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Nuclear Theory·nucl-th

Friday·April 23, 2021

9 papers—3 primary·6 cross-listed

All9Primary3Cross-lists6
  1. 01

    [Submitted on 22 Apr 2021]

    Prerequisites for heavy quark coalescence in heavy-ion collisions

    Taesoo Song🇩🇪 · Gabriele Coci🇩🇪

    The coalescence model assumes instant formation of a bound state from unbound particles based on the overlapping of two states in spatial and momentum spaces and quantum numbers. Therefore, applied to the hadronization of partons, it provides a snapshot of a Quark-Gluon Plasma (QGP) just before hadronization. We use the coalescence model for the formation of the ground state of open heavy flavor and the statistical model for heavier states. Assuming that all heavy flavors in thermal equilibrium hadronize through the coalescence, we find that the QGP just before hadronization is not composed of completely randomized partons but must have strong correlations in color charges as well as in momentum and/or coordinate spaces between heavy quark and light (anti-)quark.

    Comments:
    8 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2104.10987 [pdf]
    NPA(2022)·11 citations
  2. 02

    [Submitted on 22 Apr 2021]

    Electric dipole polarizability of neutron rich nuclei

    J. Piekarewicz🇺🇸

    Insights into the equation of state of neutron rich matter obtained from the neutron skin thickness of 208Pb are in sharp conflict with earlier measurements of the electric dipole polarizability. We use a set of accurately calibrated energy density functionals to highlight the tension and to articulate how plans for a highly-intense Gamma Factory may alleviate the tension.

    Comments:
    11 pages and 3 figures. Submitted to Annals of Physics as a contribution to the Special Issue on Physics Opportunities with the Gamma Factory
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2104.11013 [pdf]
    Annalen Phys.(2022)·1 citation
  3. 03

    [Submitted on 22 Apr 2021]

    Color Transparency and the Proton Form Factor- Feynman Wins

    Olivia Caplow-Munro🇺🇸 · Gerald A. Miller🇺🇸

    A recent experiment [{\bf Phys. Rev. Lett. 126,082301 (2021)}] used the reaction on C to search for the effects of color transparency (the absence of final state interactions). Color transparency was said to be ruled out. The ability to observe the effects of color transparency depends on the ability of a putative point-like-configuration (PLC), formed in a high-momentum transfer coherent reaction, to escape the nucleus without expanding its size. We study the expansion aspect of color transparency using superconformal baryon-meson symmetry and light-front holographic QCD. A new formalism is obtained and used to analyze the recent experiment. The resulting conclusion is that effects of expansion would not be sufficiently significant in causing final state interactions to occur. Therefore we conclude that a PLC was not formed. This means that the Feynman mechanism involving virtual photon absorption on a single high momentum quark is responsible for high momentum electromagnetic form factor of the proton.

    Comments:
    10 pages,4 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2104.11168 [pdf]
    PRC(2021)·17 citations

Affiliations

first authorsco-authorsvia INSPIRE