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Nuclear Theory·nucl-th

Friday·November 30, 2018

10 papers—4 primary·6 cross-listed

All10Primary4Cross-lists6
  1. 01

    [Submitted on 29 Nov 2018]

    Comparison of cuprates and nuclear matter pairing properties. Quartet (alpha-particle) condensation in nuclear systems

    P. Schuck (1) ((1) Institut de Physique Nucléaire, Orsay, France and Laboratoire de Physique et de Modélisation des Milieux Condensés, Grenoble, France)

    A comparison of pairing properties in cuprates and nuclear matter is briefly discussed. Quartet (alpha-particle) condensation is a very important aspect of nuclear physics. The physics of the Hoyle state in 12 C will be outlined and its crucial role for the existence of life on earth explained.

    Comments:
    Contribution to EuNPC2018-conference
    Subjects:
    Nuclear Theory (nucl-th); Strongly Correlated Electrons (cond-mat.str-el); Superconductivity (cond-mat.supr-con)
    arXiv:
    1811.12018 [pdf]
    Nuovo Cim.C(2019)·0 citations
  2. 02

    [Submitted on 29 Nov 2018]

    Jet tomography in high-energy nuclear collisions

    Ben-Wei Zhang🇨🇳 · Guo-Yang Ma🇨🇳 · Wei Dai🇨🇳 · Sa Wang🇨🇳 · Shan-Liang Zhang🇨🇳

    When an energetic parton traversing the QCD medium, it may suffer multiple scatterings and lose energy. This jet quenching phenomenon may lead to the suppression of leading hadron productions as well as medium modifications of full jet observables in heavy-ion collisions. In this talk we discuss the nuclear modification factors and yield ratios of identified meson such as , , , , and as well as meson at large in A+A collisions at the next-to-leading order (NLO) with high-twist approach of parton energy loss. Then we discuss a newly developed formalism of combing NLO matrix elements and parton shower (PS) for initial hard production with parton energy loss in the QGP, and its application in investigating massive gauge boson (/) tagged jet productions and dijet correlations in Pb+Pb at the LHC.

    Comments:
    Invited talk at ISMD2018 (the International Symposium on Multiparticle Dynamics), the National University of Singapore, Singapore. Submitted to the cofference proceedings. 10 pages, 12 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1811.12093 [pdf]
    EPJ Web Conf.(2019)·4 citations
  3. 03

    [Submitted on 29 Nov 2018]

    Wigner-Eckart Theorem and the False EDM of Hg

    Wolfgang Klassen🇨🇦 · Jeffery W. Martin🇨🇦 · Guillaume Pignol🇫🇷

    In neutron electric dipole moment experiments, 199Hg is used as a comagnetometer. The comagnetometer suffers from a false EDM arising in leading order from a gradient dBz/dz in the magnetic field. Our work concerns higher-order multipole corrections to the false EDM of 199Hg. We show that for spherical traps, all higher-order multipole are identically zero. We further show that for the usual cylindrical traps used in EDM experiments, selection of quasi-spherical dimensions for the trap can reduce the higher-order contributions. The results are another indication that trap geometry is an important consideration for experiments desiring to control this systematic effect.

    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex); Instrumentation and Detectors (physics.ins-det)
    arXiv:
    1811.12262 [pdf]
    Nucl.Instrum.Meth.A(2019)·0 citations
  4. 04

    [Submitted on 29 Nov 2018]

    Distinguishing Quarks and Gluons in Pion and Kaon PDFs

    Kyle D. Bednar🇺🇸 · Ian C. Cloët🇺🇸 · Peter C. Tandy🇺🇸

    The leading-twist parton distribution functions of the pion and kaon are calculated for the first time using a rainbow-ladder truncation of QCD's Dyson-Schwinger equations (DSEs) that self-consistently sums all planar diagrams. The non-perturbative gluon dressing of the quarks is thereby correctly accounted for, which in practice means solving the inhomogeneous Bethe-Salpeter equation (BSE) for the quark operator that defines the spin-independent quark distribution functions. An immediate consequence of using this dressed vertex is that gluons carry 35% of the pion's and 30% of the kaon's light-cone momentum, with the remaining momentum carried by the quarks. The scale associated with these DSE results is GeV. The gluon effects generated by the inhomogeneous BSE are inherently non-perturbative and cannot be mimicked by the perturbative QCD evolution equations. A key consequence of this gluon dressing is that the valence quarks have reduced support at low-to-intermediate , where the gluons dominate, and increased support at large . As a result, our DSE calculation of the pion's valence quark distribution is in excellent agreement with the Conway et al. pion-induced Drell-Yan data, but nevertheless exhibits the behavior as predicted by perturbative QCD.

    Comments:
    Improved discussion of results with results unchanged
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1811.12310 [pdf]
    PRL(2020)·72 citations

Affiliations

first authorsco-authorsvia INSPIRE