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Nuclear Theory·nucl-th

Thursday·December 21, 2023

10 papers—3 primary·7 cross-listed

All10Primary3Cross-lists7
  1. 04

    [Submitted on 19 Dec 2023] (cross-list from hep-ph)

    Advancing the understanding of energy-energy correlators in heavy-ion collisions

    João Barata🇺🇸 · Paul Caucal🇫🇷 · Alba Soto-Ontoso🇨🇭 · Robert Szafron🇺🇸

    We investigate the collinear limit of the energy-energy correlator (EEC) in a heavy-ion context. First, we revisit the leading-logarithmic (LL) resummation of this observable in vacuum following a diagrammatic approach. We argue that this route allows to naturally incorporate medium-induced effects into the all-orders structure systematically. As an example, we show how the phase-space constraints imposed by the medium on vacuum-like emissions can be incorporated into the LL result by modifying the anomalous dimensions. On the fixed-order side, we calculate the expansion of the in-medium EEC for a splitting using, for the first time, the exact matrix element. When comparing this result to previously used approximations in the literature, we find up to deviations in the regime of interest for jet quenching signatures. Energy loss effects are also quantified and further suppress the EEC at large angles. These semi-analytic studies are complemented with a phenomenological study using the jet quenching Monte Carlo JetMed. Finally, we argue that the imprint of medium-induced effects in energy-energy correlators can be enhanced by using an alternative definition that takes as input Lund primary declusterings instead of particles.

    Comments:
    36 pages, 13 figures, fixed plotting typo in Fig. 8
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    2312.12527 [pdf]
    JHEP(2024)·78 citations
  2. 05

    [Submitted on 19 Dec 2023] (cross-list from physics.chem-ph)

    Rationale for the Extrapolation Procedure in Selected Configuration Interaction

    Hugh G. A. Burton · Pierre-François Loos

    Selected configuration interaction (SCI) methods have emerged as state-of-the-art methodologies for achieving high accuracy and generating benchmark reference data for ground and excited states in small molecular systems. However, their precision relies heavily on extrapolation procedures to produce a final estimate of the exact result. Using the structure of the exact electronic energy landscape, we provide a rationale for the common linear extrapolation of the variational energy as a function of the second-order perturbative correction. In particular, we demonstrate that the energy gap and the coupling between the so-called internal and external spaces are the key factors determining the rate at which the linear regime is reached. Starting from first principles, we also derive a new non-linear extrapolation formula that improves the post-processing of data generated from SCI methods and can be applied to both ground- and excited-state energies.

    Comments:
    9 pages, 8 figures
    Subjects:
    physics.chem-ph (physics.chem-ph); cond-mat.mtrl-sci (cond-mat.mtrl-sci); Nuclear Theory (nucl-th)
    arXiv:
    2312.12530 [pdf]
    J.Chem.Phys.(2024)·10 citations
  3. 06

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

    Nuclear mass radius and pressure in the Skyrme model

    Alberto García Martín-Caro🇪🇸 · Miguel Huidobro🇪🇸 · Yoshitaka Hatta🇺🇸

    We compute the mass radius, scalar radius, tensor radius, baryon number radius and mechanical radius of nuclei with baryon number in the Skyrme model. The relations between these radii and the nuclear gravitational form factors are investigated. We also compute the `pressure' distribution and find that it is negative in the core region for all the nuclei with . This suggests that the way mechanical stability is achieved in nuclei is qualitatively different than in the nucleon.

    Comments:
    10 pages, 4 figures. 2 figures changed, 1 figure added for clarity. Other minor changes include an improved accuracy in numerical solutions, and addition of several references
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2312.12984 [pdf]
    PRD(2024)·20 citations
  4. 07

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

    Structure of the resonance

    Jiong-Jiong Liu🇨🇳 · Zhan-Wei Liu🇨🇳 · Kan Chen🇨🇳 · Dan Guo🇨🇳 · Derek B. Leinweber🇦🇺 · Xiang Liu🇨🇳 · Anthony W. Thomas🇦🇺

    We examine the internal structure of the through an analysis of lattice QCD simulations and experimental data within Hamiltonian effective field theory. Two scenarios are presented. The first describes the as a bare three-quark basis state, which mixes with the , , and meson-baryon channels. In the second scenario, the is dynamically generated from these isospin-0 coupled channels. The scattering data and the pole structures of the and the can be simultaneously described well in both scenarios. However, a comparison of the finite-volume spectra to lattice QCD calculations reveals significant differences between these scenarios, with a clear preference for the first case. Thus the lattice QCD results play a crucial role in allowing us to distinguish between these two scenarios for the internal structure of the .

    Comments:
    13 pages, 5 figures, 1 table; accepted by Phys. Rev. D
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    2312.13072 [pdf]
    PRD(2024)·15 citations
  5. 08

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

    Hadron Production in Ultra-relativistic Nuclear Collisions and Finite Baryon-Size Effects

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

    We investigate relative hadron yield production of various like and unlike mass particles in ultra-relativistic heavy ion collisions by employing a statistical thermal model with finite-sized baryons (antibaryons) to imitate the hard-core repulsive interactions leading to the excluded volume type effect. A strong evidence of strangeness suppression relative to the non-strange ones, mainly pions, particularly at higher energies is also observed. This study also indicates that at chemical freeze-out the particle ratios and strangeness suppression in the system obtained theoretically are sensitive to baryonic (antibaryonic) hard-core radius (). A comparison with earlier analysis involving the strangeness suppression effect is made where baryons and antibaryons were treated as point-like particles. The available experimental data showing energy dependence of various particle ratios are well described throughout the range of centre-of-mass energy (). The value of hard-core radius between 0.76 to 0.79 fm is found to fit the data quite well using minimization technique. Two different chemical freeze-out stages are found where the earlier one belongs to baryonic (hyperonic), antibaryonic (antihyperonic) states and the later one to mesonic degrees of freedom.

    Comments:
    10 pages, 13 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2312.13079 [pdf]
    J.Phys.G(2025)·10 citations
  6. 09

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

    An effective field theory of damped ferromagnetic systems

    Jingping Li🇺🇸

    Using the in-in formalism, we generalize the recently constructed magnetoelastic EFT arXiv:2112.13873 [hep-th] to describe the damping dynamics of ferromagnetic systems at long wavelengths. We find that the standard Gilbert damping term naturally arises as the simplest leading-order symmetry-consistent non-conservative contribution within the in-in framework. The EFT is easily generalized to scenarios with anisotropy and inhomogeneity. In particular, we find the classic Landau-Lifshitz damping term emerges when isotropy is broken by a constant external background field. This provides a first principle explanation for distinguishing the two types of damping dynamics that were originally constructed phenomenologically. Furthermore, the EFT framework could also incorporate intrinsic anisotropy of the material in a straightforward way using the spurion method. For systems with inhomogeneity such as nontrivial spin textures, we find that the leading order derivative correction yields the generalized Gilbert damping equations that were found in condensed matter literature. This shows that the EFT approach enables us to derive the form of higher-derivative-order corrections in a systematic way. Lastly, using the phonon-magnon coupling deduced in the magnetoelastic EFT, we are able to make a prediction for the generic form of the phononic contribution to the damping equation.

    Comments:
    14 pages; no figures
    Subjects:
    High Energy Physics — Theory (hep-th); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2312.13093 [pdf]
    1 citation
  7. 10

    [Submitted on 20 Dec 2023] (cross-list from astro-ph.HE)

    Photons from neutrinos: the gamma ray echo of a supernova neutrino burst

    Cecilia Lunardini🇺🇸 · Joshua Loeffler🇺🇸 · Mainak Mukhopadhyay🇺🇸 · Matthew J. Hurley🇺🇸 · Ebraheem Farag🇺🇸 · F. X. Timmes🇺🇸

    When a star undergoes core collapse, a vast amount of energy is released in a ~10 s long burst of neutrinos of all species. Inverse beta decay in the star's hydrogen envelope causes an electromagnetic cascade which ultimately results in a flare of gamma rays - an "echo" of the neutrino burst - at the characteristic energy of 0.511 MeV. We study the phenomenology and detectability of this flare. Its luminosity curve is characterized by a fast, seconds-long, rise and an equally fast decline, with a minute- or hour-long plateau in between. For a near-Earth star (distance D<1 kpc) the echo will be observable at near future gamma ray telescopes with an effective area of 10^3 cm^2 or larger. Its observation will inform us on the envelope size and composition. In conjunction with the direct detection of the neutrino burst, it will also give information on the neutrino emission away from the line of sight and will enable tests of neutrino propagation effects between the stellar surface and Earth.

    Comments:
    10 pages, 5 figures and 1 table. Description of the microphysics has been expanded; minor edits were made for clarity. This version matches the one to be published in the Astrophysical Journal
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2312.13197 [pdf]
    ApJ(2024)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE