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Nuclear Theory·nucl-th

Wednesday·June 28, 2023

6 papers—1 primary·5 cross-listed

All6Primary1Cross-lists5
  1. 02

    [Submitted on 26 Jun 2023] (cross-list from hep-ph)

    Parton Distributions from Boosted Fields in the Coulomb Gauge

    Xiang Gao🇺🇸 · Wei-Yang Liu🇺🇸 · Yong Zhao🇺🇸

    We propose a new method to calculate parton distribution functions (PDFs) from lattice correlations of boosted quarks and gluons in the Coulomb gauge. Compared to the widely used gauge-invariant Wilson-line operators, these correlations greatly simplify the renormalization thanks to the absence of linear power divergence. Besides, they enable access to larger off-axis momenta under preserved 3D rotational symmetry, as well as enhanced long-range precision that facilitates the Fourier transform. We verify the factorization formula that relates this new observable to the quark PDF at one-loop order in perturbation theory. Moreover, through a lattice calculation of the pion valence quark PDF, we demonstrate the aforementioned advantage and features of the Coulomb gauge correlation and show that it yields consistent result with the gauge-invariant method. This opens the door to a more efficient way to calculate parton physics on the lattice.

    Comments:
    5 pages, 4 figures, and the appendix
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    2306.14960 [pdf]
    PRD(2024)·46 citations
  2. 03

    [Submitted on 27 Jun 2023] (cross-list from hep-ph)

    Study of Baryon Number Transport Dynamics and Strangeness Conservation Effects Using -hadron Correlations

    Weijie Dong🇨🇳 · Xiaozhou Yu🇨🇳 · Siyuan Ping🇨🇳 · Xiatong Wu🇺🇸 · Gang Wang🇺🇸 · Huan Zhong Huang🇨🇳 · Zi-Wei Lin🇺🇸

    In nuclear collisions at RHIC energies, an excess of hyperons over is observed, indicating that carries a net baryon number despite and quarks being produced in pairs. The baryon number in could have been transported from the incident nuclei and/or produced in baryon-pair production of with other types of anti-hyperons, such as . To investigate these two scenarios, we propose to measure correlations between and , as well as between and anti-hyperons. We will use two versions, the default and string-melting, of a multiphase transport (AMPT) model to illustrate the method to measure the correlation and to demonstrate the general shape of the correlation. We will present the -hadron correlations from simulated + collisions at and , and discuss the dependence on collision energy and on the hadronization scheme in these two AMPT versions. These correlations can be used to explore the mechanism of baryon number transport and the effects of baryon number and strangeness conservation in nuclear collisions.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2306.15160 [pdf]
    Nucl.Sci.Tech.(2024)·8 citations
  3. 04

    [Submitted on 27 Jun 2023] (cross-list from nucl-ex)

    C+C scattering as the reference system for reaction cross section

    Shingo Tagami · Tomotsugu Wakasa · Masanobu Yahiro

    In our previous paper, we tested the chiral (Kyushu) folding model for C+C scattering, since the profile function in the Glauber mode is constructed for the system. We found that the folding model is reliable for reaction cross sections in ~MeV and ~MeV. Accurate data are available for C scattering on Be, C, Al targets in ~MeV. We determine matter radius of C from the accurate , using the Kyushu -matrix folding model. Our result is ~fm for C. The model is applied for the accurate data on C+Al scattering, and yields ~fm for Al. Our conclusion is that ~fm agrees with ~fm determined from interaction cross sections by Tanihata {\it et. al.}.

    Comments:
    arXiv admin note: text overlap with arXiv:2306.09609
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2306.15178 [pdf]
    2 citations
  4. 05

    [Submitted on 27 Jun 2023] (cross-list from hep-ph)

    Mission Target: Tetraquark Mesons of Flavour-Cryptoexotic Type

    Wolfgang Lucha🇦🇹

    Currently, flavour-cryptoexotic tetraquarks form the most common sort of all experimentally established exotic multiquark hadrons. This note points out a few promising concepts that should help improve theoretical (but, for several reasons, not quite straightforward) analyses of such kind of states: among others, their scope of application encompasses the strong interactions in the limit of (arbitrarily) large numbers of colours, and equally analytical and nonperturbative approaches to multiquark states.

    Comments:
    12 pages, 2 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2306.15474 [pdf]
    Universe(2023)·2 citations
  5. 06

    [Submitted on 27 Jun 2023] (cross-list from physics.atom-ph)

    Accurate determination of Li nuclear magnetic moments

    Krzysztof Pachucki · Vojtěch Patkóš · Vladimir A. Yerokhin

    We report an accurate determination of the nuclear magnetic dipole moments of Li from the measured ratio of the nuclear and the electron -factors in atomic Li. The obtained results significantly improve upon the literature values and stress the importance of reliable theoretical calculations of the nuclear shielding corrections.

    Subjects:
    Atomic Physics (physics.atom-ph); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2306.15514 [pdf]
    PLB(2023)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE