular the gluon TMDs which are dominant in this kinematics. We show estimates of the upper bounds of different azimuthal asymmetries using the positivity bounds on TMDs. In addition, we show estimate of asymmetries using the Gaussian parametrization of the TMDs.

   hep-phPRD(2023)·15 citations
6. 06*

   Freeze-in Dark Matter Perturbations are Adiabatic

   Davide Racco🇺🇸 · Antonio Riotto🇨🇭

   We show that the large-scale perturbations in the dark matter generated by the freeze-in mechanism are only of adiabatic nature. The freeze-in mechanism is not at odds with the current stringent constraints on isocurvature perturbations.

   hep-phgr-qcJCAP(2023)·10 citations
7. 07*

   Infrared scalar one-loop three point integrals in loop regularization

   Jin Zhang🇨🇳

   The infrared divergent scalar three-point integrals are evaluated by the loop regularization method. Three kinds of infrared divergent integrals, i.e., massless triangle diagram, triangle diagrams with one and two massive internal lines, are systematically evaluated by loop regularization, analytic results are obtained. According the method, the infrared divergences are regulated by the so-called sliding scale ${\mu }_s$ which plays the role of infrared cutoff. The amplitudes obtained through loop regularization depend on ${\mu }_s$ such that we may extract different contribution by varying ${\mu }_s$. Some general results for evaluation of scale one-loop triangle diagram are also derived.

   hep-ph0 citations
8. 08*

   The cross-section for the $\gamma e^{-}\to Z{e}^{-}\to l^{-}{l}^{+}{e}^{-}$ scattering at the LHeC

   Bui Thi Ha Giang🇻🇳

   A measurement of Z production cross-section in $\gamma e^{-}$ collision at Large Hadron-electron Collider (LHeC) is presented to compare to that at International Linear Collider (ILC). The total cross-section depends strongly on the polarization of the initial and final $e^{-}$ beams, the electron beam energy $E_e$ with the energy of the proton beam taken to be $E_p=7$ TeV. The result shows that the total cross-section in $\gamma e^{-}\to Z{e}^{-}\to l^{-}{l}^{+}{e}^{-}$ at LHeC is much larger than that at ILC.

   hep-phCPC(2023)·1 citation
9. 09*

   Scalar and tensor mesons in $d\bar{d}$, $s\bar{s}$ and $gg\to f_0,f_2$

   A.V. Sarantsev🇩🇪 · E. Klempt🇩🇪

   LHCb data on $B^0\to \text{jpsi}{\pi }^{+}{\pi }^{-}$, $B_s^0\to \text{jpsi}{\pi }^{+}{\pi }^{-}$ and $B_s^0\to \text{jpsi}{K}^{+}{K}^{-}$ are fitted in a coupled-channel analysis jointly with data on radiative $\text{jpsi}$ decays, $\pi \pi$ elastic scattering and further data sets. Branching ratios for $B_{(s)}^0\to \text{jpsi}{f}_0,f_2$ are determined and compared to branching ratios from radiative $J/\psi$ decays. Above 1500\,MeV, only little intensity is observed in $B_{(s)}^0\to \text{jpsi}{f}_0,f_2$ decays while in radiative $\text{jpsi}$ decays the intensities peak at 1865\,MeV in the scalar, and at 2210\,MeV in the tensor wave. This pattern is interpreted as further support for the glueball interpretation of $G_0(1865)$ and $G_2(2210)$.

   hep-phInt.J.Mod.Phys.A(2024)·4 citations
10. 10*

    Exploring Wrong Sign Scenarios in the Yukawa-Aligned 2HDM

    Shinya Kanemura🇯🇵 · Tanmoy Mondal🇯🇵 · Kei Yagyu🇯🇵

    We discuss scenarios with wrong-sign (WS) Yukawa couplings for the discovered Higgs boson in the Yukawa-aligned two Higgs doublet model. In the WS scenario, Yukawa couplings for down-type quarks and/or charged leptons have an opposite sign as compared to those of the Higgs boson in the standard model, which can be consistent with current flavour data and the Higgs signal strengths. The phenomenology of additional Higgs bosons in such a scenario can be significantly different from that with right-sign Yukawa couplings, mainly due to a larger Higgs boson mixing to be required in the wrong-sign case. We show the parameter space which is excluded or explored by direct searches for the additional Higgs bosons at the current and high-luminosity LHC under the constraints from perturbative unitarity and vacuum stability. In particular, we find that most of the parameter space is explored in the WS scenario with the Type-X (lepton specific) Yukawa interaction which is a special case of the Yukawa alignment realized by imposing a softly-broken ${\mathbb{Z}}_2$ symmetry. We propose that multi-Higgs events from pair productions of the additional Higgs bosons can be the smoking gun signature to probe the WS scenario, and give the expected number of events at the high-luminosity LHC.

    hep-phhep-exJHEP(2023)·4 citations
11. 11*

    QCD under extreme conditions

    Peter Braun-Munzinger🇩🇪 · Anar Rustamov🇩🇪 · Johanna Stachel🇩🇪

    In nucleus-nucleus collisions at relativistic energies a new kind of matter is created, the Quark-Gluon Plasma (QGP). The phase diagram of such matter and the chemical freeze-out points will be presented in connection to the pseudo-critical temperature for the chiral cross over transition. The role of conserved charge fluctuations to give experimental access to the nature of the chiral phase transition will be summarized in terms of the relation to lattice QCD and the current experimental data. The QGP can be characterized as a nearly ideal liquid expanding hydrodynamically and the experimental data allow to extract transport parameters such as the bulk and shear viscosities. The energy loss of partons in the QGP probes the high parton density of the medium. The role of quarkonia and open charm hadrons as a probe of deconfinement and hadronization form the final topic.

    hep-phhep-exnucl-ex8 citations
12. 12*

    Charged current (anti)neutrino induced eta production off the nucleon

    A. Fatima🇮🇳 · M. Sajjad Athar🇮🇳 · S. K. Singh🇮🇳

    The charged current (anti)neutrino induced eta production from the nucleons is studied in a model based on the effective Lagrangians to evaluate the contribution from the nonresonant and resonant diagrams. The contribution from the nonresonant background terms has been obtained using a microscopic model based on the SU(3) chiral Lagrangians. The contribution from the resonant diagrams due to the low lying $S_{11}(1535)$, $S_{11}(1650)$, and $P_{11}(1710)$ resonances has been evaluated using an effective phenomenological Lagrangian with its parameters determined from the experimental values of their branching ratios and decay widths to the $N\eta$ channel. The model is first used to reproduce satisfactorily the experimental data from the MAINZ and JLab on the total cross sections for the photo- and electro- production of $\eta$ mesons, which fixes the model parameters in the vector current interaction. The PCAC hypothesis and generalized Goldberger-Treiman relation are used to fix the parameters of the axial vector interaction. The model is then applied to study the weak production of eta mesons induced by the neutrinos and antineutrinos, and predicts the numerical values for the $Q^2$-distribution, $\eta$-momentum distribution, and the total cross section for the reactions ${\nu }_{\mu }+n⟶{\mu }^{-}+p+\eta$ and ${\bar{\nu }}_{\mu }+p⟶{\mu }^{+}+n+\eta$ in the energy region up to 2 GeV. It is found that the photo, electro, and (anti)neutrino production of eta mesons is dominated by the contribution from the $S_{11}(1535)$ resonance. The results discussed in this work are relevant for the present and future accelerator experiments like MicroBooNE, T2K, NOvA, MINERvA, T2-HyperK and DUNE as well as for the atmospheric neutrino experiments.

    hep-phhep-exnucl-thPRD(2023)·6 citations
13. 13*

    Two-loop form factors for pseudo-scalar quarkonium production and decay

    Samuel Abreu🇨🇭 · Matteo Becchetti🇮🇹 · Claude Duhr🇩🇪 · Melih A. Ozcelik🇫🇷

    We present the analytic expressions for the two-loop form factors for the production or decay of pseudo-scalar quarkonia, in a scheme where the quarks are produced at threshold. We consider the two-loop amplitude for the process $\gamma \gamma \leftrightarrow {}^1{S}_0^{[1]}$, that was previously known only numerically, as well as for the processes $gg\leftrightarrow {}^1{S}_0^{[1]}$, $\gamma g\leftrightarrow {}^1{S}_0^{[8]}$ and $gg\leftrightarrow {}^1{S}_0^{[8]}$, which have not been computed before. The two-loop corrections to $gg\leftrightarrow {}^1{S}_0^{[1]}$ are the last missing ingredients for a full NNLO calculation of ${\eta }_Q$ hadro-production. We discuss how the singularity structure of the amplitudes is affected by the threshold kinematics, which in particular introduces Coulomb singularities. In this context, we first show how the usual structure of the infrared singularities degenerates at threshold kinematics, and then extract the anomalous dimensions governing the Coulomb singularities for colour-singlet and octet channels, the latter being presented here for the first time. We give high-precision numerical results for the hard functions, which can be used for phenomenological studies of ${\eta }_Q$ production and decay at NNLO.

    hep-phnucl-thJHEP(2023)·22 citations
14. 14*

    Gravitational Waves from dark composite dynamics

    Manuel Reichert🇬🇧 · Zhi-Wei Wang🇨🇳

    We discuss the stochastic gravitational-wave spectrum from dark confinement and chiral phase transitions in the early Universe. Specifically, we look at pure Yang-Mills theory for an arbitrary number of colours as well as SU(3) with quarks in different representations. We utilise thermodynamic lattice data and map it to effective models, such as the Polyakov-loop and the PNJL model. This allows us to compute gravitational-wave parameters and the corresponding gravitational-wave signal. We compare the signal to future gravitational-wave observatories such as the Big Bang Observer and DECIGO.

    hep-phastro-ph.COhep-lathep-thEPJ Web Conf.(2022)·26 citations
15. 15*

    Observation of two zeros of the real amplitude in pp scattering at LHC energies

    Anderson Kendi Kohara🇵🇱

    Elastic scattering of charged hadrons is described by the combination of nuclear and Coulomb amplitudes. It is well know that at the very forward range the nuclear real and Coulomb parts interplay a crucial role in the determination of the magnitude of the real part at $|t|=0$. However, beyond $|t|=0$ the real and imaginary nuclear amplitudes have different $t$ dependencies and we show that at LHC energies the zeros formed by the combination $T_C(t)+T_R^N(s,t)=0$ in pp process can be potentially observed when the background due to the imaginary part is removed. This observation constrains the real part at this forward range.

    hep-phEPJC(2023)·2 citations
16. 16*

    Constraining PDFs and nPDFs with recent data

    Petja Paakkinen🇫🇮

    The progress in constraining proton and nuclear parton distribution functions is briefly summarised. Some persistent uncertainties are pointed out and recent experimental advancements highlighted.

    hep-phActa Phys.Polon.Supp.(2023)·0 citations
17. 17*

    Nuclear PDFs at the beginning of LHC Run 3

    Petja Paakkinen🇫🇮

    Nuclear parton distribution functions (nuclear PDFs), collinearly factorizable in perturbative QCD (pQCD), are currently extracted most reliably from global analyses of experimental data. Recently, the progress in this field has been driven mainly by the new data from LHC proton-lead collisions. I will review the progress in using data from LHC Run 1 and 2 and also hint at some opportunities and challenges that we face during LHC Run 3.

    hep-phPoS(2023)·5 citations
18. 18*

    Study of the resonance contributions in the ${\Xi }_b^{-}\to p{K}^{-}{K}^{-}$ decay

    Zhong-Yu Wang🇨🇳 · Si-Qiang Luo🇨🇳 · Zhi-Feng Sun🇨🇳 · C. W. Xiao🇨🇳 · Xiang Liu🇨🇳

    The decay process ${\Xi }_b^{-}\to p{K}^{-}{K}^{-}$ is studied with the final state interaction approach by considering the contributions from the $S$-wave meson-baryon interactions, and also the intermediate state $\Lambda (1520)$ in the $D$-wave. The low-lying resonances $\Lambda (1405)$ and $\Lambda (1670)$ have significant contributions, which are both dynamically generated from the $S$-wave final state interactions with isospin $I=0$. Furthermore, the $\Lambda (1520)$ state also has important contributions from $D$-wave. With these resonances contributions, the experimental data of the lower $p{K}^{-}$ invariant mass distributions are well described. We also discuss the contribution of another resonance in the $S$-wave with isospoin $I=1$, which cannot be ignored. Moreover, some of the branching fractions obtained for the corresponding decay channels are consistent with the experimental measurements.

    hep-phPRD(2022)·5 citations
19. 19*

    Probing the Weak Mixing Angle at high energies at the LHC

    Federico Vazzoler🇩🇪 · Simone Amoroso🇩🇪 · Ekaterina Lipka🇩🇪 · Clara Lavinia Del Pio🇮🇹 · Mauro Chiesa🇮🇹 · Fulvio Piccinini🇮🇹 · Alessandro Vicini🇮🇹

    The electroweak mixing angle is a fundamental parameter of the theory of electroweak interactions. Its value has been measured precisely at the $\mathrm{Z}$-pole at colliders. In this contribution, we propose to exploit measurements of Neutral-Current Drell-Yan production at the Large Hadron Collider at large invariant dilepton masses to determine the energy scale dependence (running) of the electroweak mixing angle in the $\overline{\text{MS}}$ renormalisation scheme, ${\sin }^2{\theta }_{W,\ell }^{\overline{\text{MS}}}(\mu )$. Such a measurement can be used to confirm the Standard Model predictions for the $\overline{\text{MS}}$ running at $\text{TeV}$ scales, and to set model-independent constraints on new states with electroweak quantum numbers. To this end, we make use of a dedicated implementation of ${\sin }^2{\theta }_{W,\ell }^{\overline{\text{MS}}}(\mu )$ in the POWHEG-BOX-V2 Monte Carlo event generator, which we use to explore the potential of future analyses using the data of the LHC Run 3 and High-Luminosity.

    hep-phPoS·0 citations
20. 20*

    Photoproduction of the $B_c$ meson at the future $e^{+}{e}^{-}$ colliders

    Xi-Jie Zhan🇨🇳 · Xing-Gang Wu🇨🇳 · Xu-Chang Zheng🇨🇳

    In the present paper, we study the photoproduction of various $S$-wave $B_c$ states, i.e. $B_c(1{}^1{S}_0)$, $B_c^{\ast }(1{}^1{S}_0)$, $B_c(2{}^1{S}_0)$ and $B_c^{\ast }(2{}^3{S}_1)$, at future $e^{+}{e}^{-}$ colliders within the framework of non-relativistic QCD. Two sources of the initial photons can be realized in the production, i.e., the LBS photon and the WWA photon. In addition to the direct photoproduction via the sub-process, $\gamma +\gamma \to B_c+b+\bar{c}$, we also calculate the resolved photoproduction via the sub-processes, $\gamma +g\to B_c+b+\bar{c}$ and $q+\bar{q}\to B_c+b+\bar{c}$ with $q=u,d,s,g$, respectively. Numerical results indicate that the contributions from the single resolved photoproduction are significant and even dominant at certain collision configuration. At the future high-energy and high-luminosity $e^{+}{e}^{-}$ colliders, the $B_c$ meson generated via the photoproduction mechanism is promisingly observable and can be well studied.

    hep-phPRD(2022)·8 citations
21. 21*

    Ground state baryons in the flux-tube three-body confinement model using Diffusion Monte Carlo

    Yao Ma🇨🇳 · Lu Meng🇩🇪 · Yan-Ke Chen🇨🇳 · Shi-Lin Zhu🇨🇳

    We make a systematical diffusion Monte Carlo (DMC) calculation for all ground state baryons in two confinement scenarios, the pairwise confinement and the three-body flux-tube confinement. With the baryons as an example, we illustrate a feasible procedure to investigate the few-quark states with possible few-body confinement mechanisms, which can be extended to the multiquark states easily. For each baryon, we extract the mass, mean-square radius, charge radius, and the quark distributions. We use the Jackknife resampling method to estimate the statistical uncertainties of masses to be less than 1 MeV. To determine the baryon charge radii, we include the constituent quark size effect, which is fixed by the experimental and lattice QCD results. Our results show that both two-body and three-body confinement mechanisms can give a good description of the experimental data if the parameters are chosen properly. In the flux-tube confinement, introducing different tension parameters for the baryons and mesons are necessary, specifically, ${\sigma }_Y=0.9204{\sigma }_{Q\bar{Q}}$. The lesson from the calculation of the nucleon mass with the DMC method is that the improper pre-assignment of the channels may prevent us from obtaining the real ground state. With this experience, we obtain the real ground state (the ${\eta }_c{\eta }_c$ threshold with the di-meson configuration) of the $cc\bar{c}\bar{c}$ system with $J^{PC}=0^{++}$ starting from the diquark-antidiquark spin-color channels alone, which is hard to achieve in the variational method and was not obtained in the previous DMC calculations.

    hep-phhep-exhep-latnucl-thPRD(2023)·25 citations
22. 22*

    NLO QCD corrections to polarised di-boson production in semi-leptonic final states

    Ansgar Denner🇩🇪 · Christoph Haitz🇩🇪 · Giovanni Pelliccioli🇩🇪

    Understanding the polarisation structure and providing precise predictions for multi-boson processes at the LHC is becoming urgent in the light of the upcoming run-3 and high-luminosity data. The CMS and ATLAS collaborations have already started using polarised predictions to perform template fits of the data, getting access to the polarisation of W and Z bosons. So far, only fully-leptonic decay channels have been considered in this perspective. The natural step forward is the investigation of hadronic decays of electroweak bosons. In this work, we compute NLO QCD corrections to the production and decay of WZ pairs at the LHC in final states with two charged leptons and jets. The calculation relies on the double-pole approximation and the separation of polarised states at the level of Standard Model amplitudes. The presented NLO-accurate results are necessary building blocks for a broad understanding and precise modelling of polarised di-boson production in semi-leptonic decay channels.

    hep-phhep-exPRD(2023)·31 citations
23. 23*

    Spontaneous scale symmetry breaking at high temperature

    Zygmunt Lalak🇵🇱 · Paulina Michalak🇵🇱

    We consider a scale symmetric extension of the Standard Model Higgs scalar sector. The new sector, dilaton, is responsible for the generation of mass scales and may have geometric origin in the Weyl gravity ${\tilde{R}}^2$ term. We show how temperature as a mass scale breaks scale symmetry explicitly and through a nonvanishing thermal vev. In addition we demonstrate that cosmological evolution of the dilaton-Higgs system can lead to late time mass scales, which agree with the Standard Model.

    hep-phJHEP(2023)·5 citations
24. 24*

    Neutrinos production by photons scattered on the dark matter

    Vitaly Beylin🇷🇺

    In the framework of hypercolor scenario of multicomponent Dark Matter, inelastic interaction of high energy photons with the Dark Matter candidates is considered. This reaction results in production of energetic leptons and neutrinos, and the Dark Matter particles also can be boosted. Total and differential cross sections have been calculated. The search of correlations between detected signals of high-energy photons and neutrinos can give an information on the Dark Matter scenario and dynamics.

    hep-ph0 citations
25. 25*

    ${\Lambda }_b\to \Lambda (\to p{\pi }^{-}){\ell }^{+}{\ell }^{-}$ as probe of CP-violating New Physics

    Diganta Das🇮🇳 · Jaydeb Das🇮🇳 · Girish Kumar🇹🇼 · Niladribihari Sahoo🇬🇧

    We investigate the possible sizes of all the CP-violating asymmetries offered by the angular distribution of rare decay ${\Lambda }_b\to \Lambda (\to p{\pi }^{-}){\ell }^{+}{\ell }^{-}$ in the Standard Model and new physics scenarios motivated by the recent $b\to s{\ell }^{+}{\ell }^{-}$ anomalies. We work in a model-independent effective theory framework and discuss the sensitivity of CP asymmetries to new $O_{9,10}$ operators and their chirality flipped counterparts. We find that the size of many of the CP asymmetries can be at the level of a few percent in new physics scenarios consistent with current $b\to s{\ell }^{+}{\ell }^{-}$ data at a level of $1\sigma$. We emphasize that measurements of these CP asymmetries can be used to discriminate different new physics scenarios in $b\to s{\ell }^{+}{\ell }^{-}$.

    hep-phPRD(2023)·8 citations
26. 26*

    Revisiting pseudo-Dirac neutrino scenario after recent solar neutrino data

    S. Ansarifard🇮🇷 · Y. Farzan🇮🇷

    It is still unknown whether the mass terms for neutrinos are of Majorana type or of Dirac type. An interesting possibility, known as pseudo-Dirac scheme combines these two with a dominant Dirac mass term and a subdominant Majorana one. As a result, the mass eigenstates come in pairs with a maximal mixing and a small splitting determined by the Majorana mass. This will affect the neutrino oscillation pattern for long baselines. We revisit this scenario employing recent solar neutrino data, including the seasonal variation of the ${}^7$Be flux recently reported by BOREXINO. We constrain the splitting using these data and find that both the time integrated solar neutrino data and the seasonal variation independently point towards a new pseudo-Dirac solution with nonzero splitting for ${\nu }_2$ of $\Delta m_2^2\simeq 1.5\times 10^{-11}$ eV${}^2$. We propose alternative methods to test this new solution. In particular, we point out the importance of measuring the solar neutrino flux at the intermediate energies $1.5\mathrm{MeV}<E_{\nu }<3.5\mathrm{MeV}$ (below the Super-Kamiokande detection threshold) as well as a more precise measurement of the $pep$ flux. The code is available on \href{https://github.com/SaeedAnsarifard/SolarNeutrinos-pseudoDirac.git}{Github}

    hep-phPRD(2023)·25 citations
27. 27*

    Glueballs from bound state equations

    Markus Q. Huber🇩🇪 · Christian S. Fischer🇩🇪 · Helios Sanchis-Alepuz🇦🇹

    Glueballs are bound states in the spectrum of quantum chromodynamics which consist only of gluons. They belong to the group of exotic hadrons which are widely studied experimentally and theoretically. We summarize how to calculate glueballs in a functional framework and discuss results for pure Yang-Mills theory. Our setup is totally self-contained with the scale being the only external input. We enumerate a range of tests that provide evidence of the stability of the results. This illustrates the potential of functional equations as a continuum first-principles method complementary to lattice calculations.

    hep-phEPJ Web Conf.(2022)·4 citations
28. 28*

    Dynamics of Dark Matter Misalignment Through the Higgs Portal

    Brian Batell🇺🇸 · Akshay Ghalsasi🇺🇸 · Mudit Rai🇺🇸

    A light singlet scalar field feebly coupled through the super-renormalizable Higgs portal provides a minimal and well-motivated realization of ultra-light bosonic dark matter. We study the cosmological production of dark matter in this model by elucidating the dynamics of two sources of scalar field misalignment generated during the radiation era. For large scalar masses (above order $10^{-3}\mathrm{eV}$), dark matter is produced through thermal misalignment, by which the scalar field is driven towards large field values as a result of the finite-temperature effective potential. The dominance of thermal misalignment in this mass range leads to a sharp relic abundance prediction which is, to a significant extent, insensitive to the initial conditions of the scalar field. On the other hand, for low mass scalars (below order $10^{-5}\mathrm{eV}$), dark matter is produced via VEV misalignment, which is caused by the induced scalar field vacuum expectation value triggered by the electroweak phase transition. We show that the relic abundance in this low mass range is sensitive to the scalar field initial conditions. In the intermediate mass range, the relic abundance is a consequence of a competition between thermal misalignment and VEV misalignment, leading to novel forced resonance effects which cause a recurring enhancement and suppression in the late time oscillation amplitude as a function of the scalar mass. We compare our relic abundance predictions with constraints and projections from equivalence principle and inverse square law tests, stellar cooling, resonant molecular absorption, and observations of extra-galactic background light and diffuse X-ray backgrounds. New experimental ideas are needed to probe most of the cosmologically motivated regions of parameter space.

    hep-phastro-ph.COJHEP(2024)·22 citations
29. 29*

    Maximum entropy freezeout of hydrodynamic fluctuations

    Maneesha Sushama Pradeep🇺🇸 · Mikhail Stephanov🇺🇸

    We propose a general approach to freezing out fluctuations in heavy-ion collisions using the principle of maximum entropy. We find the results naturally expressed as a direct relationship between the irreducible relative correlators quantifying the deviations of hydrodynamic as well as hadron gas fluctuations from the ideal hadron gas baseline. The method also allows us to determine heretofore unknown parameters crucial for the freezeout of fluctuations near the QCD critical point in terms of the QCD equation of state.

    hep-phhep-thnucl-thPRL(2023)·34 citations
30. 30*

    Evanescent Operators in One-Loop Matching Computations

    Javier Fuentes-Martín🇪🇸 · Matthias König🇩🇪 · Julie Pagès🇺🇸 · Anders Eller Thomsen🇨🇭 · Felix Wilsch🇨🇭

    Effective Field Theory calculations used in countless phenomenological analyses employ dimensional regularization, and at intermediate stages of computations, the operator bases extend beyond the four-dimensional ones. The extra pieces -- the evanescent operators -- can ultimately be removed with a suitable renormalization scheme, resulting in a finite shift of the physical operators. Modern Effective Field Theory matching techniques relying on the method of expansion by regions have to be extended to account for this. After illustrating the importance of these shifts in two specific examples, we compute the finite shifts required to remove all evanescent operators appearing in the one-loop matching of generic ultraviolet theories to the Standard Model Effective Field Theory and elucidate the formalism for generic Effective Field Theory calculations.

    hep-phJHEP(2023)·72 citations
31. 31*

    Towards TeV-Scale Supersymmetric Electroweak Baryogenesis

    Oleksii Matsedonskyi🇬🇧 · James Unwin🇺🇸 · Qingyun Wang🇺🇸

    Electroweak baryogenesis (EWBG) offers a compelling narrative for the generation of the baryon asymmetry, however it cannot be realised in the Standard Model, and leads to severe experimental tensions in the Minimal Supersymmetric Standard Model (MSSM). One of the reasons for these experimental tensions is that in traditional approaches to EWBG new physics is required to enter at the electroweak phase transition, which conventionally is fixed near $\sim$100 GeV. Here we demonstrate that the addition of sub-TeV fields in supersymmetric extensions of the Standard Model permits TeV-scale strongly first-order electroweak phase transition. While earlier literature suggested no-go arguments with regards to high-temperature symmetry breaking in supersymmetric models, we show these can be evaded by employing a systematic suppression of certain thermal corrections in theories with a large number of states. The models presented push the new physics needed for EWBG to higher scales, hence presenting new parameter regions in which to realize EWBG and evade experimental tensions, however they are not expected to render EWBG completely outside of the foreseeable future experimental reach.

    hep-phJHEP(2023)·9 citations
32. 32*

    Dark Matter or Regular Matter in Neutron Stars? How to tell the difference from the coalescence of compact objects

    Maurício Hippert🇺🇸 · Emily Dillingham🇺🇸 · Hung Tan🇺🇸 · David Curtin🇨🇦 · Jacquelyn Noronha-Hostler🇺🇸 · Nicolás Yunes🇺🇸

    The mirror twin Higgs model is a candidate for (strongly-interacting) complex dark matter, which mirrors SM interactions with heavier quark masses. A consequence of this model are mirror neutron stars -- exotic stars made entirely of mirror matter, which are significantly smaller than neutron stars and electromagnetically dark. This makes mergers of two mirror neutron stars detectable and distinguishable in gravitational wave observations, but can we observationally distinguish between regular neutron stars and those that may contain some mirror matter? This is the question we study in this paper, focusing on two possible realizations of mirror matter coupled to standard model matter within a compact object: (i) mirror matter captured by a neutron star and (ii) mirror neutron star-neutron star coalescences. Regarding (i), we find that (non-rotating) mirror-matter-admixed neutron stars no longer have a single mass-radius sequence, but rather exist in a two-dimensional mass-radius plane. Regarding (ii), we find that binary systems with mirror neutron stars would span a much wider range of chirp masses and completely different binary Love relations, allowing merger remnants to be very light black holes. The implications of this are that gravitational wave observations with advanced LIGO and Virgo, and X-ray observations with NICER, could detect or constrain the existence of mirror matter through searches with wider model and parameter priors.

    ↳ astro-ph.HEgr-qchep-phnucl-thPRD(2023)·77 citations
33. 33*

    Snowmass Neutrino Frontier Report

    Patrick Huber🇺🇸 · Kate Scholberg🇺🇸 · Elizabeth Worcester🇺🇸 · Jonathan Asaadi🇺🇸 · A. Baha Balantekin🇺🇸 · Nathaniel Bowden🇺🇸 · Pilar Coloma🇪🇸 · Peter B. Denton🇺🇸 · André de Gouvêa🇺🇸 · Laura Fields🇺🇸 · Megan Friend🇯🇵 · Steven Gardiner🇺🇸 and 47 other authors

    This report summarizes the current status of neutrino physics and the broad and exciting future prospects identified for the Neutrino Frontier as part of the 2021 Snowmass Process.

    ↳ hep-exastro-ph.COastro-ph.SRhep-ph+129 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.