Mon·Nov 25, 2024Monday·November 25, 2024

1. 01*

   Constraining Jet Quenching in Heavy-Ion Collisions with Bayesian Inference

   Alexandre Falcão🇳🇴 · Konrad Tywoniuk🇳🇴

   Jet suppression and modification is a hallmark feature of heavy-ion collisions. This can be attributed to an accumulated set of effects, including radiative and elastic energy loss and reabsorption of thermalized energy within the jet cone, which are encoded in a quenching weight, determining the probability distribution for a shift of the $p_T$ (energy loss). We perform a data-driven analysis, based on Bayesian inference, to extract information about the energy-loss distribution experienced by propagating jets using generic and flexible parametrizations. We first establish the consistency between different data-sets and, thereby, provide evidence for the universality of the quark/gluon quenching weights for different observables. Furthermore, we extract that the color dependence of energy loss is slightly bigger than what expected from Casimir scaling, pointing to the importance of multi-parton quenching within high-$p_T$ jets at the LHC.

   hep-phhep-exnucl-thJHEP(2026)·6 citations
2. 02*

   Gluon Saturation Effects in Exclusive Heavy Vector Meson Photoproduction

   Jani Penttala🇺🇸 · Christophe Royon🇺🇸

   We study exclusive $J/\psi$ and ${\rm Y}$ photoproduction for proton and Pb targets in the high-energy limit, with the energy dependence computed using the linear Balitsky-Fadin-Kuraev-Lipatov and the nonlinear Balitsky-Kovchegov evolution equations. The difference between these two evolution equations can be directly attributed to gluon saturation physics. We find that for proton targets there is no difference between the two approaches at the energies of the currently available data, while for Pb targets in $J/\psi$ production the data shows a clear preference for the evolution with gluon saturation.

   hep-phnucl-thPLB(2025)·18 citations
3. 03*

   Relative Hadron Yields in HRG With Medium Modification

   Nasir Ahmad Rather🇮🇳 · Sameer Ahmad Mir🇮🇳 · Iqbal Mohi Ud Din🇮🇳 · Saeed Uddin🇮🇳

   In the framework of a constituent quark mass model, the modified baryon masses are incorporated into the hadron resonance gas (HRG) based analysis of the like mass particle ratios in ultra relativistic nucleus-nucleus collisions (URNNC) over a wide range of collision energy. In addition we have incorporated an essential feature of the hadronic interaction at short distance, i.e. the hard-core repulsion by using the standard excluded volume type approach. We have extracted the chemical freeze-out conditions. The resulting freeze-out line in our case is compared with those obtained earlier using different model approaches. The correlation between $k^{-}/k^{+}$ and $\bar{p}/p$ ratios is also studied.

   hep-phnucl-thInt.J.Mod.Phys.A(2025)·4 citations
4. 04*

   Machine Learning Insights into Quark-Antiquark Interactions: Probing Field Distributions and String Tension in QCD

   Wei Kou🇨🇳 · Xurong Chen🇨🇳

   Understanding the interactions between quark-antiquark pairs is essential for elucidating quark confinement within the framework of quantum chromodynamics (QCD). This study investigates the field distribution patterns that arise between these pairs by employing advanced machine learning techniques, namely multilayer perceptrons (MLP) and Kolmogorov-Arnold networks (KAN), to analyze data obtained from lattice QCD simulations. The models developed through this training are then applied to calculate the string tension and width associated with chromo flux tubes, and these results are rigorously compared to those derived from lattice QCD. Moreover, we introduce a preliminary analytical expression that characterizes the field distribution as a function of quark separation, utilizing the KAN methodology. Our comprehensive quantitative analysis underscores the potential of integrating machine learning approaches into conventional QCD research.

   hep-phEPJC(2025)·8 citations
5. 05*

   Jet Substructure Analysis for Distinguishing Left- and Right-Handed Couplings of Heavy Neutrino in $W^{\prime }$ Decay at the HL-LHC

   Songshaptak De🇮🇳 · Atri Dey🇮🇪 · Tousik Samui🇮🇳

   The search for heavy $W^{\prime }$ bosons in their decay modes to a lepton and a heavy neutrino offers a promising avenue for probing new physics beyond the Standard Model. This work focuses on such a signature with an energetic lepton plus a fat jet, originating from the heavy neutrino and containing a lepton. We have employed the jet substructure techniques to isolate the embedded lepton as a subjet of the fat jet. The Lepton Subjet Fraction ($LSF$) and Lepton Mass Drop ($LMD$) variables constructed from the lepton subjet help in separating the signal region from the background. We further study the polarization properties of the $W^{\prime }$ coupling to the lepton and heavy neutrino through the decay products of the neutrino. Instead of relying on a specific model, we employ generic couplings and explore the discrimination power. Jet substructure-based angular variables $z_{\ell }$, $z_{\theta }$, and $z_k$ are combined to form BDT scores to obtain better separation power between left-chiral ($V-A$) and right-chiral ($V+A$) coupling configurations. By using $C{L}_s$ type profile likelihood estimator, we could achieve $\sim$ 2$\sigma$ $-$ 3$\sigma$ significance of excluding one coupling configuration in favour of the other.

   hep-phhep-exPRD(2025)·3 citations
6. 06*

   Effects of heavy quarks in the dipole cross section with the KLN model

   G.R.Boroun🇮🇷

   The dipole cross-section behavior for protons and nuclei is analyzed with and without considering the heavy quark masses in the Bjorken variable $x$ using the Kharzeev-Levin-Nardi (KLN) model of low $x$ gluon distributions. The Color Glass Condensate (CGC) effects in the color dipole model are influenced by the heavy quark masses in the Bjorken variable $x$ at $Q^2<Q_s^2$. These non-linear saturation effects will be observable in the LHeC and EIC at very small $x$ values.

   hep-phPRC(2025)·1 citation
7. 07*

   Hyperons in neutron star mergers

   Hristijan Kochankovski🇪🇸 · Angels Ramos🇪🇸 · Laura Tolos🇪🇸 · Sebastian Blacker🇩🇪 · Andreas Bauswein🇩🇪

   We discuss the effects induced by the potential presence of hyperons in hot and ultra-dense matter within the context of neutron star mergers. Specifically, we address their effect on the dominant post-merger frequency of the gravitational waves. By performing a simulation campaign with a large sample of hyperonic and nucleonic equations of state, we explicitly show that the unique thermal behavior of hyperonic equations of state results in a systematic shift of the dominant frequency with respect to the nucleonic reference level. The predicted shift has values of up to 150 Hz, and it could be detected with the newest generations of gravitational wave detectors. Thus this approach opens a new path for signaling the presence of hyperons in neutron star remnant matter.

   hep-phnucl-thPoS(2025)·2 citations
8. 08*

   The two-loop coefficient functions for double deeply virtual Compton scattering

   Vladimir M. Braun🇩🇪 · Hua-Yu Jiang🇨🇳 · Alexander N. Manashov🇩🇪 · Andreas von Manteuffel🇩🇪

   Making use of conformal symmetry of large-$n_f$ QCD in $d=4-2ϵ$ dimensions at the Wilson-Fischer fixed point, we calculate the two-loop coefficient functions in the operator product expansion of two electromagnetic currents in general kinematics with two different photon virtualities. This result is necessary for the description of the double deeply virtual Compton scattering to the next-to-next-to-leading order accuracy, but is also interesting for a range of other two-photon processes. We present analytic expression for the coefficient function in momentum fraction space in the $\overline{\text{MS}}$ scheme and study its numerical impact on the Compton form factors for a simple model of the generalized parton distributions. The calculated corrections turn out to be large and are significant for the kinematics of proposed experiments.

   hep-phJHEP(2025)·8 citations
9. 09*

   Gravitational Dark Matter Production in Supergravity $\alpha$-Attractor Inflation

   Chenhuan Wang🇩🇪 · Wenbin Zhao🇩🇪

   We consider gravitational particle production (GPP) of dark matter (DM) under a supergravity framework, where the $\alpha$-attractor inflation model is used. The particle spectrum is computed numerically and the DM number density is obtained. We show how the DM mass, gravitino mass and inflation model parameters modify the results, and find the reheating temperature which leads to sufficient DM production. In our setup, supergravity corrections suppress the efficiency of GPP, and make the isocurvature constraint much weaker compared with the normal case. With tensor-to-scalar ratio ranging from $10^{-3}-10^{-4}$ and DM mass from $10^{-2}{m}_{\varphi }-m_{\varphi }$, the required reheating temperature should be around $10^3\text{GeV}-10^7\text{GeV}$.

   hep-phastro-ph.COJCAP(2025)·2 citations
10. 10*

    Forward parton-nucleus scattering at next-to-eikonal accuracy in the CGC

    Tolga Altinoluk🇵🇱 · Guillaume Beuf🇵🇱 · Swaleha Mulani🇵🇱

    We derive the full next-to-eikonal (NEik) corrections to the gluon propagator from before to after traversing a highly boosted gluon background field, including corrections both beyond the shockwave limit and beyond the static limit in particular. After summarizing the results of the full NEik corrections to the before-to-after quark propagator computed in our earlier works, we also derive the before-to-inside, inside-to-inside and inside-to-after quark and gluon propagators, which are building blocks to calculate high-energy scattering processes at NEik order. Using these results and also including the NEik corrections that stem from interactions with the target via t-channel quark exchanges, we compute inclusive cross sections for quark and gluon production at forward rapidities in quark-nucleus and gluon-nucleus scatterings at NEik accuracy.

    hep-phPRD(2025)·20 citations
11. 11*

    Dark showers from sneaky dark matter

    Adrian Carmona🇪🇸 · Fatemeh Elahi🇩🇪 · Christiane Scherb🇺🇸 · Pedro Schwaller🇩🇪

    We present a minimal composite dark matter model, based on a $SU(N_d)$ dark sector with $n_f$ dark quarks and a heavy t-channel mediator. For $n_f\ge 4$, the dark flavor symmetry guarantees the stability of a subset of the dark pions, which serve as our dark matter candidates. Their relic abundance is determined by co-scattering or co-annihilation with the remaining dark pions, which are unstable and decay. Due to their degenerate masses, the annihilation cross section is suppressed at low temperatures, thereby avoiding stringent constraints from indirect detection and opening up the GeV mass window. The decaying dark pions are naturally long lived. We obtain limits on the model from semi-visible or emerging jet searches and estimate the reach of future probes.

    hep-phhep-exJHEP(2025)·11 citations
12. 12*

    Thermalization effects on the dynamics of growing vacuum bubbles

    Tomasz Krajewski🇵🇱 · Marek Lewicki🇵🇱 · Martin Vasar🇪🇪 · Ville Vaskonen🇪🇪 · Hardi Veermäe🇪🇪 · Mateusz Zych🇵🇱

    We study the evolution of growing vacuum bubbles. The bubble walls interact with the surrounding fluid and may, consequently, reach a terminal velocity. If the mean free path of the particles in the fluid is much shorter than the bubble wall thickness, the fluid is locally in thermal equilibrium and the wall's terminal velocity can be determined by entropy conservation. On the other hand, if local thermal equilibrium inside the wall cannot be maintained, the wall velocity can be estimated from the pressure impacted by ballistic particle dynamics at the wall. We find that the latter case leads to slightly slower bubble walls. Expectedly, we find the largest differences in the terminal velocity when the fluid is entirely ballistic. This observation indicates that the non-equilibrium effects inside walls are relevant. To study bubble evolution, we perform hydrodynamic lattice simulations in the case of local thermal equilibrium and $N$-body simulations in the ballistic case to investigate the dynamical effects during expansion. Both simulations show that even if a stationary solution exists in theory it may not be reached depending on the dynamics of the accelerating bubble walls.

    hep-phastro-ph.COhep-thJHEP(2025)·13 citations
13. 13*

    Pseudo-FIMP dark matter in presence of a SIMP

    Subhaditya Bhattacharya🇮🇳 · Dipankar Pradhan🇮🇳 · Jahaan Thakkar🇮🇳

    Pseudo-feebly Interacting Massive Particle (pFIMP) has been postulated in two component dark matter (DM) scenarios, where it has feeble interaction with the visible sector, but sizeable one with a thermal bath partner. In this work, we study the possibility and dynamics of pFIMP in presence of a Strongly Interacting Massive Particle (SIMP), which is well known to solve too-big-to-fail and core-vs-cusp problems. Our analysis is primarily model-independent via solving coupled Boltzmann equations, with negligible DM-DM conversion adhering to pure SIMP-FIMP limit, and then with larger DM-DM conversion rate pertaining to SIMP-pFIMP limit. We also illustrate the simplest model yielding pFIMP-SIMP set-up having two scalars stabilised under ${\mathbb{Z}}_2\otimes {\mathbb{Z}}_3$ symmetry, and explore the accessible parameter space after addressing relic density, unitarity, self interaction constraints etc. pFIMP detectability is limited in such circumstances, but possible via a thermal DM loop when the SIMP has a visible sector interaction via light mediator.

    hep-phhep-th2 citations
14. 14*

    Low-scale leptogenesis in the scotogenic model: spectator processes and benchmark points

    J. Racker🇦🇷

    We study leptogenesis from the decay of the lightest sterile neutrino in the scotogenic model with a scalar dark matter candidate. Our analysis focuses on the possible exponential suppression of washouts for sizable values of the inert Higgs mass and the crucial role of some spectator processes for this to happen. We show that leptogenesis can be successful for TeV-scale masses of the lightest sterile neutrino for both, thermal and zero, initial abundances of the neutrinos. Moreover, leptogenesis is viable for Yukawa couplings of the heavier sterile neutrinos large enough to yield observable charged lepton flavor violation processes in current and planned experiments.

    hep-phPRD(2025)·7 citations
15. 15*

    Odderon in the light of collider low-$t$ data

    E.G.S. Luna🇧🇷 · M.G. Ryskin🇷🇺 · V.A. Khoze🇬🇧

    Odderon is the $C$-odd amplitude that does not fall (or decrease very slowly) with energy. The expected amplitude is small and mainly real. Therefore, extracting it from the data on top of a much larger $C$-even contribution is challenging. The only chance is to consider the very low $|t|$ region of Coulomb nuclear interference or the diffractive dip region. Here we perform the analysis of elastic scattering $pp$ and $\bar{p}p$ data at low momentum transfer $|t|<0.1$ GeV${}^2$ within large collider energy interval $\sqrt{s}=50$ GeV $-$ 13 TeV in order to evaluate quantitatively the possible Odderon contribution. We use the two-channel eikonal model, which naturally accounts for the screening of the Odderon amplitude by the $C$-even (Pomeron) exchanges.

    hep-phhep-exActa Phys.Polon.Supp.(2025)·1 citation
16. 16*

    Unitarity effects in high-energy elastic scattering

    M. Maneyro🇺🇾 · E.G.S. Luna🇧🇷 · M. Peláez🇺🇾

    We investigate the high-energy behavior of the elastic scattering amplitude using the eikonal and $U$-matrix unitarization schemes. This work extends the analysis in [1] by exploring the sensitivity of the Pomeron and Odderon parameters to the inclusion of differential cross-section data over an extended range of $|t|$.

    hep-phhep-exUkr.J.Phys.(2024)·2 citations
17. 17*

    Simple Scaling Laws for Energy Correlators in Nuclear Matter

    Carlota Andres🇺🇸 · Fabio Dominguez🇪🇸 · Jack Holguin🇬🇧 · Cyrille Marquet🇫🇷 · Ian Moult🇺🇸

    Collider experiments involving nuclei provide a direct means of studying exotic states of nuclear matter. Recent measurements of energy correlators in both proton-nucleus (p-A) and nucleus-nucleus (A-A) collisions reveal sizable modifications, attributable to nuclear effects, compared to proton-proton (p-p) collisions. Energy correlators, and their associated light-ray operator product expansion (OPE), allow scaling behaviors of the measured spectrum to be directly mapped to properties of the underlying quantum field theory. Here, we demonstrate for the first time how this mapping occurs in nuclear collisions, and highlight how the light-ray OPE characterizes leading nuclear effects. We show that the leading modification to the energy correlator distribution is characterized by an enhancement of the expectation value of twist-4 light-ray operators, resulting in a scaling for the ratio of the two-point correlator in nuclear matter to that in vacuum of $\sim 1+a{\theta }^2$ up to quantum corrections. We verify that this leading twist-4 correction accurately describes recent A-A and p-A data, and is thus sufficient to capture the scaling behavior within the angular range measured for jet radii used in nuclear experiments. Our light-ray OPE based approach lays the groundwork for a rigorous characterization of nuclear modification to energy correlator observables.

    hep-phhep-thnucl-thPRL(2026)·26 citations
18. 18*

    Probing Lepton Number Violation at Same-Sign Lepton Colliders

    Carlos Henrique de Lima🇨🇦 · David McKeen🇨🇦 · John N. Ng🇨🇦 · Michael Shamma🇨🇦 · Douglas Tuckler🇨🇦

    Same-sign lepton colliders offer a promising environment to probe lepton number violation. We study processes that change lepton number by two units in the context of Majorana heavy neutral leptons and neutrinophilic scalars at $\mu$TRISTAN, a proposed same-sign muon collider. Our work shows that such colliders, with modest energy and luminosity requirements, can either reveal direct evidence of lepton number violation or significantly constrain unexplored regions of parameter space, especially in the case of a neutrinophilic scalar.

    hep-phhep-exPRD(2025)·21 citations
19. 19*

    Transverse and longitudinal spin alignment from color fields in heavy ion collisions

    Di-Lun Yang🇹🇼

    We analyze the spin alignment of vector mesons stemming from spin correlation of the quark and antiquark induced by background color fields in relativistic heavy ion collisions. The quark-coalescence equation relating the collision kernel of the vector-meson kinetic equation to spin alignment is expanded to the relativistic case. Focusing on the color-octet contribution, the spin alignment for $\varphi$ mesons from glasma fields with momentum dependence is investigated, where the scenarios for different spin quantization axes are considered. Moreover, we qualitatively analyze the spin alignment from isotropic color fields in the quark gluon plasma phase for comparison. In particular, we propose that the experimental measurement of spin alignment along the beam direction, dubbed as the longitudinal spin alignment, could be useful to identify the dominance of longitudinal spin correlation potentially led by the glasma effect in high-energy nuclear collisions.

    ↳ nucl-thhep-phPRD(2025)·12 citations
20. 20*

    Energy dependence of the deformed nuclear structure at small-$x$

    Heikki Mäntysaari🇫🇮 · Pragya Singh🇫🇮

    We quantify the effect of high-energy JIMWLK evolution on the deformed structure or heavy (Uranium) and intermediate (Ruthenium) nuclei. The soft gluon emissions in the high-energy evolution are found to drive the initially deformed nuclei towards a more spherical shape, although the evolution is slow ,especially for the longest distance-scale quadrupole deformation. We confirm a linear relationship between the squared eccentricity ${\epsilon }_n^2$ and the deformation parameter ${\beta }_n^2$ in central collisions across the energy range covered by the RHIC and LHC measurements. The applied JIMWLK evolution is found to leave visible signatures in the eccentricity evolution that can be observed if the same nuclei can be collided at RHIC and at the LHC, or in rapidity-dependent flow measurements. Our results demonstrate the importance of including the Bjorken-$x$ dependent nuclear geometry when comparing simulations of the Quark Gluon Plasma evolution with precise flow measurements at high collision energies.

    ↳ nucl-thhep-lathep-phEPJC(2025)·8 citations
21. 21*

    Ab initio study of the beryllium isotopes ${}^7$Be to ${}^{12}$Be

    Shihang Shen🇩🇪 · Serdar Elhatisari🇹🇷 · Dean Lee🇺🇸 · Ulf-G. Meißner🇩🇪 · Zhengxue Ren🇩🇪

    We present a systematic ab initio study of the low-lying states in beryllium isotopes from 7Be to 12Be using nuclear lattice effective field theory with the N3LO interaction. Our calculations achieve good agreement with experimental data for energies, radii, and electromagnetic properties. We introduce a novel, model-independent method to quantify nuclear shapes, uncovering a distinct pattern in the interplay between positive and negative parity states across the isotopic chain. By combining Monte Carlo sampling of the many-body density operator with a novel nucleon-grouping algorithm, the prominent two-center cluster structures, the emergence of one-neutron halo, complex nuclear molecular dynamics such as {\pi} orbital and {\sigma} orbital, emerge naturally.

    ↳ nucl-thastro-ph.COhep-phnucl-exPRL(2025)·52 citations
22. 22*

    Study of collective phenomena via the production of heavy quarks and quarkonia in hadronic collisions

    Victor Valencia Torres (on behalf of ALICE collaboration)🇫🇷

    Open heavy flavor and quarkonia have long been identified as ideal probes for understanding the quark-gluon plasma (QGP). Heavy quarks are produced in the early stage of the heavy-ion collisions. Therefore they experience the evolution of the medium produced, providing an important tool to investigate the properties of the QGP. In particular, the magnitude of the elliptic flow measured at the LHC is interpreted as a signature of the charm-quark thermalization in the QGP. This is reflected in the azimuthal anisotropies of the final particles. In addition, the observation of collective-like effects in high-multiplicity pp and p--Pb collisions provides new insights on the evolution of QGP-related observables going from large to small collision systems. A better understanding of heavy-quark energy loss, quarkonium dissociation, and production mechanism can therefore be obtained with those system-size dependent observables. We present recent results of the $\mathrm{J}/\psi$ and open heavy-flavor hadrons flow in pp, p--Pb, and Pb--Pb collisions carried out by the ALICE collaboration.

    ↳ hep-exhep-phnucl-exPoS(2025)·1 citation
23. 23*

    On the origin of mixed inhomogeneous phase in vortical gluon plasma

    V. V. Braguta🇷🇺 · M. N. Chernodub🇫🇷 · Ya. A. Gershtein🇷🇺 · A. A. Roenko🇷🇺

    Recently, lattice simulations of SU(3) Yang-Mills theory revealed that rotating hot gluon matter in thermal equilibrium possesses a novel inhomogeneous phase consisting of the deconfinement phase located in the center region, which is spatially separated from the confinement phase in the periphery. This inhomogeneous two-phase structure is also expected to be produced by vorticity in quark-gluon plasma formed in non-central relativistic heavy-ion collisions. We show that its vortical properties are determined by two types of couplings of the angular velocity to the gluon fields: a linear coupling to the mechanical angular momentum of gluons and a quadratic ``magnetovortical'' coupling to a chromomagnetic component. We demonstrate numerically that the distinctive inhomogeneous structure of the vortical (quark-)gluon plasma is determined by the latter, while the former plays only a subleading role. We argue that the anisotropy of the gluonic action in the curved co-rotating background can quantitatively explain the remarkable property that the spatial structure of this inhomogeneous phase disobeys the picture based on a straightforward implementation of the Tolman-Ehrenfest law. We also support our findings with Monte Carlo simulations of Yang-Mills plasma at the real-valued angular frequency, which take into account only the magnetic part of the action.

    ↳ hep-lathep-phhep-thJHEP(2025)·18 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.