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Nuclear Theory·nucl-th

Monday·October 21, 2019

7 papers—6 primary·1 cross-listed

All7Primary6Cross-lists1
  1. 01

    [Submitted on 17 Oct 2019]

    Baryon preclustering at the freeze-out of heavy-ion collisions and light-nuclei production

    Edward Shuryak🇺🇸 · Juan M. Torres-Rincon🇺🇸

    Following the idea of nucleon clustering and light-nuclei production in relativistic heavy-ion collisions close to the QCD critical-end point, we address the quantum effects affecting the interaction of several nucleons at finite temperature. For this aim we use the -harmonics method to four-nucleon states ( particle), and also develop a novel semiclassical "flucton" method at finite temperature, based on certain classical paths in Euclidean time, and apply it to two- and four-particle configurations. To study possible effects on the light-nuclei production close to the QCD critical point, we also made such calculations with modified internuclear potentials. For heavy-ion experiments, we propose new measurements of light-nuclei multiplicity ratios which may show enhancements due to baryon preclustering. We point out the special role of the four-nucleon excitations of -particle, feeding into the final multiplicities of , He and He, and propose to directly look for their two-body decays.

    Comments:
    20 pages, 16 figures, typos fixed, small corrections and clarifications added, quality of some plots improved, references added. Version accepted for publication by the Physical Review C journal
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1910.08119 [pdf]
    PRC(2020)·53 citations
  2. 02

    [Submitted on 17 Oct 2019]

    Electroweak properties of kaons in a nuclear medium

    Parada T. P. Hutauruk🇰🇷 · K. Tsushima🇰🇷

    Kaon electroweak properties in symmetric nuclear matter are studied in the Nambu--Jona-Lasinio model using the proper-time regularization. The valence quark properties in symmetric nuclear matter are calculated in the quark-meson coupling model, and they are used as inputs for studying the in-medium kaon properties in the NJL model. We evaluate the kaon decay constant, kaon-quark coupling constant, and electromagnetic form factor by two different approaches. Namely, by two different ways of calculating the in-medium constituent quark masses of the light quarks. We predict that, in both approaches, the kaon decay constant and kaon-quark coupling constant decrease as nuclear density increases, while the charge radius increases by 20-25\% at normal nuclear density.

    Comments:
    13 pages, 9 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1910.08133 [pdf]
    12 citations
  3. 03

    [Submitted on 18 Oct 2019]

    Probe the tilted Quark-Gluon Plasma with charmonium directed flow

    Baoyi Chen · Maoxin Hu · Huanyu Zhang · Jiaxing Zhao🇨🇳

    Charmonium directed flows are studied based on transport model coupled with the realistic three dimensional expansions of the bulk medium. The non-central symmetric nucleus-nucleus collisions can generate the rotating quark-gluon plasma (QGP) with symmetry-breaking longitudinal distributions. In GeV Au-Au semi-central collisions, charmonium are primordially produced in the initial hard process, they are mainly dissociated by the initial tilted source with high temperatures and then move out of the bulk medium to keep the early information of the medium. Charmonia are less affected by the hydrodynamic expansions of QGP where its tilted shape is being diluted. This biased dissociation can generate directed flows of and which are much larger than the values of light charged hadrons and open heavy flavor. They are sensitive and clean to the effect of QGP rapidity-odd initial energy densities.

    Comments:
    5 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1910.08275 [pdf]
    PLB(2020)·27 citations
  4. 04

    [Submitted on 18 Oct 2019]

    HALL POST INEQUALITIES: review and application to molecules and tetraquarks

    Jean-Marc Richard🇫🇷 · Alfredo Valcarce🇪🇸 · Javier Vijande🇪🇸

    A review is presented of the Hall-Post inequalities that give lower-bounds to the ground-state energy of quantum systems in terms of energies of smaller systems. New applications are given for systems experiencing both a static source and inner interactions, as well as for hydrogen-like molecules and for tetraquarks in some quark models. In the latter case, the Hall-Post inequalities constrain the possibility of deeply-bound exotic mesons below the threshold for dissociation into two quark-antiquark mesons. We also emphasize the usefulness of the Hall-Post bounds in terms of 3-body energies when some 2-body subsystems are ill defined or do not support any bound state.

    Comments:
    44 pages, 15 figures, to appear in Annals of Physics
    Subjects:
    Nuclear Theory (nucl-th); Quantum Gases (cond-mat.quant-gas); High Energy Physics — Phenomenology (hep-ph); physics.atm-clus (physics.atm-clus)
    arXiv:
    1910.08295 [pdf]
    Annals Phys.(2020)·23 citations
  5. 05

    [Submitted on 18 Oct 2019]

    Evaluation of pion-nucleon sigma term in Dyson-Schwinger equation approach of QCD

    Jing-Hui Huang🇨🇳 · Ting-Ting Sun🇨🇳 · Huan Chen🇨🇳

    We calculate the variation of the chiral condensate in medium with respect to the quark chemical potential and evaluate the pion-nucleon sigma term via the Hellmann-Feynman theorem. The variation of chiral condensate in medium are obtained by solving the truncated Dyson-Schwinger equation for quark propagator at finite chemical potential, with different models for the quark-gluon vertex and gluon propagator. We obtain the value of the sigma term = 62(1)(2) MeV, where the first represents the systematic error due to our different model for the quark-gluon vertex and gluon propagator and the second represents a statistical error in our linear fitting procedure.

    Comments:
    7 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1910.08298 [pdf]
    PRD(2020)·15 citations
  6. 06

    [Submitted on 18 Oct 2019]

    Supersolidity of the cluster structure in the nucleus C

    S. Ohkubo · J. Takahashi · Y. Yamanaka

    For more than half a century, the structure of C, such as the ground band, has been understood to be well described by the three cluster model based on a geometrical crystalline picture. On the contrary, recently it has been claimed that the ground state of C is also well described by a nonlocalized cluster model without any of the geometrical configurations originally proposed to explain the dilute gas-like Hoyle state, which is now considered to be a Bose-Einstein condensate of clusters. The challenging unsolved problem is how we can reconcile the two exclusive cluster pictures of C, crystalline vs nonlocalized structure. We show that the crystalline cluster picture and the nonlocalized cluster picture can be reconciled by noticing that they are a manifestation of supersolidity with properties of both crystallinity and superfluidity. This is achieved through a superfluid cluster model based on effective field theory, which treats the Nambu-Goldstone zero mode rigorously. For several decades, scientists have been searching for a supersolid in nature.Nuclear cluster structure is considered to be the first confirmed example of a stable supersolid.

    Comments:
    15 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th); cond-mat.other (cond-mat.other); Quantum Gases (cond-mat.quant-gas); Nuclear Experiment (nucl-ex)
    arXiv:
    1910.08400 [pdf]
    PTEP(2020)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE