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Nuclear Theory·nucl-th

Monday·December 25, 2023

10 papers—4 primary·6 cross-listed

All10Primary4Cross-lists6
  1. 05

    [Submitted on 20 Dec 2023] (cross-list from hep-ph)

    iDMEu: An initiative for Dark Matter in Europe and beyond

    Marco Cirelli🇫🇷 · Caterina Doglioni🇬🇧 · Federica Petricca🇩🇪

    We introduce the initiative for Dark Matter in Europe and beyond (iDMEu), a collective effort by a group of particle and astroparticle physicists to set up an online resource meta-repository, a common discussion platform and a series of meetings on everything concerning Dark Matter. This document serves as a status report as well as a citable item concerning iDMEu.

    Comments:
    5 pages. Proceedings of the TAUP 2023 conference
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Cosmology and Nongalactic Astrophysics (astro-ph.CO); Astrophysics of Galaxies (astro-ph.GA); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    2312.14192 [pdf]
    PoS(2024)·1 citation
  2. 06

    [Submitted on 22 Dec 2023] (cross-list from hep-lat)

    Numerical evidence for fractional topological objects in SU(3) gauge theory

    Jackson A. Mickley🇦🇺 · Waseem Kamleh🇦🇺 · Derek B. Leinweber🇦🇺

    The continued development of models that propose the existence of fractional topological objects in the Yang-Mills vacuum has called for a quantitative method to study the topological structure of gauge theory. We present an original numerical algorithm that can identify distinct topological objects in the nontrivial ground-state fields and approximate the net charge contained within them. This analysis is performed for colour at a range of temperatures crossing the deconfinement phase transition, allowing for an assessment of how the topological structure evolves with temperature. We find a promising consistency with the instanton-dyon model for the structure of the QCD vacuum at finite temperature. Several other quantities, such as object density and radial size, are also analysed to elicit a further understanding of the fundamental structure of ground-state gluon fields.

    Comments:
    25 pages, 16 figures, version accepted for publication
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2312.14340 [pdf]
    PRD(2024)·8 citations
  3. 07

    [Submitted on 22 Dec 2023] (cross-list from hep-ph)

    Heavy flavor transport and observables in heavy-ion collisions within the MARTINI+MUSIC framework

    Manu Kurian🇨🇦 · Mayank Singh🇺🇸 · Sangyong Jeon🇨🇦 · Charles Gale🇨🇦

    We study the transport dynamics of charm quarks within an expanding quark-gluon plasma for Pb+Pb collisions at 2.76 TeV. The analysis incorporates the hydrodynamical approach-MUSIC with fluctuating IP-Glasma initial state and Bayesian-quantified viscous coefficients. We study the interaction strength of charm quarks in the medium, including elastic collisional processes with medium constituents, gluon emission processes, and the impact of non-perturbative interactions on heavy quark transport. Further, we analyze the dynamics of heavy flavors using a hybrid framework that incorporates the MARTINI event generator, with PYTHIA8.1 for the initial production of heavy quarks, and Langevin dynamics to describe the evolution of heavy quarks.

    Comments:
    4 pages, 2 figures, Contribution to the proceedings of the "Hot Quarks 2022 (HQ2022)"
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2312.14354 [pdf]
    0 citations
  4. 08

    [Submitted on 22 Dec 2023] (cross-list from hep-ph)

    Dynamically generated axial-vector meson resonance in the chiral symmetry restored vacuum

    Jisu Kim🇰🇷 · Su Houng Lee🇰🇷

    We study the modification of the properties of the axial-vector meson, dynamically generated through the unitarization procedure, in the vacuum where the chiral symmetry is restored. This is accomplished by scaling the pion decay constant as the chiral order parameter while keeping the other input parameters fixed. We find that the mass and width of the axial-vector meson reduce to those of the vector meson, as anticipated by the Weinberg sum rules. The findings are consistent with the results of a recent QCD sum rule calculation, wherein the chiral order parameter is expressed through chiral symmetry-breaking four-quark operators, leading to the mass-squared difference scaling in proportion to variations in the chiral order parameter. We calculate the scaling behavior for the mass differences obtained from the unitarization method using both the physical and massless pion masses.

    Comments:
    4 pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2312.14403 [pdf]
    0 citations
  5. 09

    [Submitted on 22 Dec 2023] (cross-list from hep-ph)

    Hot spots in a proton

    S. Demirci🇫🇮 · T. Lappi🇫🇮 · S. Schlichting🇩🇪

    We explore the consequences of gluonic hot spots inside the proton for the initial eccentricities in a proton-nucleus collision, and the constraints on the parameters describing these hot spots from coherent and incoherent exclusive vector meson production cross sections in deep inelastic scattering. We show that geometric fluctuations of hot spots inside the proton are the dominant source of eccentricity whereas color charge fluctuations only give a negligible correction. We find that the coherent cross section is sensitive to both the size of the target and the structure of the probe. The incoherent cross section is dominated by color fluctuations at small transverse momentum transfer (t), by proton and hot spot sizes as well as the structure of the probe at medium -t and again by color fluctuations at large -t.

    Comments:
    4 pages, 2 figures, Proceedings article for talk by T.L. at Quark Matter 2023
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2312.14585 [pdf]
    EPJ Web Conf.(2024)·1 citation
  6. 10

    [Submitted on 22 Dec 2023] (cross-list from hep-ph)

    Thermalization and quark production in spatially homogeneous systems of gluons

    Sergio Barrera Cabodevila🇪🇸 · Carlos A. Salgado🇪🇸 · Bin Wu🇪🇸

    We first assemble a full set of the Boltzmann Equation in Diffusion Approximation (BEDA) for studying thermalization/hydrodynamization and quark production in out of equilibrium systems. We then discuss thermalization and the production of three flavors of massless quarks in spatially homogeneous systems initially filled only with gluons. A complete parametric understanding for thermalization and quark production is obtained for both initially very dense or dilute systems, which are complemented by detailed numerical simulations. For initial distributions more relevant for heavy-ion collisions, the complete thermal equilibration is found to be significantly delayed by considering quark production.

    Comments:
    4 pages, 3 figures, contribution to the proceedings of the 30th International Conference on Ultra-relativistic Nucleus-Nucleus Collisions (Quark Matter 2023)
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2312.14594 [pdf]
    EPJ Web Conf.(2024)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE