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Nuclear Theory·nucl-th

Friday·March 21, 2025

12 papers—5 primary·7 cross-listed

All12Primary5Cross-lists7
  1. 06

    [Submitted on 19 Mar 2025] (cross-list from hep-ph)

    Suppression of elliptic anisotropy inside jets: A new perspective for jet quenching

    Meng-Quan Yang🇨🇳 · Wei-Xi Kong🇨🇳 · Peng Ru🇨🇳 · Ben-Wei Zhang🇨🇳

    Particle azimuthal anisotropies inside jets, defined within the momentum plane perpendicular to the jet axis, carry the information of the QCD cascade process for jet formation. In this work, we propose to measure the medium-induced modifications of the elliptic anisotropy inside jets in relativistic heavy-ion collisions to provide novel insight into the jet quenching phenomenon. By simulating the jet propagation in the hot and dense nuclear medium with a Linear Boltzmann Transport model, we observe a de-correlation in the two-particle azimuthal angular distribution for inclusive jet production in AA collisions relative to that in pp collisions, which results in significant suppression of the in-jet elliptic anisotropy coefficient . This phenomenon arises from the stochastic and strong interactions with the thermal QGP medium undergone by the jet particles. Furthermore, the nuclear modifications of the in-jet are found to be sensitive to the medium properties in the model study, which provide a potential probe for the jet tomography of nuclear matter.

    Comments:
    7 pages, 6 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2503.15042 [pdf]
    PLB(2025)·1 citation
  2. 07

    [Submitted on 19 Mar 2025] (cross-list from nucl-ex)

    NuPECC Long Range Plan 2024 for European Nuclear Physics

    NuPECC (Nuclear Physics European Collaboration Committee)

    The Nuclear Physics European Collaboration Committee ( NuPECC, http://nupecc.org/ ) hosted by the European Science Foundation represents today a large nuclear physics community from 23 countries, 3 ESFRI (European Strategy Forum for Research Infrastructures) nuclear physics infrastructures and ECT* (European Centre for Theoretical Studies in Nuclear Physics and Related Areas), as well as from 4 associated members and 10 observers. As stated in the NuPECC Terms of Reference one of the major objectives of the Committee is: "on a regular basis, the Committee shall organise a consultation of the community leading to the definition and publication of a Long Range Plan (LRP) of European nuclear physics". To this end, NuPECC has in the past produced five LRPs: in November 1991, December 1997, April 2004, December 2010, and November 2017. The LRP, being the unique document covering the whole nuclear physics landscape in Europe, identifies opportunities and priorities for nuclear science in Europe and provides national funding agencies, ESFRI, and the European Commission with a framework for coordinated advances in nuclear science. It serves also as a reference document for the strategic plans for nuclear physics in the European countries.

    Comments:
    186 pages, 70 MB interactive version with many figures, typos corrected, again typo corrections (June 2025)
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2503.15575 [pdf]
    12 citations
  3. 08

    [Submitted on 19 Mar 2025] (cross-list from cond-mat.stat-mech)

    Phase transitions and finite-size effects in integrable virial statistical models

    Xin An🇧🇪 · Francesco Giglio🇬🇧 · Giulio Landolfi🇮🇹

    We analyze thermodynamic models for fluid systems in equilibrium based on a virial expansion of the internal energy in terms of the volume density. We prove that the models, formulated for finite-size systems with particles, are exactly solvable to any expansion order, as expectation values of physical observables (e.g., volume density) are determined from solutions to nonlinear C-integrable partial differential equations (PDEs) of hydrodynamic type. In the limit , phase transitions emerge as classical shock waves in the space of thermodynamic variables. Near critical points, we argue that the volume density exhibits a scaling behavior consistent with the Universality Conjecture in viscous transport PDEs. As an application, we employ our framework to nuclear and quark matter, constructing a global quantum chromodynamics (QCD) phase diagram that reveals critical points for the nuclear liquid-gas transition and the hadron gas-quark-gluon plasma transition. We demonstrate how finite-size effects smear critical signatures, implying their potential impact on the search for the QCD critical point.

    Comments:
    8 pages, 4 figures. Version accepted by PRE
    Subjects:
    Statistical Mechanics (cond-mat.stat-mech); High Energy Physics — Theory (hep-th); nlin.SI (nlin.SI); Nuclear Theory (nucl-th)
    arXiv:
    2503.15719 [pdf]
    PRE(2026)·2 citations
  4. 09

    [Submitted on 20 Mar 2025] (cross-list from quant-ph)

    Constraint Phase Space Formulations for Finite-State Quantum Systems: The Relation between Commutator Variables and Complex Stiefel Manifolds

    Youhao Shang · Xiangsong Cheng · Jian Liu

    We have recently developed the \textit{constraint} coordinate-momentum \textit{phase space} (CPS) formulation for finite-state quantum systems. It has been implemented for the electronic subsystem in nonadiabatic transition dynamics to develop practical trajectory-based approaches. In the generalized CPS formulation for the mapping Hamiltonian of the classical mapping model with commutator variables (CMMcv) method [\textit{J. Phys. Chem. A} \textbf{2021}, 125, 6845-6863], each {connected} component of the generalized CPS is the \textit{complex Stiefel manifold} labeled by the eigenvalue set of the mapping kernel. Such a phase space structure allows for exact trajectory-based dynamics for pure discrete (electronic) degrees of freedom (DOFs), where the equations of motion of each trajectory are isomorphic to the time-dependent Schrödinger equation. We employ covariant kernels {within the generalized CPS framework} to develop two approaches that naturally yield exact evaluation of time correlation functions (TCFs) for pure discrete (electronic) DOFs. In addition, we briefly discuss the phase space mapping formalisms where the contribution of each trajectory to the integral expression of the {TCF} of population dynamics is strictly positive semi-definite. The generalized CPS formulation also indicates that the equations of motion in phase space mapping model I of our previous work [\textit{J. Chem. Phys.} \textbf{2016}, 145, 204105; \textbf{2017}, 146, 024110; \textbf{2019}, 151, 024105] lead to a complex Stiefel manifold . It is expected that the generalized CPS formulation has implications for simulations of both nonadiabatic transition dynamics and many-body quantum dynamics for spins/bosons/fermions.

    Subjects:
    Quantum Physics (quant-ph); Mathematical Physics (math-ph); math.MP (math.MP); Nuclear Theory (nucl-th); physics.chem-ph (physics.chem-ph); Computational Physics (physics.comp-ph)
    arXiv:
    2503.16062 [pdf]
    Fund.Res.(2026)·3 citations
  5. 10

    [Submitted on 20 Mar 2025] (cross-list from hep-ph)

    Inclusive photoproduction in ultraperipheral collisions

    Patricia Gimeno-Estivill🇫🇮 · Tuomas Lappi🇫🇮 · Heikki Mäntysaari🇫🇮

    We compute the differential cross section for inclusive production in ultraperipheral collisions within the Color Glass Condensate framework. Our predictions are found to be in relatively good agreement with the CMS data at small transverse momentum, which is the region of validity of our approach. Furthermore, we quantify saturation effects by a nuclear modification ratio for photoproduction and examine both analytically and numerically the collinear factorization limit of the differential photoproduction cross section.

    Comments:
    Public code in https://github.com/patgies/inclusive-D0-UPC
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2503.16108 [pdf]
    PRD(2025)·12 citations
  6. 11

    [Submitted on 20 Mar 2025] (cross-list from hep-ph)

    Unveiling the sea: universality of the transverse momentum dependent quark distributions at small

    Paul Caucal🇫🇷 · Marcos Guerrero Morales🇺🇸 · Edmond Iancu🇫🇷 · Farid Salazar🇺🇸 · Feng Yuan🇫🇷

    Within the Colour Glass Condensate effective theory, we demonstrate that back-to-back dijet correlations in dilute-dense collisions involving a small- quark from the nuclear target can be factorised in terms of universal transverse momentum dependent distributions (TMDs) for the sea quarks. Two building blocks are needed to construct all these TMDs at the operator level: the sea quark TMD operator which appears in semi-inclusive Deep-Inelastic Scattering (SIDIS) or in the Drell-Yan process and the elastic -matrix for a quark-antiquark dipole. Compared to SIDIS, the saturation effects are stronger for dijet production in forward proton-nucleus collisions, due to additional scattering in the initial and final state, effectively resulting in a larger value for the nuclear saturation momentum.

    Comments:
    12 pages, 7 figures, version accepted for publication in Physics Letters B
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2503.16162 [pdf]
    PLB(2026)·13 citations
  7. 12

    [Submitted on 20 Mar 2025] (cross-list from astro-ph.HE)

    Precision cross-sections for advancing cosmic-ray physics and other applications: a comprehensive programme for the next decade

    D. Maurin🇫🇷 · L. Audouin🇫🇷 · E. Berti🇮🇹 · P. Coppin🇨🇭 · M. Di Mauro🇮🇹 · P. von Doetinchem🇺🇸 · F. Donato🇮🇹 · C. Evoli🇮🇹 · Y. Génolini🇫🇷 · P. Ghosh🇺🇸 · I. Leya🇨🇭 · M. J. Losekamm🇩🇪 and 23 other authors

    Cosmic-ray physics in the GeV-to-TeV energy range has entered a precision era thanks to recent data from space-based experiments. However, the poor knowledge of nuclear reactions, in particular for the production of antimatter and secondary nuclei, limits the information that can be extracted from these data, such as source properties, transport in the Galaxy and indirect searches for particle dark matter. The Cross-Section for Cosmic Rays at CERN workshop series has addressed the challenges encountered in the interpretation of high-precision cosmic-ray data, with the goal of strengthening emergent synergies and taking advantage of the complementarity and know-how in different communities, from theoretical and experimental astroparticle physics to high-energy and nuclear physics. In this paper, we present the outcomes of the third edition of the workshop that took place in 2024. We present the current state of cosmic-ray experiments and their perspectives, and provide a detailed road map to close the most urgent gaps in cross-section data, in order to efficiently progress on many open physics cases, which are motivated in the paper. Finally, with the aim of being as exhaustive as possible, this report touches several other fields -- such as cosmogenic studies, space radiation protection and hadrontherapy -- where overlapping and specific new cross-section measurements, as well as nuclear code improvement and benchmarking efforts, are also needed. We also briefly highlight further synergies between astroparticle and high-energy physics on the question of cross-sections.

    Comments:
    122 pages, 24 figures, 8 tables (figs 6 and 9 updated + additional references: matches Physics Report's version
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2503.16173 [pdf]
    Phys.Rept.(2026)·23 citations

Affiliations

first authorsco-authorsvia INSPIRE