Tue·Jan 25, 2022Tuesday·January 25, 2022

1. 01*

   Search for long-lived axions with far detectors at future lepton colliders

   Minglun Tian🇨🇳 · Zeren Simon Wang🇹🇼 · Kechen Wang🇨🇳

   In our previous work [Phys. Rev. D 101 (2020) 075046], we have proposed to install FAr Detectors at the Electron Positron Collider (FADEPC) to enhance the discovery potential of long-lived particles (LLPs). In this study, we consider eight designs of far detectors with different locations, volumes and geometries and investigate their potential for discovering long-lived axion-like particles (ALPs) via the process $e^{-}{e}^{+}\to \gamma a,a\to \gamma \gamma$ at future $e^{-}{e}^{+}$ colliders running at a center-of-mass energy of 91.2 GeV and integrated luminosities of 16, 150, and 750 ab${}^{-1}$. We estimate their sensitivities on the model parameters in terms of the effective ALP-photon-photon coupling $C_{\gamma \gamma }/\Lambda$, the effective ALP-photon-$Z$ coupling $C_{\gamma Z}/\Lambda$, and ALP mass $m_a$ for three physics scenarios: $C_{\gamma Z}=0$; $C_{\gamma Z}=C_{\gamma \gamma }$ and both $C_{\gamma Z}$ and $C_{\gamma \gamma }$ can freely change. The results provide references for the optimization of far detectors at future electron-positron colliders.

   hep-ph25 citations
2. 02*

   NLO QCD Corrections to (${\gamma }^{\ast }\to Q\bar{Q}$)-Reggeon Vertex

   Li Ping Sun🇨🇳 · Long Bin Chen🇨🇳 · Cong Feng Qiao🇨🇳 · Kuang Ta Chao🇨🇳

   Next-to-leading order QCD corrections to the ${\gamma }^{\ast }⟶Q\bar{Q}-Reggeon$ vertex are calculated, where $Q\bar{Q}$ denotes a heavy quark pair $c\bar{c}$ or $b\bar{b}$. The heavy quark mass effects on the photon impact factor are found to be significant, and hence may influence the results of high energy photon-photon scattering and heavy quark pair leptoproduction. In our NLO calculation, similar to the massless case, the ultraviolate(UV) divergences are fully renormalized in the standard procedure, while the infrared (IR) divergences are regulated by the parameter ${ϵ}_{IR}$ in dimensional regularization. For the process ${\gamma }^{\ast }+q\to Q\bar{Q}+q$, we calculate all NLO coefficients in terms of ${ϵ}_{IR}$, and find they are enhanced due to the heavy quark mass, as compared with the light quark case, and the enhancement factors increase rapidly as the quark mass increases. This might essentially indicate the quark mass effect, in spite of the absence of real corrections that are needed in a complete NLO calculation. Moreover, unlike the ${\gamma }^{\ast }$ to massless-quark-Reggeon vertex, the results in the present work may apply to the real photon case.

   hep-phPRD(2022)·0 citations
3. 03*

   Spin and polarization analysis of $Z_{cs}$ state

   Hong Chen🇨🇳 · Qi Huang🇨🇳 · Rong-Gang Ping🇨🇳

   A polarization analysis is performed for the recent observation of $Z_{cs}$ exotic state in the $e^{+}{e}^{-}$ annihilation experiment with motivation for measuring its spin quantum number in the future. Starting with the unpolarized electron and positron beam, the polarization transfer to the $Z_{cs}$ state and its decay angular distribution patterns are investigated. Some observables are suggested for determination of the spin parity quantum numbers. An ensemble of Monte-Carlo events are used to show some moment distributions special for manifestation of the different $Z_{cs}$ spin scenarios.

   hep-phPRD(2022)·4 citations
4. 04*

   High $Q^2$ Behavior of the Proton Structure Function through the Balitsky-Kovchegov Equation

