Wed·Apr 22, 2026Wednesday·April 22, 2026

1. 01*

   Extracting Dark-Matter Mass from Angular Scanning

   Daeyeong Jeong🇰🇷 · Doojin Kim🇺🇸 · Jong-Chul Park🇰🇷

   We propose a novel method to determine the mass scale of ambient dark matter, applicable to (at least effectively) two-dimensional direct detection experiments that allow for directionality observables. Due to the motion of the solar system and Earth relative to the Galactic Center and the Sun, the dark-matter flux exhibits a directional preference. We first demonstrate that dark-matter event rates depend non-trivially on the angle between the detection plane and the overall dark-matter flow, with the curvature of this angular spectrum encoding mass information. As proof of principle, we take the recently proposed Graphene-Josephson-Junction-based superlight dark-matter detector as a concrete example and validate these theoretical expectations through numerical analyses.

   hep-ph0 citations
2. 02*

   Multiparticle production in electron-positron annihilation

   E. S. Kokoulina🇷🇺

   Multiparticle production in hadron and lepton interactions still attracts our attention. Simulation by using Monte Carlo event generators is performed before planning any experiment. But it often overestimates (or underestimates) experimental data. These generators are based on the theory of strong interactions, quantum chromodynamics (QCD), which is capable of performing calculations only in the perturbation theory. Soft processes that make up a significant contribution in high-energy interactions are forced to involve phenomenological models. Of all multiparticle production processes, electron-positron annihilation is the theoretically cleanest, proceeding via an intermediate virtual photon or $Z^0$-boson followed by quark-antiquark pair creation. QCD describes well the development of quark-gluon ($qg$) cascade as marcovian branching process, that is called first stage. The transformation of quarks and gluons produced in the $qg$-cascade into observable hadrons occurs in the second stage, hadronization, to which perturbation theory is no longer applicable. The choice of a scheme for it is based on experimental data. Convolution of $qg$-cascade and hadronization allowed us to describe the multiplicity in practice all processes of multiple production in both lepton and hadron high-energy collisions. This model is called the gluon dominance model. Several decades have passed since a series of $e^{+}{e}^{-}$ annihilation experiments were carried out. Now, the main interests of high energy physicists are focused on the study of multiparticle production in proton and heavy ion collisions. Their research revealed many new results in the theory of strong interactions, including the hadronization. That is why it appeared necessary to analyze multiplicity n $e^{+}{e}^{-}$-annihilation again.

   hep-ph0 citations
3. 03*

   A Scientific Human-Agent Reproduction Pipeline

   Joschka Birk🇩🇪 · Gregor Kasieczka🇩🇪 · Siddharth Mishra-Sharma🇨🇭 · Benjamin Nachman🇺🇸 · Dennis Noll🇺🇸 · Tanvi Wamorkar🇺🇸

   Reproducing scientific analyses is essential for preserving knowledge, building extensible codebases, and deepening researcher understanding - yet the effort often outweighs its academic recognition. We argue that the reproduction of scientific data analyses is fundamentally a translation task: converting human-readable knowledge (papers, documentation) into machine-readable analysis code. This makes it uniquely well-suited for AI agents. We present SHARP (Scientific Human-Agent Reproduction Pipeline), a structured framework for reproducing scientific analyses through human-agent collaboration. SHARP decomposes a reproduction task into discrete steps, which an AI agent executes autonomously using specialized subagents for code generation, testing, and quality assurance. At defined checkpoints, the researcher reviews progress, provides feedback, and steers the analysis - keeping the human firmly in control of scientific judgment while the agent handles implementation. We demonstrate SHARP by reproducing a jet classification task in particle physics from a published paper. We evaluate the reproduction along three axes: analysis performance against the original results, code quality and faithfulness, and the nature of the human-agent conversation. The latter is evaluated with a novel framework for characterizing human-agent interactions. Our work highlights a practical model for AI-assisted scientific reproduction where the researcher's role shifts from writing code to understanding, evaluating, and directing - elevating human understanding rather than replacing it.

   hep-phhep-ex6 citations
4. 04*

   Mass spectrum, magnetic moments and Regge trajectories of ${\Omega }_{ccb}$ and ${\Omega }_{cbb}$ baryons in the nonrelativistic quark--diquark model

   Öznur Çakır🇹🇷 · Halil Mutuk🇹🇷

   In this work, we investigate the mass spectra, magnetic moments, and Regge trajectories of the triply heavy baryons ${\Omega }_{ccb}$ and ${\Omega }_{cbb}$ within a nonrelativistic constituent quark model based on the quark--diquark approximation, which reduces the three-body problem to an effective two-body system. For each baryon, all three possible diquark clusterings are considered, providing a qualitative indication of the sensitivity of the results to the quark--diquark decomposition. The model parameters are fixed by a fit to the measured $B_c$ meson spectrum, thereby anchoring the baryon predictions to experimentally constrained inputs and establishing a consistent link between the heavy meson and baryon sectors. We obtain ground-state masses of approximately $8.0$~GeV for ${\Omega }_{ccb}$ and $11.0$~GeV for ${\Omega }_{cbb}$, with radial and orbital excitation patterns in good agreement with the results reported in the literature. The computed magnetic moments of the spin-$\frac{1}{2}$ and spin-$\frac{3}{2}$ states are consistent with the results of various approaches. A radial Regge analysis in the $(n_r,M^2)$ plane reveals approximately linear $P$-wave trajectories and mildly curved $S$-wave trajectories, with slope and intercept parameters that scale systematically with the heavy-quark content of the baryon. These results suggest that the nonrelativistic quark--diquark framework provides a reliable description of triply heavy baryons and serves as a useful reference for future experimental searches, particularly at LHCb.

   hep-phhep-exhep-latEPJC(2026)·4 citations
5. 05*

   Vortex structures in electron-positron pair production by two-colored fields

   Adiljan Sawut🇨🇳 · Ying-Jun Li🇨🇳 · Hong-Hao Fan🇨🇳 · Bai-Song Xie🇨🇳

   We investigate the spin resolved vortex properties of electron positron pairs created from vacuum in time delayed, two color electromagnetic fields. By treating the temporal delay G as a continuous tuning parameter, we reveal a dynamic transition from interference-dominated domain patterns at G=0 to the nucleation of quantized vortex lattices at G=0.5. These topological structures exhibit a staggered arrangement analogous to von Karman vortex streets in fluid dynamics. We demonstrate that the momentum-space morphology is strictly governed by spin orbit selection rules, i.e., parallel spin configurations enforce a dipole-like connectivity, while anti-parallel configurations resolve into distinct quadrupole structures. This difference originates from the conservation of total angular momentum Jz, where the spin projection determines the required orbital angular momentum Lz of the created pairs. At large delays (G greater than 1), macroscopic vortex coherence dissolves into a chaotic phase landscope due to multi-channel interference, yet the spin-dependent nodal geometries remain robust. Our findings suggest that these topological signatures provide a high-fidelity diagnostic for the quantum dynamics of vacuum excitations in strong field QED.

   hep-phcond-mat.quant-gasquant-ph0 citations
6. 06*

   Implications of the First JUNO Results for Dirac Neutrino Texture Zeros

   Priya🇮🇳 · Ranjeet Kumar🇰🇷 · Labh Singh🇮🇳 · Surender Verma🇮🇳

   Motivated by the first oscillation results from JUNO, we study the phenomenological viability of texture zeros in the Dirac neutrino mass matrix. The improved precision on the solar mixing angle ${\sin }^2{\theta }_{12}$ and the solar mass-squared difference $\Delta m_{21}^2$ provide a stringent probe for scrutinizing predictive texture zero frameworks. We perform a systematic scan of the allowed parameter space for two-zero textures, identifying sharp correlations among oscillation observables arising from the reduced parameter space. Our analysis reveals that current JUNO measurements impose stringent constraints on the viable texture structures. In particular, although textures $C$, $A_2$, and $A_1$ were previously viable, current JUNO data strongly disfavor $C$, leaving only textures $A_2$ and $A_1$ compatible with the data. These findings underscore the remarkable sensitivity of Dirac texture zero scenarios to the solar sector.

   hep-phhep-th3 citations
7. 07*

   CP-violating multi-field phase transitions and gravitational waves in a hidden NJL sector

   Chang-Xin Liu🇨🇳

   We investigate the dynamics of a cosmological first-order phase transition (FOPT) and the associated stochastic gravitational wave background (SGWB) in a hidden strongly coupled sector described by an extended Nambu--Jona-Lasinio (NJL) model with $N_f=3$ fermion flavors. The model incorporates a CP-violating six-fermion 't Hooft interaction, an explicit chiral symmetry breaking mass term, and chirally symmetric eight-fermion operators that stabilize the vacuum. We perform a multi-field analysis of the tunneling dynamics, going beyond conventional single-field approximations. The interplay between explicit symmetry breaking and CP violation induces a vacuum misalignment, resulting in a curved tunneling path and a spatially varying CP-violating background across the bubble wall. Through a comprehensive scan of the multi-dimensional parameter space, we find a parameter regime where the conventionally rapid transition rate of the NJL framework is drastically reduced to $\beta /H\sim \mathcal{O}(10^2)$. Consequently, the gravitational wave (GW) production is significantly enhanced, with the predicted SGWB peak amplitudes successfully reaching the detection sensitivity of the proposed $\mu$Ares observatory. Furthermore, our analysis reveals that the macroscopic thermodynamic properties governing the SGWB are predominantly determined by the radial profile of the effective potential, rendering the resulting GW signatures remarkably insensitive to the CP-violating topological vacuum angle. Finally, the explicit symmetry breaking mass introduces a crucial energy bias between competing vacua, triggering the prompt collapse of transient domain wall configurations and thereby ensuring the cosmological viability of the model.

   hep-ph0 citations
8. 08*

   Progress on the soft anomalous dimension in QCD

   Einan Gardi🇬🇧 · Zehao Zhu🇬🇧

   We review the state-of-the-art knowledge of IR singularities in multileg QCD amplitudes, identifying the key reasons for the remarkable simplicity of the soft anomalous dimension. We then present a novel strategy to compute this quantity using a lightcone expansion of correlators of semi-infinite Wilson lines by the Method of Regions. Recently, this strategy allowed us to determine the three-loop soft anomalous dimension for amplitudes consisting of a single massive coloured particle with any number of massless ones. It opens the way to computing this quantity for amplitudes involving two heavy particles at three loops and potentially going to higher loop orders.

   hep-phhep-thPoS(2025)·0 citations
9. 09*

   Probing the neutrino trident process using the Scattering and Neutrino Detector at HL-LHC and SHiP

   Reinaldo Francener🇧🇷 · Victor P. Goncalves🇧🇷

   Neutrino trident scattering is a rare process in the Standard Model characterized by two charged leptons in the final state. In this work, we investigate the possibility of probing the neutrino trident process using the Scattering and Neutrino Detector (SND) at the Large Hadron Collider during its high - luminosity run (HL - LHC). In addition, we present, for the first time, the predictions for the neutrino trident scattering at SHiP beam - dump experiment, where a similar detector is expected to be installed. We demonstrate that these two experiments probe the process in a complementary energy range. Assuming the upgraded detector configuration, we estimate the cross-sections associated with all possibles leptonic final states in coherent and incoherent processes. The corresponding number of neutrino trident scatterings in the SND at HL-LHC and SHiP are presented. Our results indicate that this process can be observed in these forthcoming experiments for some specific combinations of leptons in the final state.

   hep-phhep-ex0 citations
10. 10*

    $SO(10)$-inspired leptogenesis

    Pasquale Di Bari🇬🇧

    In the first part of the talk, I review general properties of $SO(10)$-inspired leptogenesis. This high-scale leptogenesis scenario is based on the simple assumption that the neutrino Dirac mass matrix is not too different from the up quark mass matrix. After showing how this necessarily implies a production of the asymmetry from the next-to-lightest right handed neutrino decays, so-called $N_2$-leptogenesis, I discuss how this results into important testable constraints on low energy neutrino parameters. In particular inverted ordering is not viable if strict $SO(10)$-inspired conditions are assumed. This is an important test in view of the expected results from the JUNO experiment. I also discuss how a subset of the $SO(10)$-inspired leptogenesis solutions realises strong thermal leptogenesis, where the final asymmetry is independent of the initial conditions. In this case a signal might be discovered by next generation $0\nu \beta \beta$ decay experiments. In the second part, I present some new results from \cite{DiBari:2025zlv}, where the impact of flavour coupling on $SO(10)$-inspired leptogenesis has been studied in detail.

    hep-ph0 citations
11. 11*

    Next-to-leading order QCD and relativistic corrections to $Z\to J/\psi +{\rm Y}(nS)$

    Guang-Yu Wang🇨🇳 · Xu-Chang Zheng🇨🇳 · Guang-Zhi Xu🇨🇳

    In this paper, we calculate the decay widths and branching fractions for the decays $Z\to J/\psi +{\rm Y}(nS)$ ($n=1,2,3$) at future super $Z$ factory and at the CEPC/FCC-ee, including both the relativistic and QCD corrections within the framework of nonrelativistic QCD. Both the relativistic and QCD corrections are found to be large and negative. Compared to the leading-order results, the decay widths are significantly reduced by the higher-order corrections due to significant numerical cancellations. Despite the resulting large theoretical uncertainties, sizable event rates from these rare decay channels could still be anticipated at future high-luminosity electron-positron colliders running around the Z-pole. Ultimately, our results provide an essential theoretical baseline, highlighting the necessity of incorporating even higher-order corrections and resummation techniques for future precision phenomenological studies.

    hep-phEPJC(2026)·1 citation
12. 12*

    Centrality Dependence of the Balance Functions for Identified Particles in Pb--Pb Collisions Using Pythia + Angantyr

    Rashi Gupta🇮🇳 · Ankhi Roy🇮🇳

    In this paper, we study the balance functions for pions, kaons, and protons in Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV using the PYTHIA 8.3 + Angantyr model. The balance function is evaluated through two-particle azimuthal angular correlations $(\Delta \varphi ,\Delta \eta )$ between particle and antiparticle. Correlations are constructed for $\pi \pi$, $KK$, and $pp$, and their dependence on collision centrality is investigated. The results indicate that the balance function for pions is narrower compared to kaons and protons. Notably, the pion balance function width decreases from peripheral to central collisions, while the widths for kaons and protons remain nearly unchanged. For the Monash 2013 tune used in this study, PYTHIA 8.3 + Angantyr describes peripheral collisions reasonably well but does not quantitatively reproduce central Pb--Pb data. This suggests that an improved description of central Pb--Pb collisions may require a dedicated heavy-ion tuning of the Angantyr framework. We further explore the influence of resonance decays and collective effects by incorporating multi-parton interactions and color reconnection into the analysis. Owing to resonance effects and Bose--Einstein correlations, a dip at $\Delta \eta =0$ and $\Delta \varphi =0$ is observed for pions and kaons.

    hep-phPRC(2026)·0 citations
13. 13*

    QCD-factorization amplitudes from flavour symmetries: beyond the $SU(3)$ symmetric case

    Wen-Sheng Fang🇨🇳 · Tobias Huber🇩🇪 · Xin-Qiang Li🇨🇳 · Eleftheria Malami🇩🇪 · Gilberto Tetlalmatzi-Xolocotzi🇩🇪

    Using experimental information on branching ratios as well as direct and mixing-induced CP asymmetries, we perform a data-driven analysis of charmless non-leptonic $B\to PP$ decays, where $P$ is any of the light pseudoscalar mesons. Implementing flavour-$SU(3)$ breaking at the level of transition form factors, decay constants and phase space factors, we find a good fit to the current experimental data. Our best-fit point materializes in QCD-factorization amplitudes whose central values resemble many features of the dynamical predictions obtained within the QCD factorization framework. Moreover, we do not find any strong indications that the size of annihilation amplitudes is numerically enhanced beyond the naïve ${\Lambda }_{\text{QCD}}/m_b$ scaling. Subsequently, we address a number of phenomenological applications, among which are various flavour puzzles that have been persisting in non-leptonic $B$ decays for quite some time.

    hep-phhep-ex5 citations
14. 14*

    Probing the Tau Anomalous Magnetic Moment at Colliders: From Ultra-Peripheral Collisions to the Precision Frontier

    Natascia Vignaroli🇮🇹

    The anomalous magnetic moment of the tau lepton, $a_{\tau }$, represents a fundamental test of the Standard Model (SM) and a high-sensitivity probe for New Physics in the third generation of leptons. Due to the tau's extremely short lifetime, traditional spin-precession measurements remain inaccessible, necessitating innovative experimental strategies at high-energy colliders. This review provides a comprehensive overview of the current experimental landscape, highlighting the recent paradigm shift from LEP-era constraints to the unprecedented precision reached at the LHC. We emphasize the importance of Ultra-Peripheral Heavy-Ion Collisions (UPCs), which act as a ``photon-photon collider'' of extreme intensity. By leveraging the $Z^4$ enhancement of the coherent photon flux in Lead-Lead ($PbPb$) interactions, these collisions provide a theoretically robust ``quasi-static'' environment. These results are critically compared with the latest measurements from proton-proton collisions, including the recent CMS observation of the $\gamma \gamma \to \tau \tau$ process and the ATLAS constraints from the high-mass Drell-Yan tail. We evaluate their complementarity and the challenges related to Effective Field Theory validity at the TeV scale. Finally, we outline the future prospects for $a_{\tau }$ at Belle II and the Future Circular Collider (FCC) stages. While FCC-hh in $PbPb$ mode provides a theoretically clean environment, its sensitivity remains limited to $\mathcal{O}(10^{-2})$. Conversely, the next generation of lepton facilities, specifically Belle II and FCC-ee, aims for the $\mathcal{O}(10^{-5})$ level, required to probe SM electroweak loop corrections. Long-term projections for a high-energy Muon Collider suggest a potential reach of $\mathcal{O}(10^{-6})$.

    hep-phhep-exSymmetry(2026)·1 citation
15. 15*

    Low-Multiplicity Jets as Probes of GeV-Scale Light-Quark-Coupled Particles

    Carlos Henrique de Lima🇨🇦 · David McKeen🇨🇦 · Maximilian Swiatlowski🇨🇦

    We propose a search at the LHC for GeV-scale particles coupling predominantly to light quarks based on low-multiplicity jets. The search targets production in association with a hard photon and uses the feature that a light gauge-singlet can only decay into a small number of hadronic channels, yielding jets with anomalously low charged-track multiplicity and mass compared to QCD jets at the same transverse momentum. We determine the sensitivity to scalar and pseudoscalar couplings to up-quarks, and suggest a data-driven estimate that reduces the sensitivity to jet modeling uncertainties. This search extends the reach to hadronically-coupled particles into a previously inaccessible regime.

    hep-phhep-ex0 citations
16. 16*

    Self-Interaction and Galactic Magnetic Field Bounds on Millicharged Magnetic Monopole Dark Matter

    Michael L. Graesser🇺🇸 · R. Andrew Gustafson🇺🇸

    A dark matter sector composed of magnetic monopoles of a dark U(1) symmetry having a small kinetic mixing with the Standard Model photon has a rich and interesting phenomenology. The model in itself is also of theoretical interest. Based on the temperature of the dark sector and scale of spontaneous symmetry breaking for this U(1), three phenomenologically distinct cases for this model of dark matter are discussed. In all cases, constraints on dark matter self-interactions are translated into constraints on the model parameters. As the magnetic monopoles acquire a small visible magnetic charge, the survival of galactic magnetic fields, known as the Parker effect, places further constraints on the mixing between the dark and visible sectors.

    hep-phastro-ph.GAhep-th2 citations
17. 17*

    Fine-Tuning Small Reasoning Models for Quantum Field Theory

    Nathaniel S. Woodward🇺🇸 · Zhiqi Gao🇺🇸 · Yurii Kvasiuk🇺🇸 · Kendrick M. Smith🇨🇦 · Frederic Sala🇺🇸 · Moritz Münchmeyer🇺🇸

    Despite the growing application of Large Language Models (LLMs) to theoretical physics, there is little academic exploration into how domain-specific physics reasoning ability develops while training these models. To investigate this, we perform the first academic fine-tuning study of small (7B-parameter) reasoning models dedicated specifically to theoretical physics. Because open-source verifiable training data required to train such capabilities is scarce, we developed a robust data generation pipeline that can both create synthetic problems and make existing human-authored problems suitable for model training. Selecting Quantum Field Theory (QFT) as our primary domain, we generated over 2,500 synthetic problems alongside a curated collection of human-adapted problems sourced from arXiv and standard pedagogical resources. We conduct both Reinforcement Learning (RL) and Supervised Fine-Tuning (SFT) experiments, benchmarking performance gains as well as generalization to other physics domains. We perform an extensive analysis of model chains-of-though before and after fine-tuning, to understand how reasoning errors evolve during RL and SFT. Finally, we publicly release our data pipeline, verifiable QFT training data, and $\sim$200M tokens of QFT reasoning traces.

    ↳ cs.LGcs.AIhep-phhep-th1 citation
18. 18*

    Cosmological constraints on TeV-scale dark matter subcomponents decaying between recombination and reionisation

    Markus R. Mosbech🇩🇪 · Cristina Benso🇩🇪 · Felix Kahlhoefer🇩🇪

    The Dark Ages and the Cosmic Dawn are an untapped well of information about the particle physics properties of dark matter, which may become accessible with future radio telescopes able to probe the 21-cm signal from atomic hydrogen. In this work we study the impact on cosmological observables of a dark matter subcomponent composed of TeV-scale particles that decay into electrons, photons or neutrinos with a lifetime shorter than the age of the universe. We re-evaluate constraints from the Cosmic Microwave Background (CMB) on these scenarios using the most recent data sets and estimate the sensitivity of future detections of the global 21-cm signal. Our main result is that the latter is potentially more sensitive to the effects of decaying dark matter with a lifetime $\tau \gtrsim 10^{15}\mathrm{s}$. This effect is strongest for the case of decays into neutrinos due to the different spectral distribution of the injected electromagnetic energy. For DM masses well above the TeV-scale, these differences become less pronounced and the sensitivity of both the CMB and the 21-cm signal depend primarily on the total amount of injected electromagnetic energy.

    ↳ astro-ph.COhep-ph0 citations
19. 19*

    On Global Embedding of Assisted Fibre Inflation

    George K. Leontaris🇬🇷 · Pramod Shukla🇮🇳

    Fibre inflation is one of the most attractive models realized in the type IIB orientifold compactification. It is embedded in the framework of L(arge) V(olume) S(cenarios) using a class of compactifying Calabi-Yau (CY) threefolds having K3-fibration. The standard single-field fibre inflation is driven by a fibre modulus which needs to travel a trans-Planckian distance of the order of $\mathcal{O}(5-8)$M${}_p$ in the effective moduli space. The global embedding attempts using concrete CY orientifold setups have shown that Kähler cone conditions can generically induce some significantly tight bounds on the inflaton range, especially in the presence of a Swiss-Cheese structure via an exceptional rigid divisor in the CY threefold. Such field range bounds usually obstruct the inflationary plateau, leading to insufficient number of efolds during the inflationary dynamics. In this context, we review our recent work about the possibility of assisting multiple fibre moduli such that the burden of traveling the required trans-Planckian distance could be shared by multiple fields, and successful inflation could be realized before hitting (or being too close to) their respective individual Kähler cone boundaries.

    ↳ hep-thhep-phPoS(2026)·3 citations
20. 20*

    Generalized PT-symmetric nonlinear Dirac equation: exact solitary waves solutions, stability and conservation laws

    Fernando Carreño-Navas · Siannah Peñaranda🇪🇸 · Renato Alvarez-Nodarse · Niurka R. Quintero

    We derive an exact solitary wave solution for the $\text{PTb}$-symmetric nonlinear Dirac equation with a scalar-scalar interaction. We consider a power-law nonlinearity of the form $|\bar{\Psi }\Psi {|}^k\Psi$ for positive values of $k$. The system's energy is conserved despite the presence of a gain-loss term, which is quantified by the parameter $\Lambda$. We show that the $\text{PTb}$-transition point is defined by the solution's existence condition and is independent of the nonlinearity exponent $k$. Furthermore, momentum is conserved, although neither the canonical momentum nor the charge is a conserved quantity. A notable result is that the stationary solution, obtained from the continuity equations, exhibits nonzero momentum in its rest frame. We also derive a moving soliton solution, where the gain-loss parameter allows the soliton's velocity to be precisely chosen so that the moving soliton possesses zero momentum. Finally, we establish that the presence of a gain-loss mechanism and higher-order nonlinearity restrict the stability domain of the solutions.

    ↳ nlin.PShep-phhep-thmath-ph+1Chaos(2026)·0 citations
21. 21*

    Geometric Bias and Centrality Dependence of Jet Quenching in High-Energy Nuclear Collisions

    Changle Sun🇨🇳 · Yichao Dang🇨🇳 · Shanshan Cao🇨🇳

    Jet quenching provides a valuable measure of the opacity of the quark-gluon plasma (QGP) produced in high-energy heavy-ion collisions. However, substantial suppression of charged hadron spectra is observed in highly peripheral collisions, despite the expectation of negligible jet-QGP interactions in this regime. To address this, we develop a HIJING-based initial condition model that accounts for the impact parameter dependence of both inelastic nucleon-nucleon (NN) collisions and the number of hard partonic scatterings per inelastic NN collision. This dependence introduces a geometric bias effect on the jet yield within a given centrality class of nucleus-nucleus (AA) collisions, suppressing the high-transverse-momentum hadron spectrum in peripheral collisions due to dilute nucleon overlap at large AA impact parameters. By combining this improved initial condition model with a linear Boltzmann transport model for jet-QGP interactions, we obtain a satisfactory description of the centrality dependence of charged hadron suppression in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV.

    ↳ nucl-thhep-phnucl-exUniverse(2026)·0 citations
22. 22*

    Exotic $T_{csJ}^{\ast }$ and $T_{c\bar{s}J}^{\ast }$ states and coupled-channel scattering at the $SU(3)$ flavour symmetric point from lattice QCD

    J. Daniel E. Yeo🇬🇧 · Christopher E. Thomas🇬🇧 · David J. Wilson🇬🇧

    Motivated by recent experimental observations of the flavour-exotic $T_{cs0}^{\ast }(2870{)}^0$ and $T_{c\bar{s}0}^{\ast }(2900)$, we present the first lattice QCD study of coupled-channel scattering of a charm meson with a light meson in the flavour-exotic sectors at the $SU(3{)}_f$ flavour symmetric point. Utilising five volumes with $m_{\pi }\approx 700$ MeV and employing large bases of meson-meson operators, finite-volume spectra are extracted and used to constrain infinite-volume scattering amplitudes with $J^P=\{0,1,2,3,4{\}}^{+}$ via the Lüscher formalism. In the flavour $6$ sector, each $S$-wave channel considered is found to be attractive with the scattering amplitudes having an associated pole singularity on an unphysical sheet below threshold, giving six flavour-exotic poles in the energy region constrained. In $J^P=0^{+}$ there is a virtual bound state and a resonance. The latter is identified with the $T_{cs0}^{\ast }(2870{)}^0$ and $T_{c\bar{s}0}^{\ast }(2900)$, appearing as one state in the $SU(3{)}_f$ flavour symmetric limit, and suggests the existence of an isospin-$\frac{1}{2}$ partner. In $J^P=1^{+}$ there are three poles, one of which is identified as a $J^P=1^{+}$ partner of the $T_{cs0}^{\ast }(2870{)}^0$ and $T_{c\bar{s}0}^{\ast }(2900)$, and $J^P=2^{+}$ contains one pole which is identified as their $J^P=2^{+}$ partner. Only mild interactions and no poles are seen in the $J^P=\{3,4{\}}^{+}$ scattering amplitudes. In the flavour $\overline{15}$ sector, weak interactions are observed in $J^P=\{0,1,2,3,4{\}}^{+}$ with no well-determined poles in the energy region constrained.

    ↳ hep-lathep-ph2 citations
23. 23*

    Finite-density equation of state of hot QCD using the complex Langevin equation

    Michael Mandl🇦🇹 · Dénes Sexty🇦🇹 · Daniel Unterhuber🇦🇹

    We present the results of continuum-extrapolated lattice simulations of quantum chromodynamics (QCD) above the crossover temperature and for unprecedentedly high baryon densities at the physical point, employing the complex Langevin equation. In particular, we determine the QCD equation of state by computing the baryon density as well as the pressure as functions of the baryon chemical potential and the temperature. Potential issues with wrong convergence of complex Langevin dynamics are under control and we indeed find agreement with previous lattice studies working at smaller chemical potentials, as well as with perturbative hard-thermal-loop calculations at high temperatures.

    ↳ hep-lathep-phhep-th1 citation
24. 24*

    Asymptotic charges as detectors and the memory effect in massive QED and perturbative quantum gravity

    Brett Oertel🇺🇸 · Ian Moult🇺🇸 · Sabrina Pasterski🇨🇦

    It has been shown that there are an infinite set of asymptotic symmetries in quantum gravity and QED, and this has been extended to dressed states in some cases. Here we rederive these statements in terms of detectors in order to clarify, confirm, and generalize these results to include external hard gravitons. Using detectors and including the full t dependence in Faddeev-Kulish dressings allows us to correct discrepancies in the literature and make new statements. We show that Faddeev-Kulish dressings correctly encode the memory effect in the 'in' and 'out' scattering Fock spaces. We find a physical contribution to the memory eigenvalues arising from the dressings in both cases.

    ↳ hep-thhep-ph4 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.