Thu·Nov 23, 2023Thursday·November 23, 2023

1. 01*

   GPDs and gravitational form factors of nucleons (quark and gluon contributions)

   O.V. Selyugin🇷🇺 · O.V. Teryaev🇷🇺

   Taking into account the recent parameterizations of parton distribution functions (PDFs), % obtained in the recent time, the momentum transfer dependence of generalized parton distributions (GPDs) of nucleons is obtained in the limit $\xi \to 0$. The gravitational quark and gluon form factors of nucleons are calculated. It is shown that the gluon gravitational radius of the nucleon is comparable to the electromagnetic radius of the proton. The power dependence of form factors is investigated. As a result, it was obtained that the quark gravitational form factor is reproduced by the dipole form, while the form of the gluon gravitation form factor corresponds to the triple form.

   hep-phhep-exPhys.Atom.Nucl.(2024)·4 citations
2. 02*

   Modeling of Energy Distributions in Pseudo-Rest Frame Analyses of Two-Body Decays with Missing Particles

   J. A. Colorado-Caicedo🇲🇽 · C. Lizama-Garcia🇲🇽 · E. De La Cruz-Burelo🇲🇽

   In this study, we introduce a parametric function designed to describe the energy distribution of the observed particle within the framework of two-body decays involving one undetected particle, analyzed using the pseudo-rest frame approximation. While we illustrate its effectiveness through the specific case study of the Lepton Flavor Violating decay $\tau \to l+\alpha$, this parametric function is broadly applicable to a wide range of pseudo-rest frame method-related searches involving undetected particles. Remarkably, it requires only a single simulation to account for the smearing effects resulting from the pseudo-rest frame approximation. The uniqueness of this function lies in its dependency on the mass of the undetected particle, enabling continuous exploration of the mass parameter space. We validate the performance of our parametric function using simulated datasets and find that it exhibits comparable performance to traditional simulation-based methods. Notably, our approach offers the distinct advantage of accommodating any mass value for the undetected particle without the need for multiple simulations.

   hep-phhep-ex0 citations
3. 03*

   Magnetic field dependence of the neutral pion longitudinal screening mass in the linear sigma model with quarks

   Alejandro Ayala🇲🇽 · Ricardo L. S. Farias🇧🇷 · L. A. Hernández🇲🇽 · Ana Julia Mizher🇧🇷 · Javier Rendón🇲🇽 · Cristian Villavicencio🇨🇱 · R. Zamora🇨🇱

   We use the linear sigma model with quarks to study the magnetic-field-induced modifications on the longitudinal screening mass for the neutral pion at one-loop level. The effects of the magnetic field are introduced into the self-energy, which contains the contributions from all the model particles. We find that, to obtain a reasonable description for the behavior with the field strength, we need to account for the magnetic field dependence of the particle masses. We also find that the couplings need to decrease fast enough with the field strength to then reach constant and smaller values as compared to their vacuum ones. The results illustrate the need to treat the magnetic corrections to the particle masses and couplings in a self-consistent manner, accounting for the backreaction of the field effects for the magnetic field dependence of the rest of the particle species and couplings in the model.

   hep-phhep-latnucl-thPRD(2024)·15 citations
4. 04*

   Analysis of the data for $\gamma p\to f_1(1285)p$ photoproduction

   Ai-Chao Wang🇨🇳 · Neng-Chang Wei🇨🇳 · Fei Huang🇨🇳

   The photoproduction of $f_1(1285)$ meson off proton is investigated within an effective Lagrangian approach. The $t$-channel $\rho$- and $\omega$-exchange diagrams, $u$-channel nucleon-exchange diagram, generalized contact term, and $s$-channel pole diagrams of nucleon and a minimal number of nucleon resonances are taken into account in constructing the reaction amplitudes to describe the experimental data. Three different models, i.e., the Feynman model, the Regge model, and the interpolated Regge model, are employed where the $t$-channel reaction amplitudes are constructed in Feynman type, Regge type, and interpolated Regge type, respectively. The results show that in neither Feynman model with two nucleon resonances introduced nor interpolated Regge model with one nucleon resonances included, can the available data for $\gamma p\to f_1(1285)p$ be satisfactorily reproduced. Nevertheless, in the Regge model, when any one of the $N(1990){7/2}^{+}$, $N(2000){5/2}^{+}$, $N(2040){3/2}^{+}$, $N(2060){5/2}^{-}$, $N(2100){1/2}^{+}$, $N(2120){3/2}^{-}$, $N(2190){7/2}^{-}$, $N(2300){1/2}^{+}$, and $N(2570){5/2}^{-}$ resonances is considered, the data can be well described. The resulted resonance parameters are consistent with those advocated in Particle Data Group (PDG) review. Further analysis shows that in high-energy region, the peaks of $\gamma p\to f_1(1285)p$ differential cross sections at forward angles are dominated by the contributions from $t$-channel $\rho$- and $\omega$-exchange diagrams, while in low-energy region, the $s$-channel pole diagrams of resonances also provide significant contributions to the $\gamma p\to f_1(1285)p$ cross sections.

   hep-phnucl-thCPC(2024)·1 citation
5. 05*

   Mass spectra of $0^{--}$ and $0^{+-}$ hidden-heavy baryoniums

   Bing-Dong Wan🇨🇳

   In this work, the spectra of the prospective exotic hidden-charm and hidden-bottom baryonium, viz. the baryon-antibaryon states, with $J^{PC}=0^{--}$ and $0^{+-}$ are investigated in the framework of QCD sum rules. The non-perturbative contributions up to dimension 12 are taken into account. Numerical results indicate that there might exist 3 possible $0^{--}$ hidden-charm baryonium states with masses $(5.22\pm 0.26)$, $(5.52\pm 0.25)$, and $(5.46\pm 0.24)$ GeV, and 5 possible $0^{+-}$ hidden-charm baryonium states with masses $(4.76\pm 0.28)$, $(5.24\pm 0.28)$, $(5.16\pm 0.27)$, $(5.52\pm 0.27)$, and $(5.69\pm 0.27)$ GeV, respectively. The corresponding hidden-bottom partners are found lying in the range of $11.68-12.28$ GeV and $11.38-12.33$ GeV, respectively. The possible baryonium decay modes are analyzed, which are hopefully measurable in LHC experiments.

   hep-phEPJC(2024)·18 citations
6. 06*

   Bubble dynamics in the Polyakov quark-meson model

   Junrong Wang🇨🇳 · Jinshuang Jin🇨🇳 · Hong Mao🇨🇳

   In the framework of the Polyakov quark-meson model with two flavors, the bubble dynamics of a first-order phase transition in the region of high density and low temperature are investigated by using the homogeneous thermal nucleation theory. In mean-field approximation, after obtaining the effective potential with inclusion of the fermionic vacuum term, we build a geometric method to search two existing minima, which can be actually connected by a bounce interpolated between a local minimum to an adjacent global one. For both weak and strong first-order hadron quark phase transitions, as fixing the chemical potentials at $\mu =306\mathrm{MeV}$ and $\mu =310\mathrm{MeV}$, the bubble profiles, the surface tension, the typical radius of the bounce and the saddle point action as a function of temperature are numerically calculated in the presence of a nucleation bubble. It is found that the surface tension remains a very small value even when the density is high. It is also noticed that the deconfinement phase transition does not change chiral phase transition dramatically for light quarks and phase boundaries for hadron and quark matter should be resized properly according to the saddle-point action evaluated on the bounce solution.

   hep-phSymmetry(2024)·4 citations
7. 07*

   $b\to s\gamma$, electron EDM and electroweak baryogenesis: a study in general 2HDM

   George Wei-Shu Hou🇹🇼

   We study inclusive $b\to s\gamma$ decay in the context of electron EDM and baryogenesis. The general 2HDM (i.e. without $Z_2$) that possesses an extra set of Yukawa matrices can drive electroweak baryogensis via ${\lambda }_t\mathrm{Im}{\rho }_{tt}$, where ${\rho }_{tt}$ is the extra diagonal top Yukawa coupling, with the $e$EDM constraint evaded by an exquisite flavor cancellation mechanism. We touch upon the current status of direct search for exotic $H$, $A$ and $H^{+}$ scalars at the LHC, while for the plethora of flavor observables in $g$2HDM, we focus on $b\to s\gamma$, pointing out $chiral$ enhancement of a ${\rho }_{tt}{\rho }_{bb}$ effect in $g$2HDM, which can bring in a CPV phase. We first explore the inclusive $\mathcal{B}(b\to s\gamma )$ rate, then showcase the progress that Belle II can make in the future, illustrating a potential 3$\sigma$ effect for the inclusive $B^{+}\to X_s^{+}\gamma$ vs $B^0\to X_s^0\gamma$ CPV rate difference, $\Delta A_{\mathrm{CP}}$. Especially if $e$EDM emerges swiftly, perhaps one should pursue further upgrade beyond Belle II.

   hep-phPoS(2024)·0 citations
8. 08*

   Space-like Electromagnetic Form Factors of Lambda- and Sigma-Baryons from Quark-Diquark Faddeev Equations

   Langtian Liu🇩🇪 · Christian S. Fischer🇩🇪

   An important goal of ongoing and future experiments is to explore spectra and transition form factors of baryons with non-zero strangeness. Of particular interest is the transition form factor${\gamma }^{(\ast )}{\Sigma }^0\to \Lambda$ in the time-like momentum region that can be extracted from Dalitz decays. On the road towards a theoretical description of these form factors we extend a covariant dynamical quark-diquark model for the baryon Faddeev equation to the strange-quark sector. Based on an excellent description of the mass spectrum of selected baryon octet and decuplet states and reasonable results for the nucleon form factors we determine the elastic electromagnetic form factors of $\Lambda$ and ${\Sigma }^{+},{\Sigma }^0,{\Sigma }^{-}$ hyperons in the space-like region as well as the ones for the octet transition ${\gamma }^{(\ast )}{\Sigma }^0\to \Lambda$. We discuss qualitative and quantitative features of the diquark-quark picture and compare systematically with previous results from a three-body Faddeev approach and lattice data where available.

   hep-phnucl-thEPJA(2024)·8 citations
9. 09*

   Impact of primordial black holes on heavy neutral leptons searches in the framework of resonant leptogenesis

   Roberta Calabrese🇮🇹 · Marco Chianese🇮🇹 · Jacob Gunn🇮🇹 · Gennaro Miele🇮🇹 · Stefano Morisi🇮🇹 · Ninetta Saviano🇮🇹

   We investigate the effects on sub-TeV resonant leptogenesis of Primordial Black Holes with masses from $10^6$ to $\sim 10^9$ g. The latter might dominate the energy content of the Universe altering its evolution and, eventually, diluting the final baryon asymmetry. We find that, depending on the mass and abundance of Primordial Black Holes, the parameter space of sub-TeV resonant leptogenesis shrinks towards higher Right-Handed Neutrino masses and smaller active-sterile mixing. Remarkably, this translates into important implications for the experimental searches of heavy neutral leptons. Conversely, we demonstrate that a possible future detection of sub-TeV heavy neutral leptons would disfavour regions of the parameter space of Primordial Black Holes currently allowed.

   hep-phPRD(2024)·21 citations
10. 10*

    Analytical formula for the cross section of hadron production from $e^{+}{e}^{-}$ collisions around the narrow charmouinum resonances

    Yanan Wang🇨🇳 · Yadi Wang🇨🇳 · Ping Wang🇨🇳

    The paper reports an analytical formula for the production cross section of $e^{+}{e}^{-}$ annihilation to hadrons in the vicinity of a narrow resonance, particularly in the $\tau$-charm region, while considering initial state radiation. Despite some approximations in its derivation, the comparison between the analytical formula and direct integration of ISR shows good accuracy, indicating that the analytical formula meets current experimental requirements. Furthermore, the paper presents a comparison of the cross section between the analytical formula and calculations using the {\sc ConExc} Monte Carlo generator. The efficiency of the analytical formula in significantly reducing computing time makes it a favorable choice for the regression procedure to extract the parameters of narrow charmonium resonances in experiments.

    hep-phhep-exCPC(2024)·5 citations
11. 11*

    Thermal Pair Production from Photon-Photon Collision: Breit-Wheeler Process at Finite Temperature

    D. S. Cabral🇧🇷 · A. F. Santos🇧🇷 · R. Bufalo🇧🇷

    In this paper we examine the pair production through the Breit-Wheeler process $\gamma \gamma \to e^{+}{e}^{-}$ in a thermal background. We compute the thermal contribution to the Breit-Wheeler differential cross section within the thermofield dynamics formalism. We evaluate in details the cross section for this process, which possess a surprisingly simple expression valid for any temperature $\beta$, from which we discuss some physically relevant aspects. We also consider the high temperature regime of the cross section in order to have a better understanding about its thermal behavior.

    hep-phhep-thEPJC(2023)·3 citations
12. 12*

    $Z$ polarization at an $e^{+}{e}^{-}$ collider and properties of decay-lepton angular asymmetries

    Kumar Rao🇮🇳 · Saurabh D. Rindani🇮🇳 · Priyanka Sarmah🇹🇼 · Balbeer Singh🇺🇸

    $Z$ production at an $e^{+}{e}^{-}$ collider, associated with production of other particles, can be an accurate source of information of details of electroweak interactions, including possible interactions beyond the standard model. We discuss from a general physical point of view the properties of the density matrix as well as lepton angular asymmetries. While most considerations will be applicable to processes of $Z$ production associated with any other particle or particles, for some discussions, we specialize to a $HZ$ final state. While many of the results can be found in earlier literature, especially for the process $e^{+}{e}^{-}\to HZ$, we give details of the reasoning, which are not always found. We discuss the properties of the spin density matrix under C, P and T transformations, and combinations thereof, as also the predictions of these for the corresponding leptonic asymmetries. The specific transformations P, CP, T and CPT are of special importance and we discuss the consequences of these symmetries or their absence for the leptonic asymmetries. A specific issue which has been given attention to is the role of beam polarization, and how one can infer on general grounds which asymmetries get enhanced by the use of beam polarization. Similarly, we also discuss which asymmetries would be sensitive to the measurement of tau polarization in $Z$ decay in to ${\tau }^{+}{\tau }^{-}$.

    hep-phProc.Indian Natl.Sci.Acad.(2024)·5 citations
13. 13*

    Higher twist corrections to $B$-meson decays into a proton and dark antibaryon from QCD light-cone sum rules

    Anastasia Boushmelev🇩🇪 · Marcel Wald🇩🇪

    The $B$-Mesogenesis framework anticipates decays of $B$ mesons into a dark antibaryon $\Psi$ and various Standard Model baryons. Here, we focus on the exclusive decay process $B\to p\Psi$ observed as a proton and missing energy in the final state and determine the decay width by employing the QCD light-cone sum rule framework. We include all contributions up to twist six to the nucleon distribution amplitudes in order to parameterize the non-perturbative effects in the operator product expansion. We obtain the decay width and branching fraction with respect to the mass $m_{\Psi }$ of the dark antibaryon $\Psi$, normalized to the model-dependent effective four-fermion coupling.

    hep-phPRD(2024)·15 citations
14. 14*

    Explicit no-${\pi }^2$ renormalization schemes in QCD at five loops

    J.A. Gracey🇬🇧

    We examine a variety of renormalization schemes in QCD based on its $3$-point vertices where the $\beta$-functions, gluon, ghost, quark and quark mass anomalous dimensions in each scheme do not depend on ${\zeta }_4$ or ${\zeta }_6$ in an arbitrary linear covariant gauge at five loops. We comment on the $C$-scheme.

    hep-phPRD(2024)·6 citations
15. 15*

    Hadronic Mono-$W^{\prime }$ Probes of Dark Matter at Colliders

    Ryan Holder🇺🇸 · John Reddick🇺🇸 · Matteo Cremonesi🇺🇸 · Doug Berry🇺🇸 · Kun Cheng🇨🇳 · Matthew Low🇺🇸 · Tim M.P. Tait🇺🇸 · Daniel Whiteson🇺🇸

    Particle collisions at the energy frontier can probe the nature of invisible dark matter via production in association with recoiling visible objects. We propose a new potential production mode, in which dark matter is produced by the decay of a heavy dark Higgs boson radiated from a heavy $W^{\prime }$ boson. In such a model, motivated by left-right symmetric theories, dark matter would not be pair produced in association with other recoiling objects due to its lack of direct coupling to quarks or gluons. We study the hadronic decay mode via $W^{\prime }\to tb$ and estimate the LHC exclusion sensitivity at 95\% confidence level to be $10^2-10^5$ fb for $W^{\prime }$ boson masses between 250 and 1750 GeV.

    hep-phhep-exJHEP(2024)·0 citations
16. 16*

    Functional Matching and Renormalization Group Equations at Two-Loop Order

    Javier Fuentes-Martín🇪🇸 · Ajdin Palavrić🇨🇭 · Anders Eller Thomsen🇨🇭

    We present a systematic method for determining the two-loop effective Lagrangian resulting from integrating out a set of heavy particles in an ultraviolet scalar theory. We prove that the matching coefficients are entirely determined from the (double-)hard region of the loop integrals and present a master formula for matching, applicable to both diagrammatic and functional approaches. We further employ functional methods to determine compact expressions for the effective Lagrangian that do not rely on any previous knowledge of its structure or symmetries. The same methods are also applicable to the computation of renormalization group equations. We demonstrate the application of the functional approach by computing the two-loop matching coefficients and renormalization group equations in a scalar toy model.

    hep-phPLB(2024)·36 citations
17. 17*

    Third-Family Lepton-Quark Fusion

    Arman Korajac🇸🇮 · Peter Krack🇳🇱 · Nudzeim Selimovic🇮🇹

    We analyze the signatures of new physics scenarios featuring third-family quark-lepton unification at the TeV scale in lepton-quark fusion at hadron colliders. Working with complete UV dynamics based on the $SU(4)$ gauge symmetry in the third-family fermions, we simulate the resonant production of a vector leptoquark at the next-to-leading order, including its decay and matching to the parton showers. The precise theoretical control over this production channel allows us to set robust bounds on the vector leptoquark parameter space which are complementary to the other production channels at colliders. We emphasize the importance of the resonant channel in future searches and discuss the impact of variations in the model space depending on the flavor structure of the vector leptoquark couplings.

    hep-phhep-exEPJC(2024)·6 citations
18. 18*

    Primordial Black Holes from Conformal Higgs

    Yann Gouttenoire🇮🇱

    Scale-invariant extensions of the electroweak theory are not only attractive because they can dynamically generate the weak scale, but also due to their role in facilitating supercooled first-order phase transitions. We study the minimal scale-invariant $U(1{)}_{\mathrm{D}}$ extension of the standard model and show that Primordial Black Holes (PBHs) can be abundantly produced. The mass of these PBHs is bounded from above by that of the moon due to QCD catalysis limiting the amount of supercooling. Lunar-mass PBHs, which are produced for dark Higgs vev $v_{\varphi }\simeq 20\mathrm{TeV}$, correspond to the best likelihood to explain the HSC lensing anomaly. For $v_{\varphi }\gtrsim 400\mathrm{TeV}$, the model can explain hundred per cent of dark matter. At even larger hierarchy of scales, it can contribute to the $511\mathrm{keV}$ line. While the gravitational wave (GW) signal produced by the HSC anomaly interpretation is large and detectable by LISA above astrophysical foreground, the dark matter interpretation in terms of PBHs can not be entirely probed by future GW detection. This is due to the dilution of the signal by the entropy injected during the decay of the long-lived $U(1{)}_{\mathrm{D}}$ scalar. This extended lifetime is a natural consequence of the large hierarchy of scales.

    hep-phastro-ph.COgr-qchep-thPLB(2024)·58 citations
19. 19*

    Training 3D ResNets to Extract BSM Physics Parameters from Simulated Data

    S. Dubey🇺🇸 · T.E. Browder🇺🇸 · S.Kohani🇺🇸 · R. Mandal🇮🇳 · A. Sibidanov🇺🇸 · R. Sinha🇺🇸

    We report on a novel application of computer vision techniques to extract beyond the Standard Model parameters directly from high energy physics flavor data. We propose a novel data representation that transforms the angular and kinematic distributions into ``quasi-images", which are used to train a convolutional neural network to perform regression tasks, similar to fitting. As a proof-of-concept, we train a 34-layer Residual Neural Network to regress on these images and determine information about the Wilson Coefficient $C_9$ in Monte Carlo simulations of $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decays. The method described here can be generalized and may find applicability across a variety of experiments.

    ↳ hep-excs.LGhep-ph1 citation
20. 20*

    Improvements in charged lepton and photon propagation for the software PROPOSAL

    Jean-Marco Alameddine🇩🇪 · Johannes Albrecht🇩🇪 · Hans Dembinski🇩🇪 · Pascal Gutjahr🇩🇪 · Karl-Heinz Kampert🇩🇪 · Wolfgang Rhode🇩🇪 · Maximilian Sackel🇩🇪 · Alexander Sandrock🇩🇪 · Jan Soedingrekso🇩🇪

    Accurate particle simulations are essential for the next generation of experiments in astroparticle physics. The Monte Carlo simulation library PROPOSAL is a flexible tool to efficiently propagate high-energy leptons and photons through large volumes of media, for example in the context of underground observatories. It is written as a C++ library, including a Python interface. In this paper, the most recent updates of PROPOSAL are described, including the addition of electron, positron, and photon propagation, for which new interaction types have been implemented. This allows the usage of PROPOSAL to simulate electromagnetic particle cascades, for example in the context of air shower simulations. The precision of the propagation has been improved by including rare interaction processes, new photonuclear parametrizations, deflections in stochastic interactions, and the possibility of propagating in inhomogeneous density distributions. Additional technical improvements regarding the interpolation routine and the propagation algorithm are described.

    ↳ astro-ph.IMhep-exhep-phComput.Phys.Commun.(2024)·7 citations
21. 21*

    Experimental determination of axion signal power of dish antennas and dielectric haloscopes using the reciprocity approach

    J. Egge🇩🇪 · M. Ekmedžić🇩🇪 · A. Gardikiotis🇩🇪 · E. Garutti🇩🇪 · S. Heyminck🇩🇪 · C. Kasemann🇩🇪 · S. Knirck🇺🇸 · M. Kramer🇩🇪 · C. Krieger🇩🇪 · D. Leppla-Weber🇩🇪 · S. Martens🇩🇪 · E. Öz🇩🇪 and 4 other authors

    The reciprocity approach is a powerful method to determine the expected signal power of axion haloscopes in a model-independent way. Especially for open and broadband setups like the MADMAX dielectric haloscope the sensitivity to the axion field is difficult to calibrate since they do not allow discrete eigenmode analysis and are optically too large to fully simulate. The central idea of the reciprocity approach is to measure a reflection-induced test field in the setup instead of trying to simulate the axion-induced field. In this article, the reciprocity approach is used to determine the expected signal power of a dish antenna and a minimal dielectric haloscope directly from measurements. The results match expectations from simulation but also include important systematic effects that are too difficult to simulate. In particular, the effect of antenna standing waves and higher order mode perturbations can be quantified for the first time in a dielectric haloscope.

    ↳ hep-exhep-phphysics.ins-detJCAP(2024)·14 citations
22. 22*

    Curvature of the energy per particle in neutron stars

    Michał Marczenko🇵🇱 · Krzysztof Redlich🇵🇱 · Chihiro Sasaki🇵🇱

    Neutron stars (NSs) serve as laboratories for probing strongly interacting matter at the most extreme densities. Their inner cores are expected to be dense enough to host deconfined quark matter. Utilizing state-of-the-art theoretical and multi-messenger constraints, we statistically determine the bulk properties of dense NS matter. We show that the speed of sound can be expressed in terms of the slope and curvature of the energy per particle. We demonstrate that the restoration of conformal symmetry requires changing the sign of the curvature of the bulk energy per particle as a function of energy density. Furthermore, we find that such a sign change is closely related to the peak in the speed of sound. We argue that the curvature of the energy per particle may serve as an approximate order parameter that signifies the onset of strongly coupled conformal matter in the NS core.

    ↳ nucl-thastro-ph.HEhep-phPRD(2024)·21 citations
23. 23*

    Lee-Yang and Langer edge singularities from analytic continuation of scaling functions

    Frithjof Karsch🇩🇪 · Christian Schmidt🇩🇪 · Simran Singh🇩🇪

    We discuss the analytic continuation of scaling function in the 3-dimensional Z(2),O(2) andO(4) universality classes using the Schofield representation of the magnetic equation of state. We show that a determination of the location of Lee-Yang edge singularities and, in the case of Z(2), also the Langer edge singularity yields stable results. Results for the former are in good agreement with Functional Renormalization Group calculations. We also present results for the location of the Langer edge singularity in the 3-d,Z(2) universality class. We find that in terms of the complex scaling variable z the distance of the Langer edge singularity to the critical point agrees within errors with that of the Lee-Yang edge singularity. Furthermore the magnitude of the discontinuity along the Langer branch cut is an order of magnitude smaller than that along the Lee-Yang branch cut.

    ↳ hep-latcond-mat.stat-mechhep-phPRD(2024)·15 citations
24. 24*

    Horizon brightened accelerated radiation in the background of braneworld black holes

    Ashmita Das🇮🇳 · Soham Sen🇮🇳 · Sunandan Gangopadhyay🇮🇳

    The concept of horizon brightened acceleration radiation (HBAR) has brought to us a distinct mechanism of particle production in curved spacetime. In this manuscript we examine the HBAR phenomena for a braneworld black hole (BBH) which emerges as an effective theory in our $(3+1)$ dimensional universe due to the higher dimensional gravitational effects. Despite being somewhat similar to the Reissner-Nordstr$\ddot{\mathrm{o}}$m solution in general relativity, the BBH is unique with respect to its charge term which is rather the tidal charge. In this background, we study the transition probability of the atom due to the atom-field interaction and the associated HBAR entropy. Both the quantities acquire modifications over the standard Schwarzschild results and turn out to be the function of the tidal charge. This modifications appear solely due to the bulk gravitational effects as induced on the 3-brane. Studying the Wien's displacement, we observe an important feature that the wavelengths of HBAR corresponding to the Schwarzschild and the BBH, deviate from each other depending on their masses. This deviation is found to be more pronounced for the mass values slightly greater or comparable to the Planck mass.

    ↳ gr-qchep-phhep-thquant-phPRD(2024)·17 citations
25. 25*

    Exclusive $J/\psi$, $\psi (2s)$, and $e^{+}{e}^{-}$ pair production in Au$+$Au ultra-peripheral collisions at RHIC

    STAR Collaboration

    Measurements of exclusive $J/\psi$, $\psi (2s)$, and electron-positron ($e^{+}{e}^{-}$) pair photoproduction in Au$+$Au ultra-peripheral collisions are reported by the STAR experiment at $\sqrt{s_{{}_{\mathrm{NN}}}}=200\mathrm{GeV}$. We report several first measurements at the Relativistic Heavy-Ion Collider, which are i) $J/\psi$ photoproduction with large momentum transfer up to $2.2(GeV/c{)}^2$, ii) coherent $J/\psi$ photoproduction associated with neutron emissions from nuclear breakup, iii) the rapidity dependence of incoherent $J/\psi$ photoproduction, iv) the $\psi (2s)$ photoproduction cross section at mid-rapidity, and v) $e^{+}{e}^{-}$ pair photoproduction up to high invariant mass of 6 $GeV/{\mathrm{c}}^2$. For measurement ii), the coherent $J/\psi$ total cross section of ${\gamma }^{\ast }+\mathrm{Au}\to J/\psi +\mathrm{Au}$ as a function of the center-of-mass energy $W_{\gamma \ast \mathrm{N}}$ has been obtained without photon energy ambiguities. The data are quantitatively compared with the Monte Carlo models STARlight, Sartre, BeAGLE, and theoretical calculations of gluon saturation with color glass condensate, nuclear shadowing with leading twist approximation, Quantum Electrodynamics, and the Next-to-Leading Order perturbative QCD. At the photon-nucleon center-of-mass energy of 25.0 GeV, the coherent and incoherent $J/\psi$ cross sections of Au nuclei are found to be $71\pm 10\%$ and $36\pm 7\%$, respectively, of that of free protons. These data provide an important experimental constraint for nuclear parton distribution functions and a unique opportunity to advance the understanding of the nuclear modification effect at the top RHIC energy.

    ↳ nucl-exhep-exhep-phnucl-thPRC(2024)·40 citations
26. 26*

    Observation of strong nuclear suppression in exclusive $J/\psi$ photoproduction in Au$+$Au ultra-peripheral collisions at RHIC

    STAR Collaboration

    We report a measurement of exclusive $J/\psi$ photoproduction in Au$+$Au ultra-peripheral collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}=200$ GeV using the STAR detector. For the first time, i) the rapidity correlation between $J/\psi$ photoproduction and neutron emission from nuclear breakups has been experimentally measured; ii) nuclear suppression factors are measured for both the coherent and incoherent $J/\psi$ production. At photon-nucleon center-of-mass energy of 25.0 GeV, the coherent and incoherent $J/\psi$ cross sections of Au nuclei are found to be $71\pm 10\%$ and $36\pm 7\%$, respectively, of that of free protons. The stronger suppression observed in the incoherent production provides a new experimental handle to study the initial-state parton density in heavy nuclei. Data are compared with theoretical models quantitatively.

    ↳ nucl-exhep-exhep-phnucl-thPRL(2024)·39 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.