   Wei Kou🇨🇳 · Gang Xie🇨🇳 · Xiaopeng Wang🇨🇳 · Chengdong Han🇨🇳 · Xurong Chen🇨🇳

   Numerous experimental and theoretical investigations have highlighted the power law behavior of the proton structure function $F_2(x,Q^2)$, particularly the dependence of its power constant on various kinematic variables. In this study, we analyze the proton structure function $F_2$ employing the analytical solution of the Balitsky-Kovchegov equation, with a focus on the high $Q^2$ regime and small $x$ domains. Our results indicate that as $Q^2$ increases, the slope parameter $\lambda$, which characterizes the growth rate of $F_2$, exhibits a gradual decrease, approaching a limiting value of $\lambda \approx 0.41\pm 0.01$ for large $Q^2$. We suggest that this behavior of $\lambda$ may be attributed to mechanisms such as gluon overlap and the suppression of phase space growth. To substantiate these conclusions, further high-precision electron-ion collision experiments are required, encompassing a broad range of $Q^2$ and $x$.

   hep-ph2 citations
5. 05*

   Secluded Dark Matter in Gauged $B-L$ Model

   Priyotosh Bandyopadhyay🇮🇳 · Manimala Mitra🇮🇳 · Rojalin Padhan🇮🇳 · Abhishek Roy🇮🇳 · Michael Spannowsky🇬🇧

   We consider the gauged $B-L$ model which is extended with a secluded dark sector, comprising of two dark sector particles. In this framework the lightest ${\mathcal{Z}}_2$-odd particle is the dark matter candidate, having a feeble interaction with all other SM and BSM states. The next-to-lightest ${\mathcal{Z}}_2$-odd particle in the dark sector is a super-wimp, with large interaction strength with the SM and BSM states. We analyse all the relevant production processes that contribute to the dark matter relic abundance, and broadly classify them in two different scenarios, a) dark matter is primarily produced via the non-thermal production process, b) dark matter is produced mostly from the late decay of the next-to-lightest ${\mathcal{Z}}_2$-odd particle. We discuss the dependency of the relic abundance of the dark matter on various model parameters. Furthermore, we also analyse the discovery prospect of the BSM Higgs via invisible Higgs decay searches.

   hep-phastro-ph.COJHEP(2022)·7 citations
6. 06*

   Quark condensate in QCD at nonzero magnetic field and temperature

   Yu.A.Simonov🇷🇺

   The basic form of the quark condensate for arbitrary values of external magnetic field and temperature, is derived using the field equations with account of confinement. The resulting expression of the chiral condensate is shown to be proportional to square of the singlet $q\bar{q}$ ground state wave function at origin, $|{\varphi }_0(0){|}^2$. For light quarks without magnetic field the condensates are proportional to ${\sigma }^{3/2}$ ($\sigma$ is the string tension). Numerical results are presented in 5 Tables and shown to be in good agreement with the lattice data, both for nonzero magnetic field $eB$ and temperature $T$ in the range $0<T<120$~MeV,~ $0<eB<4$~GeV${}^2$.

   hep-phhep-latPhys.Atom.Nucl.(2022)·4 citations
7. 07*

   Understanding $J/\psi$ and ${\psi }^{\prime }$ production using a modified version of Non-Relativistic Quantum Chromodynamics

   Sudhansu S. Biswal🇮🇳 · Sushree S. Mishra🇮🇳 · K. Sridhar🇮🇳

   There is serious disagreement between the predictions of Non-Relativistic Quantum Chromodynamics (NRQCD) and the data on $J/\psi$ polarisation which has persisted for almost a quarter of a century. We find that if we account for the effect of perturbative soft gluons on the intermediate charm-anticharm octet states in NRQCD then the polarisation problem can be resolved. In addition, this model, when used to fit the Run 1 data on $J/\psi$ and ${\psi }^{\prime }$ production from the CDF experiment at Tevatron, gives good fits and yields values of (energy-independent) non-perturbative parameters. These, in turn, can be used to make parameter-free predictions for $J/\psi$ and ${\psi }^{\prime }$ data from the CMS experiment at the Large Hadron Collider and the predictions are in excellent agreement with the CMS data.

   hep-phhep-exPLB(2022)·11 citations
8. 08*

   Centrality dependence and isospin effect on $\text{Wpm}$ and $\text{Zn}$ productions in nucleus-nucleus collisions at $\text{sNN}=5.02$~TeV

   Dai-Mei Zhou🇨🇳 · Yu-Liang Yan🇨🇳 · Liang Zheng🇨🇳 · Ming-Rui Zhao🇨🇳 · Xiao-Mei Li🇨🇳 · Xiao-Ming Zhang🇨🇳 · Gang Chen🇨🇳 · An-Ke Lei🇨🇳 · Ya-Qian Zhu🇨🇳 · Xu Cai🇨🇳 · Ben-Hao Sa🇨🇳

   In this paper, the centrality dependent $\text{Zn}$ and $\text{Wpm}$ production and the isospin effect in $\text{Wpm}$ production are investigated with a parton and hadron cascade model PACIAE in Pb--Pb collisions at $\text{sNN}=5.02$~TeV. ALICE data of $\text{Zn}$ production in Pb--Pb collisions at $\text{sNN}=5.02$~TeV are found to be reproduced fairly well. The prediction on $\text{Wpm}$ production in the same collision system is given as well. An interesting isospin effect is observed in exploring the charge asymmetry between $\text{Wp}$ and $\text{Wm}$ as a function of the asymmetry between number of valence $u$- and $d$-quarks varied from small to large collision systems at center-of-mass energy 5.02 TeV. The results serve as a important benchmarks for understanding the initial conditions of heavy-ion collisions.

   hep-ph0 citations
9. 09*

   Search for exotic leptons in final states with two or three leptons and fat-jets at 13 TeV LHC

   Saiyad Ashanujjaman🇮🇳 · Debajyoti Choudhury🇮🇳 · Kirtiman Ghosh🇮🇳

   Exotic leptons in large gauge multiplets, appearing in many scenarios beyond the Standard Model (SM), can be produced at the LHC in pairs or association. Owing to their large masses, their eventual decay products -- SM leptons and bosons -- tend to be highly boosted, with the jets stemming from the SM bosons more likely to manifest themselves as a single fat-jet rather than two resolved ones. With the corresponding SM backgrounds being suppressed, final states with two or three leptons and one or two fat-jets are expected to be sensitive in probing exotic fermions much heavier than 1 TeV, and we propose and investigate an appropriate search strategy. To concentrate on the essential, we consider extensions of the SM by leptonic multiplets of a single kind (triplets, quadruplets or quintuplets), bearing in mind that such simplified models typically arise as low-energy limits of more ambitious scenarios addressing various lacunae of the SM. Performing a systematic and comprehensive study of nine such scenarios at the 13 TeV LHC, we find that the corresponding $5\sigma$ discovery reaches a range from 985 GeV to 1650 GeV (1345 GeV to 2020 GeV) for 300 (3000) fb${}^{-1}$.

   hep-phJHEP(2022)·13 citations
10. 10*

    Probing Higgs portals with matrix-element based kinematic discriminants in $ZZ\to 4\ell$ production

    Ulrich Haisch🇩🇪 · Gabriël Koole🇩🇪

    A Higgs portal in the form of the operator $|H{|}^2$ provides a minimal and theoretically motivated link between the Standard Model (SM) and new physics. While Higgs portals can be constrained well by exotic Higgs decays if the beyond-the-SM states are light, testing scenarios where these particles are kinematically inaccessible is known to be challenging. We explore the sensitivity of future hadron collider measurements of $ZZ\to 4\ell$ production in constraining Higgs portal interactions. It is shown that by using a matrix-element based kinematic discriminant the reach of the high-luminosity option of the Large Hadron Collider (LHC) can be significantly enhanced compared to studies that are based on measurements of the four-lepton invariant mass spectrum alone. We also analyse the potential of the high-energy upgrade of the LHC and a Future Circular Collider in constraining new physics that couples to $|H{|}^2$. The obtained constraints are compared to the limits one expects to find from other single-Higgs probes. In addition, we provide an independent analysis of the relevant Higgs portal effects in double-Higgs production. We find that the constraints obtained from our $ZZ\to 4\ell$ analysis turn out to be both competitive with and complementary to the projected limits obtained using other search techniques.

    hep-phhep-exJHEP(2022)·12 citations
11. 11*

    Gluon condensates and effective gluon mass

    Jan Horak🇩🇪 · Friederike Ihssen🇩🇪 · Joannis Papavassiliou🇪🇸 · Jan M. Pawlowski🇩🇪 · Axel Weber🇩🇪 · Christof Wetterich🇩🇪

    Lattice simulations along with studies in continuum QCD indicate that non-perturbative quantum fluctuations lead to an infrared regularisation of the gluon propagator in covariant gauges in the form of an effective mass-like behaviour. In the present work we propose an analytic understanding of this phenomenon in terms of gluon condensation through a dynamical version of the Higgs mechanism, leading to the emergence of color condensates. Within the functional renormalisation group approach we compute the effective potential of covariantly constant field strengths, whose non-trivial minimum is related to the color condensates. In the physical case of an SU(3) gauge group this is an octet condensate. The value of the gluon mass obtained through this procedure compares very well to lattice results and the mass gap arising from alternative dynamical scenarios.

    hep-phhep-thSciPost Phys.(2022)·40 citations
12. 12*

    QED Meson Description of the X17 and Other Anomalous Particles

    Cheuk-Yin Wong🇺🇸

    The X17 particle, the E38 particle, and the anomalous soft photons are anomalous particles because they do not appear to belong to any known Standard Model families. We propose a QED meson description of the anomalous particles as composite systems of a light quark and a light antiquark bound and confined by the compact QED interaction, by combining Polyakov's transverse confinement of opposite electric charges in compact QED in (2+1)D and Schwinger's longitudinal confinement for massless opposite electric charges in QED in (1+1)D. With predicted QED meson masses close to the observed X17 and E38 masses, QED mesons may be good candidates for the description of the anomalous particles.

    hep-phnucl-thpublished in page 36-40 of Workshop Proce…·14 citations
13. 13*

    Towards a single scale-dependent Pomeron in holographic light-front QCD

    Hans Günter Dosch🇩🇪 · Guy F. de Téramond🇨🇷 · Tianbo Liu🇨🇳 · Raza Sabbir Sufian🇺🇸 · Stanley J. Brodsky🇺🇸 · Alexandre Deur🇺🇸

    The Pomeron Regge trajectory underlies the dynamics dependence of hadronic total cross sections and diffractive reactions at high energies. The physics of the Pomeron is closely related to the gluon distribution function and the gluon gravitational form factor of the target hadron. In this article we examine the scale dependence of the nonperturbative gluon distribution in the nucleon and the pion which was derived in a previous article [Phys. Rev. D 104, 114005 (2021)] in the framework of holographic light-front QCD and the Veneziano model. We argue that the QCD evolution of the gluon distribution function $g(x,\mu )$ to large ${\mu }^2$ leads to a single scale-dependent Pomeron. The resulting Pomeron trajectory ${\alpha }_P(t,\mu )$ not only depends on the momentum transfer squared $t$, but also on the physical scale $\mu$ of the amplitude, such as the virtuality $Q^2$ of the interacting photon in inclusive diffractive electroproduction. This can explain not only the $Q^2$ evolution of the proton structure function $F_2(x,Q^2)$ at small $x$, but also the observed energy and $Q^2$ dependence of high energy diffractive processes involving virtual photons up to LHC energies.

    hep-phhep-latPRD(2022)·12 citations
14. 14*

    Flavorful Electroweak Precision Observables in the Standard Model Effective Field Theory

    Sally Dawson🇺🇸 · Pier Paolo Giardino🇪🇸

    Electroweak precision observables (EWPO) measured at the W and Z poles provide stringent limits on possible beyond the Standard Model physics scenarios. In an effective field theory (EFT) framework, the next-to-leading order QCD and electroweak results for EWPO yield indirect limits on possible 4-fermion operators that do not contribute to the observables at tree level. Here we calculate the next-to-leading corrections to EWPO induced by flavor non-universal 4-fermion interactions and find that the extracted limits on EFT coefficients have a strong dependence on the flavor structure of the 4-fermion operators.

    hep-phPRD(2022)·54 citations
15. 15*

    Rapidity dependence of initial state geometry and momentum correlations in p+Pb collisions

    Bjoern Schenke🇺🇸 · Soeren Schlichting🇩🇪 · Pragya Singh🇫🇮

    Event geometry and initial state correlations have been invoked as possible explanations of long range azimuthal correlations observed in high multiplicity p+p and p+Pb collisions. We study the rapidity dependence of initial state momentum correlations and event-by-event geometry in $\sqrt{s}=5.02\mathrm{TeV}$ p+Pb collisions within the 3+1D IP-Glasma model~\cite{Schenke:2016ksl}, where the longitudinal structure is governed by JIMWLK rapidity evolution of the incoming nuclear gluon distributions. We find that the event geometry is correlated across large rapidity intervals whereas initial state momentum correlations are relatively short range in rapidity. Based on our results, we discuss implications for the relevance of both effects in explaining the origin of collective phenomena in small systems.

    ↳ nucl-thhep-phPRD(2022)·37 citations
16. 16*

    Is the Hubble crisis connected with the extinction of dinosaurs?

    Leandros Perivolaropoulos🇬🇷

    It has recently been suggested that a gravitational transition of the effective Newton's constant $G_{\mathrm{eff}}$ by about 10%, taking place 50-150 Myrs ago, can lead to the resolution of both the Hubble crisis and the growth tension of the standard $\Lambda$CDM model. Hints for such an abrupt transition with weaker gravity at times before the transition, have recently been identified in Tully Fisher galactic mass-velocity data and also in Cepheid SnIa calibrator data. Here we use Monte-Carlo simulations to show that such a transition could significantly increase (by a factor of 3 or more) the number of long period comets (LPCs) impacting the solar system from the Oort cloud (semi-major axis of orbits $\gtrsim 10^{4}AU$). This increase is consistent with observational evidence from the terrestrial and lunar cratering rates indicating that the impact flux of kilometer sized objects increased by at least a factor of 2 over that last 100 Myrs compared to the long term average. This increase may also be connected with the Chicxulub impactor event that produced the Cretaceous-Tertiary (K-T) extinction of 75% of life on Earth (including dinosaurs) about 66 Myrs ago. We use Monte-Carlo simulations to show that for isotropic Oort cloud comet distribution with initially circular orbits, random velocity perturbations (induced eg by passing stars and/or galactic tidal effects), lead to a deformation of the orbits that increases significantly when $G_{\mathrm{eff}}$ increases. A 10% increase of $G_{\mathrm{eff}}$ leads to an increase in the probability of the comets to enter the loss cone and reach the planetary region (pericenter of less than 10AU) by a factor that ranges from 5% (for velocity perturbation much smaller than the comet initial velocity) to more than 300% (for total velocity perturbations comparable with the initial comet velocity).

    ↳ astro-ph.EPastro-ph.COastro-ph.GAgr-qc+2Universe(2022)·36 citations
17. 17*

    A Note on the Abundance of Primordial Black Holes: Use and Misuse of the Metric Curvature Perturbation

    V. De Luca🇨🇭 · A. Riotto🇨🇭

    The formation of Primordial Black Holes (PBHs) through the collapse of large fluctuations in the early universe is a rare event. This manifests itself, for instance, through the non-Gaussian tail of the formation probability. To compute such probability and the abundance of PBHs, the curvature perturbation is frequently adopted. In this note we emphasize that its use does not provide the correct PBH formation probability. Through a path-integral approach we show that the exact calculation of the PBH abundance demands the knowledge of multivariate joint probabilities of the curvature perturbation or, equivalently, of all the corresponding connected correlators.

    ↳ astro-ph.COgr-qchep-phPLB(2022)·42 citations
18. 18*

    ${\rm Y}$ and ${\eta }_b$ mass shifts in nuclear matter and the nucleus bound states

    G. N. Zeminiani🇧🇷

    The ${\rm Y}$ and ${\eta }_b$ as well as $B^{\ast }$ meson mass shifts (scalar potentials) are estimated for the first time in symmetric nuclear matter. The main interest is, whether or not the strengths of the bottomonium-nuclear matter and charmonium-nuclear matter interactions are similar or very different, in the range of a few tens of MeV at the nuclear matter saturation density. This is because, each (${\rm Y},J/\Psi$) and (${\eta }_c,{\eta }_b$) meson group is usually assumed to have very similar properties based on the heavy charm and bottom quark masses. The estimate for the ${\rm Y}$ is made using an SU(5) effective Lagrangian density, by studying the $BB$, $B{B}^{\ast }$, and $B^{\ast }{B}^{\ast }$ meson loop contributions for the self-energy in free space and in nuclear medium. As a result, only the $BB$ meson loop contribution is included as our minimal prediction. As for the ${\eta }_b$, is included only the $B{B}^{\ast }$ meson loop contribution in the self-energy, to be consistent with the minimal prediction for the ${\rm Y}$. The in-medium masses of the $B$ and $B^{\ast }$ mesons appearing in the self-energy loops are calculated by the quark-meson coupling model. Form factors are used to regularize the loop integrals with a wide range of the cutoff mass values. The results suggest that both ${\rm Y}$ and ${\eta }_b$ should form bound states with a variety of nuclei considered in this study, for which the ${\rm Y}$-nucleus and ${\eta }_b$-nucleus bound state energies are calculated. The results also show an appreciable difference between the bottomonium-nuclear matter and charmonium-nuclear matter interaction strengths. Are also studied the ${\rm Y}$ and ${\eta }_b$ mass shifts in a heavy quark (heavy meson) symmetry limit. In addition, an initial study was done to investigate the influence of the choice of the form factor on our predictions.

    ↳ nucl-thhep-exhep-phnucl-ex5 citations
19. 19*

    Pion and Kaon Distribution Amplitudes from Lattice QCD

    Jun Hua🇨🇳 · Min-Huan Chu🇨🇳 · Jin-Chen He🇨🇳 · Xiangdong Ji🇺🇸 · Andreas Schäfer🇩🇪 · Yushan Su🇺🇸 · Peng Sun🇨🇳 · Wei Wang🇨🇳 · Ji Xu🇨🇳 · Yi-Bo Yang🇨🇳 · Fei Yao🇨🇳 · Jian-Hui Zhang🇨🇳 · Qi-An Zhang🇨🇳

    We present the state-of-the-art lattice QCD calculation of the pion and kaon light-cone distribution amplitudes (DAs) using large-momentum effective theory. The calculation is done at three lattice spacings $a\approx \{0.06,0.09,0.12\}$ fm and physical pion and kaon masses, with the meson momenta $P_z=\{1.29,1.72,2.15\}$ GeV. The result is non-perturbatively renormalized in a recently proposed hybrid scheme with self renormalization, and extrapolated to the continuum as well as the infinite momentum limit. We find a significant deviation of the pion and kaon DAs from the asymptotic form, and a large $SU(3)$ flavor breaking effect in the kaon DA.

    ↳ hep-lathep-phPRL(2022)·111 citations
20. 20*

    Squeezing Cosmological Phase Transitions with International Pulsar Timing Array

    Deng Wang🇨🇳

    A first-order MeV-scale cosmological phase transition (PT) can generate a peak in the power spectrum of stochastic gravitational wave background around nanohertz frequencies. With the recent International Pulsar Timing Array data release two covering nanohertz frequencies, we search for such a phase transition signal. For the standard 4-parameter PT model, we obtain the PT temperature $T_{\star }\in$ [66 MeV, 30 GeV], which indicates that dark or QCD phase transitions occurring below 66 MeV have been ruled out at $2\sigma$ confidence level. This constraint is much tighter than $T_{\star }\sim$ [1 MeV, 100 GeV] from NANOGrav. We also give much tighter $2\sigma$ bounds on the PT duration $H_{\star }/\beta >0.1$, strength ${\alpha }_{\star }>0.39$ and friction $\eta <2.74$ than NANOGrav. For the first time, we find a positive correlation between ${\log }_{10}{T}_{\star }$ and ${\log }_{10}{H}_{\star }/\beta$ implying that PT temperature increases with increasing bubble nucleation rate. To avoid large theoretical uncertainties in calculating PT spectrum, we make bubble spectral shape parameters $a$, $b$, $c$ and four PT parameters free together, and confront this model with data. We find that pulsar timing is very sensitive to the parameter $a$, and give the first clear constraint $a=1.27_{-0.54}^{+0.71}$ at $1\sigma$ confidence level.

    ↳ astro-ph.COgr-qchep-phhep-th11 citations
21. 21*

    Long and short distance behavior of the imaginary part of the heavy-quark potential

    Kirill Boguslavski🇦🇹 · Babak Kasmaei🇺🇸 · Michael Strickland🇺🇸

    The imaginary part of the effective heavy-quark potential is related to the total in-medium decay width of heavy quark-antiquark bound states. We extract the static limit of this quantity using classical-statistical simulations of real-time Yang-Mills dynamics by measuring the temporal decay of Wilson loops. By performing the simulations on finer and larger lattices, we are able to show that the nonperturbative results follow the same form as the perturbative ones. For large quark-antiquark separations, we quantify the magnitude of the non-perturbative long-range corrections to the imaginary part of the heavy-quark potential. We present our results for a wide range of temperatures, lattice spacings, and lattice volumes. We also extract approximations for the short-distance behavior of the classical potential.

    ↳ hep-lathep-phnucl-thEPJ Web Conf.(2022)·0 citations
22. 22*

    Effective electromagnetic actions for Lorentz violating theories exhibiting the axial anomaly

    A. Gómez🇲🇽 · A. Martín-Ruiz🇲🇽 · L. F. Urrutia🇲🇽

    The CPT odd contribution to the effective electromagnetic action deriving from the vacuum polarization tensor in a large class of fermionic systems exhibiting Lorentz invariance violation (LIV) is calculated using thermal field theory methods, focusing upon corrections depending on the chemical potential. The systems considered exhibit the axial anomaly and their effective actions are described by axion electrodynamics whereby all the LIV parameters enter in the coupling $\Theta (x)$ to the unmodified Pontryagin density. A preliminary application to type-I tilted Weyl semimetals is briefly presented.

    ↳ hep-thcond-mat.mes-hallhep-phPLB(2022)·25 citations
23. 23*

    Electromagnetic anomaly in the presence of electric and chiral magnetic conductivities in relativistic heavy-ion collisions

    Irfan Siddique🇨🇳 · Shanshan Cao🇨🇳 · Uzma Tabassam🇵🇰 · Mohsin Saeed🇵🇰 · Muhammad Waqas🇨🇳

    We study the spacetime evolution of electric $(\text{E})$ and magnetic $(\text{B})$ fields along with the electromagnetic anomaly $(\text{E}\cdot \text{B})$ in the presence of electric ($\sigma$) and chiral magnetic (${\sigma }_{\chi }$) conductivities in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=200$~GeV. By comparing to the Lienard-Wiechert solutions with zero conductivities, we observe a symmetry breaking of the electromagnetic field in a conducting medium with respect to the reaction plane. The decay of the field is also significantly decelerated after the conductivities are introduced. Similar effects are also found for the dipole structure of $\text{E}\cdot \text{B}$ as well as the quadrupole structure of $(\text{E}\cdot \text{B})\text{B}$, which may finally affect the charge separation of the elliptic flow coefficient of hadrons observed in high-energy nuclear collisions.

    ↳ nucl-thhep-phnucl-exPRC(2022)·14 citations
24. 24*

    LIBAMI: Implementation of Algorithmic Matsubara Integration

    Hossam Elazab🇨🇦 · B. D. E. McNiven🇨🇦 · J. P. F. LeBlanc🇨🇦

    We present libami, a lightweight implementation of algorithmic Matsubara integration (AMI) written in C++. AMI is a tool for analytically resolving the sequence of nested Matsubara integrals that arise in virtually all Feynman perturbative expansions.

    ↳ cond-mat.str-elhep-phhep-thphysics.comp-phComput.Phys.Commun.(2022)·3 citations
25. 25*

    Quantum vacuum processes in the extremely intense light of relativistic plasma mirror sources

    Antonin Sainte-Marie🇫🇷 · Luca Fedeli🇫🇷 · Neïl Zaïm🇫🇷 · Felix Karbstein🇩🇪 · Henri Vincenti🇫🇷

    The advent of Petawatt-class laser systems allows generating electro-magnetic fields of unprecedented strength in a controlled environment, driving increasingly more efforts to probe yet unobserved processes through their interaction with the quantum vacuum. Still, the lowest intensity scale governing these effects lies orders of magnitude beyond foreseen capabilities, so that such endeavor is expected to remain extremely challenging. In recent years, however, plasma mirrors have emerged as a promising bridge across this gap, by enabling the conversion of intense infrared laser pulses into coherently focused Doppler harmonic beams lying in the X-UV range. In this work, we present quantitative predictions on the quantum vacuum signatures produced when such beams are focused to intensities between $10^{24}$ and $10^{28}{W.cm}^{-2}$ . These signatures, which notably include photon-photon scattering and electron-positron pair creation, are obtained using state-of-the-art massively parallel numerical tools. In view of identifying experimentally favorable configurations, we also consider the coupling of the focused harmonic beam with an auxiliary optical beam, and provide comparison with other established schemes. Our results show that a single coherently focused harmonic beam can produce as much scattered photons as two infrared pulses in head-on collision, and confirm that the coupling of the harmonic beam to an auxiliary beam gives rise to significant levels of inelastic scattering, and hence holds the potential to strongly improve the attainable signal to noise ratios in experiments.

    ↳ physics.opticshep-phphysics.plasm-phNew J.Phys.(2022)·10 citations
26. 26*

    Low-Energy Supernovae Severely Constrain Radiative Particle Decays

    Andrea Caputo (1,2) · Hans-Thomas Janka (3) · Georg Raffelt (4) · Edoardo Vitagliano (5) · ((1) Tel Aviv University, (2) Weizmann Institute, Rehovot, (3) MPI for Astrophysics, Garching, (4) MPI for Physics, Munich, (5) UCLA, Los Angeles)

    The hot and dense core formed in the collapse of a massive star is a powerful source of hypothetical feebly-interacting particles such as sterile neutrinos, dark photons, axion-like particles (ALPs), and others. Radiative decays such as $a\to 2\gamma$ deposit this energy in the surrounding material if the mean free path is less than the radius of the progenitor star. For the first time, we use a supernova (SN) population with particularly low explosion energies as the most sensitive calorimeters to constrain this possibility. These SNe are observationally identified as low-luminosity events with low ejecta velocities and low masses of ejected ${}^{56}$Ni. Their low energies limit the energy deposition from particle decays to less than about 0.1 B, where $1\mathrm{B}(\mathrm{bethe})=10^{51}\mathrm{erg}$. For 1-500 MeV-mass ALPs, this generic argument excludes ALP-photon couplings $G_{a\gamma \gamma }$ in the $10^{-10}$-$10^{-8}{\mathrm{GeV}}^{-1}$ range.

    ↳ astro-ph.HEastro-ph.COhep-phPRL(2022)·200 citations
27. 27*

    Limits on axions and axionlike particles within the axion window using a spin-based amplifier

    Yuanhong Wang · Haowen Su🇺🇸 · Min Jiang🇨🇳 · Ying Huan · Yushu Qin🇨🇳 · Chang Guo🇨🇳 · Zehao Wang · Dongdong Hu🇨🇳 · Wei Ji🇩🇪 · Pavel Fadeev🇩🇪 · Xinhua Peng🇨🇳 · Dmitry Budker🇩🇪

    Searches for the axion and axionlike particles may hold the key to unlocking some of the deepest puzzles about our universe, such as dark matter and dark energy. Here we use the recently demonstrated spin-based amplifier to constrain such hypothetical particles within the well-motivated ``axion window'' (1 $\mu$eV-1 meV) through searching for an exotic spin-spin interaction between polarized electron and neutron spins. The key ingredient is the use of hyperpolarized long-lived ${}^{129}$Xe nuclear spins as an amplifier for the pseudomagnetic field generated by the exotic interaction. Using such a spin sensor, we obtain a direct upper bound on the product of coupling constants $g_p^e{g}_p^n$. The spin-based amplifier technique can be extended to searches for a wide variety of hypothetical particles beyond the Standard Model.

    ↳ physics.ins-dethep-exhep-phPRL(2022)·40 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.