Mon·Oct 23, 2023Monday·October 23, 2023

1. 01*

   Radiation from a gluon-gluino colour-singlet dipole at N${}^3$LO

   Xuan Chen🇨🇳 · Petr Jakubčík🇨🇭 · Matteo Marcoli🇨🇭 · Giovanni Stagnitto🇨🇭

   We compute the quantum chromodynamics (QCD) corrections to the decay of a neutralino to gluinos and partons at next-to-next-to-next-to-leading order (N${}^3$LO) in the strong coupling constant ${\alpha }_s$, integrated separately over the phase-space of two, three, four or five particles in the final state. The resulting matrix elements are related to the quark-gluon antenna functions, completing the set of integrated antenna functions in final-final kinematics required for the extension of the antenna subtraction scheme to N${}^3$LO. For a model with massless partons (quarks and gluons) and an arbitrary number of adjoint fermions, we obtained the following new results to $\mathcal{O}({\alpha }_s^3)$: the inclusive cross section for the decay of a neutralino, the renormalization of the effective coupling of a neutralino to a gluino and gluon(s), the gluino collinear anomalous dimension, the gluino contribution to the parton collinear anomalous dimensions and the neutralino-gluino-gluon(s) vertex form factors. A special case of this model is the $\mathcal{N}=1$ super Yang-Mills theory, where we can relate some of our findings to known results.

   hep-phhep-thJHEP(2023)·12 citations
2. 02*

   Reactor antineutrino flux and anomaly

   Chao Zhang🇺🇸 · Xin Qian🇺🇸 · Muriel Fallot🇫🇷

   Reactor antineutrinos have played a significant role in establishing the standard model of particle physics and the theory of neutrino oscillations. In this article, we review the reactor antineutrino flux and in particular the reactor antineutrino anomaly (RAA) coined over a decade ago. RAA refers to a deficit of the measured antineutrino inverse beta decay rates at very short-baseline reactor experiments compared to the theoretically improved predictions (i.e. the Huber-Mueller model). Since the resolution of several previous experimental anomalies have led to the discovery of non-zero neutrino mass and mixing, many efforts have been invested to study the origin of RAA both experimentally and theoretically. The progress includes the observation of discrepancies in antineutrino energy spectrum between data and the Huber-Mueller model, the re-evaluation of the Huber-Mueller model uncertainties, the potential isotope-dependent rate deficits, and the better agreement between data and new model predictions using the improved summation method. These developments disfavor the hypothesis of a light sterile neutrino as the explanation of RAA and supports the deficiencies of Huber-Mueller model as the origin. Looking forward, more effort from both the theoretical and experimental sides is needed to fully understand the root of RAA and to make accurate predictions of reactor antineutrino flux and energy spectrum for future discoveries.

   hep-phhep-exnucl-exPPNP(2024)·33 citations
3. 03*

   Describing the speed of sound peak of isospin-asymmetric cold strongly interacting matter using effective models

   Alejandro Ayala🇲🇽 · Bruno S. Lopes🇧🇷 · Ricardo L. S. Farias🇧🇷 · Luis C. Parra🇲🇽

   The non-monotonic behavior of the speed of sound for isospin imbalanced strongly interacting matter, found by recent lattice QCD simulations, can be reproduced within the Nambu--Jona-Lasinio model and Linear Sigma Model with quarks when the couplings become isospin chemical potential-dependent. The introduction of medium-dependent couplings can potentially affect the equivalence between the thermodynamic relations and their definitions from statistical mechanics. We describe the procedure to compensate for the introduction of medium-dependent couplings to preserve the correct thermodynamic identities. We find the isospin chemical potential dependence for the couplings from the isospin density LQCD data and, after finding the compensating function to correctly describe the pressure, we show that the description of the square of the speed of sound reported by LQCD is well reproduced when using the found medium-dependent couplings in both models.

   hep-phhep-lathep-thnucl-thEPJA(2024)·16 citations
4. 04*

   Short Baseline Neutrino Anomalies at Stopped Pion Experiments

   Iain A. Bisset🇺🇸 · Bhaskar Dutta🇺🇸 · Wei-Chih Huang🇺🇸 · Louis E. Strigari🇺🇸

   Stopped-pion experiments that measure coherent elastic neutrino-nucleus scattering (CE$\nu$NS) are sensitive to sterile neutrinos via disappearance. Using timing and energy spectra to perform flavor decomposition, we show that the delayed electron neutrino component provides an independent test of short-baseline anomalies that hint at $\sim$ eV-mass sterile neutrinos. Dedicated experiments will be sensitive to nearly the entire sterile neutrino parameter space consistent with short-baseline data.

   hep-phJHEP(2024)·5 citations
5. 05*

   NuHepMC: A standardized event record format for neutrino event generators

   S. Gardiner🇺🇸 · J. Isaacson🇺🇸 · L. Pickering🇬🇧

   Simulations of neutrino interactions are playing an increasingly important role in the pursuit of high-priority measurements for the field of particle physics. A significant technical barrier for efficient development of these simulations is the lack of a standard data format for representing individual neutrino scattering events. We propose and define such a universal format, named NuHepMC, as a common standard for the output of neutrino event generators. The NuHepMC format uses data structures and concepts from the HepMC3 event record library adopted by other subfields of high-energy physics. These are supplemented with an original set of conventions for generically representing neutrino interaction physics within the HepMC3 infrastructure.

   hep-phhep-exSciPost Phys.Codeb.(2025)·5 citations
6. 06*

   A model for time-evolution of coupling constants

   Taekoon Lee🇰🇷

   A general model is proposed for time-varying coupling constants in field theory, assuming the ultraviolet cutoff is a varying entity in the expanding universe. It is assumed that the cutoff depends on the scale factor of the universe and all bare couplings remain constant. This leads to varying renormalized coupling constants that evolve in proportion to the Hubble parameter. The evolution of the standard model constants is discussed.

   hep-phPLB(2024)·3 citations
7. 07*

   Study of neutrinoless double beta decay in the Standard Model extended with sterile neutrinos

   Debashree Priyadarsini Das🇮🇳 · Sasmita Mishra🇮🇳

   We study a model where the Standard Model is augmented with three sterile neutrinos. By adopting a particular parameterization of a $(6\times 6)$ unitary matrix - in this context, light neutrino masses being generated via a type-I seesaw mechanism - we analytically derive the masses of the sterile states using an exact seesaw relation. The masses of the sterile states are derived in terms of the lightest mass of active neutrinos and active-active and active-sterile mixing angles and phases; they can be all light, all heavy, or a mixture of light and heavy compared to the active states. This can be attributed to the interplay of the $CP$ violating (CPV) phases of the mixing matrix. As both active and sterile states can mediate the neutrinoless double beta decay ($0\nu \beta \beta$) process, their contributions to the effective mass of the electron neutrino, $|m_{ee}|$, become a function of the mass of the lightest active state and active-active and active-sterile mixing angles and phases. We explore the parameter space of $|m_{ee}|$, keeping in mind, the present and future sensitivity of $0\nu \beta \beta$ decay searches. By making use of constraints from charged lepton flavor violating (cLFV) processes and non-unitarity, we explore the role of additional CPV phases and active-sterile mixing angle values. The numerical values thus obtained for $|m_{ee}|$ can vary from as low as $\mathcal{O}(10^{-4})$ to saturating the present experimental limit. We check the reliability of our result by calculating the branching ratio of $\mu \to e\gamma$, a prominent cLFV process, and non-unitarity in this framework.

   hep-phEPJC(2024)·3 citations
8. 08*

   Tetraquark bound states in constituent quark models: benchmark test calculations

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

   We investigate the tetraquark bound states that are manifestly exotic using three distinct few-body methods: Gaussian Expansion Method (GEM), Resonating Group Method (RGM), and Diffusion Monte Carlo (DMC). We refer to manifestly exotic states that do not involve a mixture with the conventional mesons through the creation and annihilation of $n\bar{n}$, where $n=u,d$. Our calculations are conducted with two types of quark models: the pure constituent quark model featuring one-gluon-exchange interactions and confinement interactions, and the chiral constituent quark model, supplemented by extra one-boson-exchange interactions. This study represents a comprehensive benchmark test of various few-body methods and quark models. Our findings reveal the superiority of GEM over RGM and DMC methods based on present implements for the tetraquark bound states. Additionally, we observe a tendency for the chiral quark model to overestimate the binding energies. We systematically explore the fully, triply, doubly, and singly heavy tetraquark states with $J^P=0^{+},1^{+},2^{+}$, encompassing over 150 states in total. We successfully identify several bound states, including $[cc\bar{n}\bar{n}{]}_{J^P=1^{+}}^{I=0}$, $[bb\bar{n}\bar{n}{]}_{J^P=1^{+}}^{I=0}$, $[bc\bar{n}\bar{n}{]}_{J^P=0^{+},1^{+},2^{+}}^{I=0}$, $[bs\bar{n}\bar{n}{]}_{J^P=0^{+},1^{+}}^{I=0}$, $[cs\bar{n}\bar{n}{]}_{J^P=0^{+}}^{I=0}$, and $[bb\bar{n}\bar{s}{]}_{J^P=1^{+}}$, all found to be bound states below the dimeson thresholds.

   hep-phhep-exhep-latnucl-thPRD(2023)·51 citations
9. 09*

   $D_{s0}^{\ast }(2317)$ and $B_{s0}^{\ast }$ as molecular states

   Hee-Jin Kim🇰🇷 · Hyun-Chul Kim🇰🇷

   We investigate the dynamical generation of the $D_{s0}^{\ast }(2317)$ and $B_{s0}^{\ast }$ mesons using a meson-exchange model with a coupled-channelformalism. Our primary focus is on the $D_s^{+}{\pi }^0$ channel below the $DK$ threshold. First, we construct the invariant kernel amplitudes, incorporating effective Lagrangians based on heavy-quark symmetry, flavor SU(3) symmetry, and hidden local symmetry. Since the $D_{s0}^{\ast }(2317)$ state implies isospin symmetry breaking, we introduce ${\pi }^0-\eta$ isospin mixing. We subsequently solve the coupled-channel integral equations, which include four different channels, i.e., $D_s^{+}{\pi }^0$, $D^0{K}^{+}$, $D^{+}{K}^0$, and $D_s^{+}\eta$. We carefully analyze how the pole corresponding to the $D_{s0}^{\ast }(2317)$ state emerges from the coupled channels. Our findings reveal that the pole positions of the $D_{s0}^{\ast }(2317)$ meson are at $\sqrt{s_R}=(2317.9-i0.0593)$ MeV and the ${\bar{B}}_{s0}^{\ast }$ meson at $(5756.43-i0.0215)$ MeV, respectively. We also discuss their decay widths and destructive interference of the two sources. In conclusion, our current results provide a clear indication supporting the interpretation of the $D_{s0}^{\ast }(2317)$ meson as a $DK$ molecular state within the present coupled-channel formalism. In addition, we discuss a possible existence of ${\bar{B}}_{s0}^{\ast }$.

   hep-phhep-exPTEP(2024)·11 citations
10. 10*

    Phase structure and critical phenomena in 2-flavor QCD by holography

    Yan-Qing Zhao🇨🇳 · Song He🇨🇳 · Defu Hou🇨🇳 · Li Li🇨🇳 · Zhibin Li

    We explore the phase structure of Quantum Chromodynamics (QCD) with two dynamical quark flavors at finite temperature and baryon chemical potential, employing the non-perturbative gauge/gravity duality approach. Our gravitational model is tailored to align with state-of-the-art lattice data regarding the thermal properties of multi-flavor QCD. Following a rigorous parameter calibration to match equations of state and the QCD trace anomaly at zero chemical potential derived from cutting-edge lattice QCD simulations, we investigate thermodynamic quantities and order parameters. We predict the location of the critical endpoint (CEP) at $({\mu }_{\text{CEP}},T_{\text{CEP}})=(219,182)$ MeV at which a line of first-order phase transitions terminate. We compute critical exponents associated with the CEP and find that they almost coincide with the critical exponents of the quantum 3D Ising model.

    hep-phhep-thPRD(2024)·38 citations
11. 11*

    A cosmological sandwiched window for lepton-number breaking scale

    Shao-Ping Li🇨🇳 · Bingrong Yu🇨🇳

    A singlet majoron can arise from the seesaw framework as a pseudo-Goldstone boson when the heavy Majorana neutrinos acquire masses via the spontaneous breaking of global $\mathrm{U}(1{)}_L$ symmetry. The resulting cosmological impacts are usually derived from the effective majoron-neutrino interaction, and the majoron abundance is accumulated through the freeze-in neutrino coalescence. However, a primordial majoron abundance can be predicted in a minimal setup and lead to distinctive cosmological effects. In this work, we consider such a primordial majoron abundance from relativistic freeze-out and calculate the modification to the effective neutrino number $N_{\mathrm{eff}}$. We demonstrate that the measurements of $N_{\mathrm{eff}}$ will constrain the parameter space from a primordial majoron abundance in an opposite direction to that from neutrino coalescence. When the contributions from both the primordial abundance and the freeze-in production coexist, the $\mathrm{U}(1{)}_L$-breaking scale (seesaw scale) $f$ will be pushed into a ''sandwiched window''. Remarkably, for majoron masses below 1 MeV and above the eV scale, the future CMB-S4 experiment will completely close such a low-scale seesaw window for $f\in [1,10^5]\mathrm{GeV}$. We highlight that any new light particle with a primordial abundance that couples to SM particles may lead to a similar sandwiched window, and such a general phenomenon deserves careful investigation.

    hep-phastro-ph.COJCAP(2024)·5 citations
12. 12*

    Light mass window of inert doublet dark matter with lepton portal interaction

    Ryo Higuchi🇯🇵 · Syuhei Iguro🇩🇪 · Shohei Okawa🇪🇸 · Yuji Omura🇯🇵

    We study phenomenology of a light scalar dark matter (DM). In the model, there are an inert doublet scalar and a singlet Dirac fermion $\psi$, both charged under a global $Z_2$ symmetry. The mass of the lightest inert scalar $H$ can be lighter than 10 GeV by imposing appropriate relations between three scalar quartic couplings. The lightest $Z_2$ odd particle is stable and DM. In this paper, focusing on the parameter space where $H$ is lighter than $\psi$ and is DM, we discuss DM physics related to relic density, direct detection, indirect detection, collider searches and other cosmological observations. We clarify differences from the case where $\psi$ is instead DM, which has been focused on in the previous works.

    hep-phastro-ph.HEhep-exPRD(2024)·5 citations
13. 13*

    A new purpose for the $W$-boson mass measurement: searching for New Physics in lepton+$MET$

    Kaustubh Agashe🇺🇸 · Sagar Airen🇺🇸 · Roberto Franceschini🇮🇹 · Doojin Kim🇺🇸 · Ashutosh V. Kotwal🇺🇸 · Lorenzo Ricci🇺🇸 · Deepak Sathyan🇺🇸

    We show that the $m_W$ measurement is a direct probe of New Physics (NP) contributing to lepton and missing transverse momentum ($\ell +MET$), independently from indirect tests via the electroweak fit. Such NP modifies the kinematic distributions used to extract $m_W$, necessitating a simultaneous fit to $m_W$ and NP. This effect can in principle bias the $m_W$ measurement, but only to a limited extent for our considered models. Given that, we demonstrate that the agreement at high-precision with SM-predicted shapes results in bounds competitive to, if not exceeding, existing ones for two examples: anomalous $W$ decay involving a $L_{\mu }-L_{\tau }$ gauge boson and ${\tilde{\nu }}_l\tilde{l}$ production in the MSSM.

