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Nuclear Theory·nucl-th

Wednesday·April 1, 2020

9 papers—3 primary·6 cross-listed

All9Primary3Cross-lists6
  1. 04

    [Submitted on 16 Mar 2020] (cross-list from hep-ph)

    Ultraperipheral nuclear interactions

    I.M. Dremin🇷🇺

    Large-distance ultraperipheral collisions of two relativistic ions are considered. The clouds of photons surrounding the ions are responsible for their distant electromagnetic interaction. The perturbative approach and the method of equivalent photons are described. It is shown that the total cross section of these collisions increases rapidly with increasing energy and is especially large for heavy ions. Some experimental data and their comparison with theoretical approaches are described. Further proposals are discussed.

    Comments:
    22 p. references added, Physics-Uspekhi, DOI:10.3367/UFNe.2020.03.038741
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2003.07414 [pdf]
    Phys.Usp.(2020)·7 citations
  2. 05

    [Submitted on 30 Mar 2020] (cross-list from hep-ph)

    Core meets corona: a two-component source to explain Lambda and anti-Lambda global polarization in semi-central heavy-ion collisions

    Alejandro Ayala🇲🇽 · Marco Alberto Ayala Torres🇲🇽 · Eleazar Cuautle🇲🇽 · Isabel Dominguez🇲🇽 · Marcos Aurelio Fontaine Sanchez🇲🇽 · Ivonne Maldonado🇲🇽 · E. Moreno-Barbosa🇲🇽 · P. A. Nieto-Marin🇲🇽 · M. Rodriguez-Cahuantzi🇲🇽 · Jordi Salinas🇲🇽 · Maria Elena Tejeda-Yeomans🇲🇽 · L. Valenzuela-Cazares🇲🇽

    We compute the Lambda and anti-Lambda global polarization in semi-central heavy-ion collisions modeling the source as consisting of a high-density core and a less dense corona. We show that when more Lambdas than anti-Lambdas are produced in the corona, and this is combined with a smaller number of Lambdas coming from the core, as compared to those coming from the corona, an amplification effect for the anti-Lambda with respect to that of Lambda polarization can occur. This amplification becomes more important for lower collision energies and quantitatively accounts for the Lambda and anti-Lambda polarizations measured by the STAR beam energy scan.

    Comments:
    6 pages, 5 figures. Version to appear in Phys. Lett. B
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2003.13757 [pdf]
    PLB(2020)·33 citations
  3. 06

    [Submitted on 31 Mar 2020] (cross-list from hep-ph)

    Connecting fluctuation measurements in heavy-ion collisions with the grand-canonical susceptibilities

    Volodymyr Vovchenko🇺🇸 · Oleh Savchuk🇺🇦 · Roman V. Poberezhnyuk🇺🇦 · Mark I. Gorenstein🇺🇦 · Volker Koch🇺🇸

    We derive the relation between cumulants of a conserved charge measured in a subvolume of a thermal system and the corresponding grand-canonical susceptibilities, taking into account exact global conservation of that charge. The derivation is presented for an arbitrary equation of state, with the assumption that the subvolume is sufficiently large to be close to the thermodynamic limit. Our framework -- the subensemble acceptance method (SAM) -- quantifies the effect of global conservation laws and is an important step toward a direct comparison between cumulants of conserved charges measured in central heavy ion collisions and theoretical calculations of grand-canonical susceptibilities, such as lattice QCD. As an example, we apply our formalism to net-baryon fluctuations at vanishing baryon chemical potentials as encountered in collisions at the LHC and RHIC.

    Comments:
    7 pages, 2 figures, published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2003.13905 [pdf]
    PLB(2020)·85 citations
  4. 07

    [Submitted on 31 Mar 2020] (cross-list from hep-ph)

    Topological term, QCD anomaly, and the eta' chiral soliton lattice in rotating baryonic matter

    Kentaro Nishimura🇯🇵 · Naoki Yamamoto🇯🇵

    We study the ground states of low-density hadronic matter and high-density color-flavor locked color superconducting phase in three-flavor QCD at finite baryon chemical potential under rotation. We find that, in both cases under sufficiently fast rotation, the combination of the rotation-induced topological term for the eta' meson and the QCD anomaly leads to an inhomogeneous condensate of the eta' meson, known as the chiral soliton lattice (CSL). We find that, when baryon chemical potential is much larger than isospin chemical potential, the critical angular velocity for the realization of the eta' CSL is much smaller than that for the pi_0 CSL found previously. We also argue that the eta' CSL states in flavor-symmetric QCD at low density and high density should be continuously connected, extending the quark-hadron continuity conjecture in the presence of the rotation.

    Comments:
    24 pages, 2 figures; v2: published version
    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:
    2003.13945 [pdf]
    JHEP(2020)·43 citations
  5. 08

    [Submitted on 31 Mar 2020] (cross-list from hep-lat)

    Valence-Quark Distribution of the Kaon and Pion from Lattice QCD

    Huey-Wen Lin🇺🇸 · Jiunn-Wei Chen🇹🇼 · Zhouyou Fan🇺🇸 · Jian-Hui Zhang🇨🇳 · Rui Zhang🇺🇸

    We present the first lattice-QCD calculation of the kaon valence-quark distribution functions using the large-momentum effective theory (LaMET) approach. The calculation is performed with multiple pion masses with the lightest one around 220 MeV, 2 lattice spacings and 0.12 fm, , and high statistics ranging from 11,600 to 61,312 measurements. We also calculate the valence-quark distribution of pion and find it to be consistent with the FNAL E615 experimental results, and our ratio of the quark PDF in the kaon to that in the pion agrees with the CERN NA3 experiment. We also make predictions of the strange-quark distribution of the kaon.

    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2003.14128 [pdf]
    PRD(2021)·114 citations
  6. 09

    [Submitted on 31 Mar 2020] (cross-list from quant-ph)

    Expression of relativistic expectation values of powers of in terms of Clebsch-Gordan coefficients

    Jean-Christophe Pain🇫🇷

    It is shown that, in the relativistic hydrogenic approximation, expectation values of the type can be expressed in terms of Clebsch-Gordan coefficients or symbols. This generalizes the results obtained by Varshalovich and Karpova [Opt. Spectrosc. 118, 1-5 (2015); Opt. Spektrosk. 118, 3-7] in the non-relativistic hydrogenic case.

    Comments:
    submitted to "Optics ans spectroscopy"
    Subjects:
    Quantum Physics (quant-ph); Nuclear Theory (nucl-th); Atomic Physics (physics.atom-ph)
    arXiv:
    2003.14197 [pdf]
    Opt.Spectrosc.(2020)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE