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Nuclear Theory·nucl-th

Wednesday·May 24, 2023

11 papers—4 primary·7 cross-listed

All11Primary4Cross-lists7
  1. 05

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

    Chiral magnetic effect in a cylindrical domain

    Matteo Buzzegoli🇺🇸 · Kirill Tuchin🇺🇸

    We compute the chiral magnetic effect (CME) in a cylindrical region coaxial with the external magnetic field. As the boundary condition we require vanishing of the radial component of the electric current on the cylinder side wall. We find that when the magnetic length is comparable to or larger than the cylinder radius, the CME is suppressed compared to the corresponding result in an infinite medium. As a result, for a given cylinder radius, the suppression is stronger in weak fields. We argue that the electric current generated by the CME vanishes at the cylinder wall and monotonically increases toward the symmetry axis.

    Comments:
    13 pages, 6 figures, final version published in PRD, typos
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2305.13149 [pdf]
    PRD(2023)·4 citations
  2. 06

    [Submitted on 16 May 2023] (cross-list from astro-ph.HE)

    Rescaling strange-cluster stars and its implications on gravitational-wave echoes

    Chen Zhang🇨🇳 · Yong Gao🇨🇳 · Cheng-Jun Xia🇨🇳 · Renxin Xu🇨🇳

    Solid states of strange-cluster matter called strangeon matter can form strangeon stars that are highly compact. We show that strangeon matter and strangeon stars can be recast into dimensionless forms by a simple reparametrization and rescaling, through which we manage to maximally reduce the number of degrees of freedom. With this dimensionless scheme, we find that strangeon stars are generally compact enough to feature a photon sphere that is essential to foster gravitational-wave (GW) echoes. Rescaling the dimension back, we illustrate its implications on the expanded dimensional parameter space, and calculate the GW echo frequencies associated with strangeon stars, showing that the minimum echo frequency is kHz for empirical parameter space that satisfies the GW170817 constraint, and can reduce to Hertz at the extended limit.

    Comments:
    8 pages, 6 figures. Published version. Typo fixed
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2305.13323 [pdf]
    PRD(2023)·24 citations
  3. 07

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

    The Multiplicity Scaling of the Fragmentation Function

    Zhong-Bo Kang🇺🇸 · Robert Kao🇺🇸 · Andrew J. Larkoski🇺🇸

    The single-particle inclusive fragmentation function and the particle multiplicity are observables of fundamental importance in studying properties of quantum chromodynamics at colliders. It is well-known that at high energies, the multiplicity distribution satisfies KNO scaling in which all moments are proportional to powers of the mean multiplicity. We prove that, under weak assumptions, the leading dependence of the fragmentation function on multiplicity is itself a kind of KNO scaling in which all moments are inversely proportional to powers of the mean multiplicity. This scaling with multiplicity additionally accounts for the dominant dependence on collision energy in the fragmentation function. The proof relies crucially on properties of the fragmentation function conditioned on the total multiplicity and application of the Stieltjes moment problem. In the process, we construct a novel basis of the fragmentation function expressed as an overall exponential suppression times a series of Laguerre polynomials. We study this scaling of the fragmentation function in experimental electron-position collision data and observe that residual scale violations are significantly reduced.

    Comments:
    5 + 2 pages, 2 + 2 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2305.13359 [pdf]
    PRD(2024)·4 citations
  4. 08

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

    How Macroscopic Limits on Neutron Star Baryon Loss Yield Microscopic Limits on Non-Standard-Model Baryon Decay

    Jeffrey M. Berryman🇺🇸 · Susan Gardner🇺🇸 · Mohammadreza Zakeri🇺🇸

    We investigate how our baryon-loss limits from anomalous binary-pulsar period lengthening can be interpreted microscopically to yield specific constraints on the particle physics of baryon number violation within a neutron star. We focus on the possibility of anomalous baryon disappearance via dark baryon processes and on scenarios in which the produced dark-sector particles do not survive to influence the response of the star to baryon-number-violating effects. We flesh out the conditions for which this may occur, as well as other key assumptions. We then turn to the analysis of particle processes in the dense nuclear medium found at the core of a neutron star, employing the techniques of relativistic mean-field theory. Using our study of in-medium effects and limits on macroscopic baryon number violation we extract limits on in-vacuum baryon-number-violating processes, and we determine them for various equations of state. We conclude by noting the implications of our results for models of dark-sector-enabled baryogenesis.

    Comments:
    Published version, 87 pages, 18 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    2305.13377 [pdf]
    PRD(2024)·15 citations
  5. 09

    [Submitted on 22 May 2023] (cross-list from astro-ph.HE)

    Fluid pulsation modes and tidal deformability of anisotropic strange stars in light of the GW event

    José D. V. Arbañil · Cesar V. Flores · César H. Lenzi · Juan M. Z. Pretel

    The effects of the anisotropy on the fluid pulsation modes adopting the so-called Cowling approximation and tidal deformability of strange quark stars are investigated by using the numerical integration of the hydrostatic equilibrium, nonradial oscillations, and tidal deformability equations, being these equations modified from their standard form to include the anisotropic effects. The fluid matter inside the compact stars is described by the MIT bag model equation of state. For the anisotropy profile, we consider a local anisotropy that is both regular at the center and null at the star's surface. We find that the effect of the anisotropy is reflected in the fluid pulsation modes and tidal deformability. Finally, we analyze the correlation between the tidal deformability of the GW event with the anisotropy.

    Comments:
    To appear in PRD
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    2305.13468 [pdf]
    PRD(2023)·20 citations
  6. 10

    [Submitted on 23 May 2023] (cross-list from hep-ph)

    Electromagnetic form factors for nucleons in short-range correlations

    Wanli Xing🇦🇺 · Xuan-Gong Wang🇦🇺 · Anthony W. Thomas🇦🇺

    Recent experimental studies have led to the suggestion that short-range correlations may be a major contributor to the nuclear EMC effect. This hypothesis requires that the structure function for nucleons involved in short-range correlations should be heavily suppressed compared to that of a free nucleon. Based on calculations performed within an AdS/QCD motivated, light-front quark-diquark model, we find that this large suppression of the nucleon structure function leads to a strong suppression of the nucleon elastic form factors.

    Comments:
    6 pages, 6 figures, 2 tables
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2305.13666 [pdf]
    PLB(2023)·8 citations
  7. 11

    [Submitted on 23 May 2023] (cross-list from hep-ph)

    Vector quarkonia at the LHC with JETHAD: A high-energy viewpoint

    Francesco Giovanni Celiberto🇪🇸

    In this review we discuss and extend the study of the inclusive production of vector quarkonia, and , emitted with large transverse momenta and rapidities at the LHC. We adopt the novel ZCW19 determination to depict the quarkonium production mechanism at the next-to-leading level of perturbative QCD. This approach is based on the nonrelativistic QCD formalism well adapted to describe the production of a quarkonium state from the collinear fragmentation of a gluon or a constituent heavy quark at the lowest energy scale. We rely upon the NLL/NLO hybrid high-energy and collinear factorization for differential cross sections, where the standard collinear formalism is enhanced by the BFKL resummation of next-to-leading energy logarithms arising in the -channel. We employ the JETHAD method to analyze the behavior of rapidity distributions for double inclusive vector-quarkonium and inclusive vector-quarkonium plus jet emissions. We discovered that the natural stability of the high-energy series, previously observed in observables sensitive to the emission of hadrons with heavy flavor detected in the rapidity acceptance of LHC barrel calorimeters, becomes even more manifest when these particles are tagged in forward regions covered by endcaps. Our findings brace the important message that vector quarkonia at the LHC via the hybrid factorization offer a unique chance to perform precision studies of high-energy QCD, as well as an intriguing opportunity to shed light on the quarkonium production puzzle.

    Comments:
    42 pages, 8 figures, 526 references. Invited review article. Chapter I of the review pentalogy "Heavy hadrons with JETHAD: A high-energy viewpoint"
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2305.14295 [pdf]
    Universe(2023)·35 citations

Affiliations

first authorsco-authorsvia INSPIRE