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Nuclear Theory·nucl-th

Friday·August 17, 2018

6 papers—4 primary·2 cross-listed

All6Primary4Cross-lists2
  1. 01

    [Submitted on 15 Aug 2018]

    Proton spectral functions in finite nuclei based on the extended Brueckner-Hartree-Fock approach

    Pei Wang · Peng Yin · Xinle Shang · Wei Zuo

    We have calculated the proton spectral functions in finite nuclei based on the local density approximation where the properties of finite nuclei and nuclear matter are calculated by the Skyrme-Hartree-Fock method and the extended Brueckner-Hartree-Fock approach, respectively. The scaled spectral function from our calculation is in good agreement with experimental results at small momenta while the difference between them becomes apparent at high momenta. Besides, a target dependence of the scaled proton spectral function is also obtained in our calculation as was observed in experiment. A further investigation indicates that the proportion of the high density region of the proton has a significant contribution to this target-dependent behavior since the spectral function in asymmetric nuclear matter increases significantly as a function of density.

    Comments:
    8 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1808.05301 [pdf]
    J.Phys.G(2018)·0 citations
  2. 02

    [Submitted on 16 Aug 2018]

    QCD Sum Rule for Open Strange Meson in Nuclear Matter

    Taesoo Song🇩🇪 · Tetsuo Hatsuda🇯🇵 · Su Houng Lee🇰🇷

    The properties of open strange meson in nuclear matter are estimated in the QCD sum rule approach. We obtain a relation between the in-medium mass and width of () in nuclear matter, and show that the upper limit of the mass shift is as large as -249 (-35) MeV. The spectral modification of the meson is possible to be probed by using kaon beams at J-PARC. Such measurement together with that of will shed light on how chiral symmetry is partially restored in nuclear matter.

    Comments:
    12 pages, 3 figures, accepted for publication in Phys. Lett. B
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1808.05372 [pdf]
    PLB(2019)·26 citations
  3. 03

    [Submitted on 16 Aug 2018]

    Renormalisation-group analysis of electromagnetic couplings in the pionless effective field theory

    A. N. Kvinikhidze🇬🇪 · M. C. Birse🇬🇧

    The Wilsonian renormalisation group is applied to a system of two nonrelativistic particles interacting via short-range forces and coupled to an external EM field. By demanding that a fully off-shell one-particle-irreducible 5-point amplitude is independent of the cutoff, a renormalisation group equation is derived for the interaction current density. This is solved to obtain the fixed point corresponding to the unitary limit. The scaling behaviour of perturbations around this point is analysed. Some of these terms are related by gauge invariance to terms in the effective-range expansion; others describe short-range physics that is not included in the two-body potential. We construct observables including the bound-state form factor and show how the scaling of the terms in the interaction current is reflected in the power counting for their contributions to observables.

    Comments:
    14 pages; comments and references added
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1808.05447 [pdf]
    EPJA(2018)·2 citations
  4. 04

    [Submitted on 16 Aug 2018]

    Deuteron disintegration by reactor antineutrinos

    L.M. Slad🇷🇺

    The existence of a new interaction involving the electron neutrino and the nucleons, which has received a convincing confirmation through a good agreement between the theoretical and experimental results concerning all observable processes with solar neutrinos, should also inevitably manifest itself in the deuteron disintegration by reactor antineutrinos neutral currents. In this paper, the analytical and numerical characteristics of such a disintegration are presented. The attention is drawn to the problem of finding the neutron registration efficiency, discussed in the preparation of the experiment at the Sudbury Neutrino Observatory and in a number of special studies, to the role of quenching gas in proportional counters with helium-3 and to three performed reactor experiments with heavy water.

    Comments:
    8 pages. Significant additions, editorial changes
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1808.05516 [pdf]
    IJMPE(2021)·2 citations
  5. 05

    [Submitted on 15 Aug 2018] (cross-list from hep-ph)

    Multiplicity dependence of light nuclei production at LHC energies in the canonical statistical model

    Volodymyr Vovchenko🇩🇪 · Benjamin Donigus🇩🇪 · Horst Stoecker🇩🇪

    The statistical model with exact conservation of baryon number, electric charge, and strangeness - the Canonical Statistical Model (CSM) - is used to analyze the dependence of yields of light nuclei at midrapidity on charged pion multiplicity at the LHC. The CSM calculations are performed assuming baryon-symmetric matter, using the recently developed Thermal-FIST package. The light nuclei-to-proton yield ratios show a monotonic increase with charged pion multiplicity, with a saturation at the corresponding grand-canonical values in the high-multiplicity limit, in good qualitative agreement with the experimental data measured by the ALICE collaboration in pp and Pb-Pb collisions at different centralities and energies. Comparison with experimental data at low multiplicities shows that exact conservation of charges across more than one unit of rapidity and/or a chemical freeze-out temperature which decreases with the charged pion multiplicity improves agreement with the data.

    Comments:
    5 pages, 1 figure
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1808.05245 [pdf]
    PLB(2018)·105 citations
  6. 06

    [Submitted on 15 Aug 2018] (cross-list from hep-ph)

    Bayesian extraction of jet energy loss distributions in heavy-ion collisions

    Yayun He (CCNU, LBNL)🇨🇳 · Long-Gang Pang (LBNL, UCB)🇺🇸 · Xin-Nian Wang (CCNU, LBNL)🇨🇳

    Based on the factorization in perturbative QCD, a jet cross sections in heavy-ion collisions can be expressed as a convolution of the jet cross section in collisions and a jet energy loss distribution. Using this simple expression and the Markov Chain Monte Carlo method, we carry out Bayesian analyses of experimental data on jet spectra to extract energy loss distributions for both single inclusive and -triggered jets in collisions with different centralities at two colliding energies at the Large Hadron Collider. The average jet energy loss has a dependence on the initial jet energy that is slightly stronger than a logarithmic form and decreases from central to peripheral collisions. The extracted jet energy loss distributions with a scaling behavior in have a large width. These are consistent with the linear Boltzmann transport model simulations, in which the observed jet quenching is caused on the average by only a few out-of-cone scatterings.

    Comments:
    5 pages in RevTex, 3 figures, final version to appear in Phys. Rev. Letters
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1808.05310 [pdf]
    PRL(2019)·62 citations

Affiliations

first authorsco-authorsvia INSPIRE