    hep-phhep-exPLB(2024)·6 citations
14. 14*

    Dark Sector Glueballs at the LHC

    Austin Batz🇺🇸 · Timothy Cohen🇨🇭 · David Curtin🇨🇦 · Caleb Gemmell🇨🇦 · Graham D. Kribs🇺🇸

    We study confining dark sectors where the lightest hadrons are glueballs. Such models can provide viable dark matter candidates and appear in some neutral naturalness scenarios. In this work, we introduce a new phenomenological model of dark glueball hadronization inspired by the Lund string model. This enables us to make realistic predictions for dark glueball phenomenology at the LHC for the first time. Our model reproduces the expected thermal distribution of hadron species as an emergent consequence of hadronization dynamics. The ability to predict the production of glueball states heavier than the lightest species significantly expands the reach of long-lived glueball searches in MATHUSLA compared to previous simplified estimates. We also characterize regions of parameter space where emerging and/or semivisible jets could arise from pure-glue dark sectors, thereby providing new benchmark models that motivate searches for these signatures.

    hep-phJHEP(2024)·32 citations
15. 15*

    Polarized $J/\psi$ production in semi-inclusive DIS at large $Q^2$: Comparing quark fragmentation and photon-gluon fusion

    Marston Copeland🇺🇸 · Sean Fleming🇺🇸 · Rohit Gupta🇺🇸 · Reed Hodges🇺🇸 · Thomas Mehen🇺🇸

    We compare the relative importance of different mechanisms for polarized $J/\psi$ production in semi-inclusive deep inelastic scattering processes at large $Q^2$. The transverse momentum dependent (TMD) factorization framework and nonrelativistic quantum chromodynamics are used to study the leading contributions from light quark fragmentation to polarized $J/\psi$, and compared to direct production via photon-gluon fusion, which can proceed through color-singlet as well as color-octet mechanisms. We identify kinematic regimes where light quark fragmentation dominates, allowing for the extraction of the ${}^3{S}_1^{[8]}$ matrix element, as well as regimes where photon gluon fusion dominates, suggesting that the gluon TMD parton distribution function can be probed.

    hep-phPRD(2024)·19 citations
16. 16*

    Spectral distortions from promising single and multifield inflationary models

    Alexander Baur🇩🇪 · Marcos A.G. Garcia🇲🇽 · Raul Henriquez-Ortiz🇸🇻 · Mauricio Hernandez-Neri🇲🇽 · Saul Ramos-Sanchez🇲🇽

    Forthcoming missions probing the absolute intensity of the CMB are expected to be able to measure spectral distortions, which are deviations from its blackbody distribution. As cosmic inflation can induce spectral distortions, these experiments offer a possibility to further test the various promising inflationary proposals, whose predictions need to be carefully determined. After numerically fitting all inflationary observables to match current observations, we compute the predicted spectral distortions of various promising single and multifield inflationary models. The predictions of single-field inflationary models display deviations between 0.5% and 20% with respect to the standard cosmological model in the observable window, where multi-natural and axion-monodromy inflation stand out in this respect. In the case of multifield inflation, we observe a richer structure of the power spectrum, which, in the case of so-called hybrid attractors, yields spectral distortions about 100 times more intense than the standard signal. These observations open up questions about the relation among our results and other cosmological observables that are also to be probed soon, such as the production of primordial black holes and gravitational waves.

    ↳ astro-ph.COhep-phJCAP(2024)·8 citations
17. 17*

    Amplitude analysis of vector-pseudoscalar final states at GlueX

    Amy M. Schertz (Indiana University, for the GlueX Collaboration)🇺🇸

    Excited vector mesons, some of which are predicted to include gluonic excitation in their wavefunctions, and certain classes of axial vector mesons, some of which are implicated in the decay of spin-exotic mesons, decay dominantly to vector-pseudoscalar final states. In particular, the axial vector $b_1(1235)$ decays dominantly to $\omega \pi$, and is produced copiously at the GlueX experiment. It provides a testing ground to explore strategies for amplitude analysis of further vector-pseudoscalar channels where the intermediate resonances may be harder to isolate. The formalism for amplitude analysis of $b_1^{-}$ production via charge exchange with a recoiling ${\Delta }^{++}$ is presented here, and compared with the proton recoil case. A strategy for a systematic analysis of reactions involving ${\Delta }^{++}$ recoil is outlined.

    ↳ nucl-exhep-exhep-phNuovo Cim.C(2024)·0 citations
18. 18*

    Generalized Parton Distributions from Lattice QCD with Asymmetric Momentum Transfer: Axial-vector case

    Shohini Bhattacharya🇺🇸 · Krzysztof Cichy🇵🇱 · Martha Constantinou🇺🇸 · Jack Dodson🇺🇸 · Xiang Gao🇺🇸 · Andreas Metz🇺🇸 · Joshua Miller🇺🇸 · Swagato Mukherjee🇺🇸 · Peter Petreczky🇺🇸 · Fernanda Steffens🇩🇪 · Yong Zhao🇺🇸

    Recently, we made significant advancements in improving the computational efficiency of lattice QCD calculations for Generalized Parton Distributions (GPDs). This progress was achieved by adopting calculations of matrix elements in asymmetric frames, deviating from the computationally-expensive symmetric frame typically used, and allowing freedom in the choice for the distribution of the momentum transfer between the initial and final states. A crucial aspect of this approach involves the adoption of a Lorentz covariant parameterization for the matrix elements, introducing Lorentz-invariant amplitudes. This approach also allows us to propose an alternative definition of quasi-GPDs, ensuring frame independence and potentially reduce power corrections in matching to light-cone GPDs. In our previous work, we presented lattice QCD results for twist-2 unpolarized GPDs ($H$ and $E$) of quarks obtained from calculations performed in asymmetric frames at zero skewness. Building upon this work, we now introduce a novel Lorentz covariant parameterization for the axial-vector matrix elements. We employ this parameterization to compute the axial-vector GPD $\tilde{H}$ at zero skewness, using an $N_f=2+1+1$ ensemble of twisted mass fermions with clover improvement. The light-quark masses employed in our calculations correspond to a pion mass of approximately 260 MeV.

    ↳ hep-lathep-exhep-phhep-thPRD(2024)·46 citations
19. 19*

    Primordial Origin of Supermassive Black Holes from Axion Bubbles

    Kentaro Kasai🇯🇵 · Masahiro Kawasaki🇯🇵 · Naoya Kitajima🇯🇵 · Kai Murai🇯🇵 · Shunsuke Neda🇯🇵 · Fuminobu Takahashi🇯🇵

    We study a modification of the primordial black hole (PBH) formation model from axion bubbles. We assume that the Peccei-Quinn scalar rolls down in the radial direction from a large field value to the potential minimum during inflation, which suppresses the axion fluctuations and weakens the clustering of PBHs on large scales. We find that the modified model can produce a sufficient number of PBHs that seed the supermassive black holes while avoiding the observational constraints from isocurvature perturbations and angular correlation of the high-redshift quasars.

    ↳ astro-ph.COhep-phJCAP(2024)·9 citations
20. 20*

    Structure-dependent electromagnetic finite-volume effects through order $1/L^3$

    Matteo Di Carlo🇬🇧 · Maxwell T. Hansen🇬🇧 · Nils Hermansson-Truedsson🇸🇪 · Antonin Portelli🇬🇧

    We consider electromagnetic finite-volume effects through order $1/L^3$ in different formulations of QED, where $L$ is the periodicity of the spatial volume. An inherent problem at this order is the appearance of structure-dependent quantities related to form factors and the analytical structure of the correlation functions. The non-local constraint of the widely used QED${}_{\text{L}}$ regularization gives rise to structure-dependent effects that are difficult to evaluate analytically and can act as a precision bottleneck in lattice calculations. For this reason, we consider general volume expansions relevant for the mass spectrum as well as leptonic decay rates in QED${}_{\text{C}}$, QED${}_{\text{L}}$ and QED${}_{\text{L}}^{\text{IR}}$, the latter being a class of non-local formulations generalising QED${}_{\text{L}}$. One choice within this class is QED${}_{\text{r}}$, first introduced at this conference, and we show that the effects of non-locality for the $1/L^3$ term in the expansion can be removed. We observe that there are still $1/L^3$ contributions unrelated to the (non-)locality of the studied QED formulations, but rather to collinear singularities in the physical amplitudes.

    ↳ hep-lathep-phPoS(2024)·11 citations
21. 21*

    Pseudo-scalar meson spectral properties in the chiral crossover region of QCD

    Dibyendu Bala🇩🇪 · Olaf Kaczmarek🇩🇪 · Peter Lowdon🇩🇪 · Owe Philipsen🇩🇪 · Tristan Ueding🇩🇪

    Determining the type of excitations that can exist in a thermal medium is key to understanding how hadronic matter behaves at extreme temperatures. In this work we study this question for pseudo-scalar mesons comprised of light-strange and strange-strange quarks, analysing how their low-energy spectral properties are modified as one passes through the high-temperature chiral crossover region between $T=145.6\text{MeV}$ and $172.3\text{MeV}$. We utilise the non-perturbative constraints satisfied by correlation functions at finite temperature in order to extract the low-energy meson spectral function contributions from spatial correlator lattice data in $N_f=2+1$ flavour QCD. The robustness of these contributions are tested by comparing their predictions with data for the corresponding temporal correlator at different momentum values. We find that around the pseudo-critical temperature $T_{\text{pc}}$ the data in both the light-strange and strange-strange channels is consistent with the presence of a distinct stable particle-like ground state component, a so-called thermoparticle excitation. As the temperature increases this excitation undergoes collisional broadening, and this is qualitatively the same in both channels. These findings suggest that pseudo-scalar mesons in QCD have a bound-state-like structure at low energies within the chiral crossover region which is still strongly influenced by the vacuum states of the theory.

    ↳ hep-lathep-phhep-thnucl-thJHEP(2024)·26 citations
22. 22*

    On Q-balls in Anti de Sitter Space

    Arvind Rajaraman🇺🇸 · Alexander Stewart🇺🇸 · Christopher B. Verhaaren🇺🇸

    We perform a general analysis of thin-wall Q-balls in AdS space. We provide numeric solutions and highly accurate analytic approximations over much of the parameter space. These analytic solutions show that AdS Q-balls exhibit significant differences from the corresponding flat space solitons. This includes having a maximum radius beyond which the Q-balls are unstable to a new type of state where the Q-ball coexists with a gas of massive particles. The phase transition to this novel state is found to be a zero-temperature third-order transition. This, through the AdS/CFT correspondence, has implications for a scalar condensate in the boundary theory.

    ↳ hep-thhep-phPRD(2024)·3 citations
23. 23*

    Dispersion and absorption effects in the linearized Euler-Heisenberg electrodynamics under an external magnetic field

    G. R. Santos🇧🇷 · M. J. Neves🇧🇷

    The effects of the Ohmic and magnetic density currents are investigated in the linearized Euler-Heisenberg electrodynamics. The linearization is introduced through an external magnetic field, in which the vector potential of the Euler-Heisenberg electrodynamics is expanded around of a magnetic background field, that we consider uniform and constant in this paper. From the Euler-Heisenberg linearized equations, we obtain the solutions for the refractive index associated with the electromagnetic wave superposition, when the current density is ruled by the Ohm law, and in the second case, when the current density is set by a isotropic magnetic conductivity. These solutions are functions of the magnetic background $(\mathbf{B})$, of the wave propagation direction $(\mathbf{k})$, it also depends on the conductivity, and on the wave frequency. As consequence, the dispersion and the absorption of plane waves change when $\mathbf{B}$ is parallel to $\mathbf{k}$ in relation to the case of $\mathbf{B}$ perpendicular to $\mathbf{k}$ in the medium. The characteristics of the refraction index related to directions of $\mathbf{B}$ and of the wave polarization open a discussion for the birefringence in this medium.

    ↳ physics.class-phhep-phhep-thphysics.opticsInt.J.Mod.Phys.A(2024)·3 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.