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Nuclear Theory·nucl-th

Monday·May 25, 2020

7 papers—2 primary·5 cross-listed

All7Primary2Cross-lists5
  1. 03

    [Submitted on 21 May 2020] (cross-list from hep-ph)

    Exploring production mechanism at the future Electron-Ion Collider

    Jian-Wei Qiu🇺🇸 · Xiang-Peng Wang🇺🇸 · Hongxi Xing🇨🇳

    We propose to use transverse momentum distribution of production at the future Electron Ion Collider (EIC) to explore the production mechanism of heavy quarkonia in high energy collisions. We apply QCD and QED collinear factorization to the production of a pair at high , and non-relativistic QCD factorization to the hadronization of the pair to a . We evaluate -distribution at both leading and next-to-leading order in strong coupling, and show that production rates for various color-spin channels of a pair in electron-hadron collisions are very different from that in hadron-hadron collisions, which provides a strong discriminative power to determine various transition rates for the pair to become a . We predict that the produced in electron-hadron collisions is likely unpolarized, and the production is an ideal probe for gluon distribution of colliding hadron (or nucleus). We find that the production is dominated by the color-octet channel, providing an excellent probe to explore the gluon medium in large nuclei at the EIC.

    Comments:
    6 pages, 6 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2005.10832 [pdf]
    Chin.Phys.Lett.(2021)·21 citations
  2. 04

    [Submitted on 21 May 2020] (cross-list from hep-th)

    BPS Skyrme neutron stars in generalized gravity

    C. Adam🇪🇸 · M. Huidobro🇪🇸 · R. Vazquez🇪🇸 · A. Wereszczynski🇵🇱

    We study the coupling of nuclear matter described by the BPS Skyrme model to generalized gravity. Concretely, we consider the Starobinsky model which provides the leading-order correction to the Einstein-Hilbert action. Static solutions describing neutron stars are found both for the full field theory and for the mean-field approximation. We always consider the full Starobinsky model in the nonperturbative approach, using appropriately generalized shooting methods for the numerical neutron star calculations. Many of our results are similar to previous investigations of neutron stars for the Starobinsky model using other models of nuclear matter, but there are some surprizing discrepancies. The "Newtonian mass" relevant for the surface redshift, e.g., results larger than the ADM mass in our model, in contrast to other investigations. This difference is related to the particularly high stiffness of nuclear matter described by the BPS Skyrme model and offers an interesting possibility to distinguish different models of nuclear matter within generalized gravity.

    Comments:
    LaTex, 28 pages, 13 figures; v2: minor changes
    Subjects:
    High Energy Physics — Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    2005.10834 [pdf]
    JCAP(2020)·2 citations
  3. 05

    [Submitted on 22 May 2020] (cross-list from hep-ph)

    Model comparison for initial density fluctuations in high energy heavy ion collisions

    Stefan Floerchinger🇩🇪 · Eduardo Grossi🇺🇸 · Kianusch Vahid Yousefnia🇩🇪

    Four models for the initial conditions of a fluid dynamic description of high energy heavy ion collisions are analysed and compared. We study expectation values and event-by-event fluctuations in the initial transverse energy density profiles from Pb-Pb collisions. Specifically, introducing a Fourier-Bessel mode expansion for fluctuations, we determine expectation values and two-mode correlation functions of the expansion coefficients. The analytically solveable independent point-sources model is compared to an initial state model based on Glauber theory and two models based on the Color Glass Condensate framework. We find that the large wavelength modes of all investigated models show universal properties for central collisions and also discuss to which extent general properties of initial conditions can be understood analytically.

    Comments:
    18 pages, 8 figures, results are attached as ancillary files; presentation in section IV rephrased for clarification, typos corrected, references added
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2005.11284 [pdf]
    PRC(2020)·7 citations
  4. 06

    [Submitted on 22 May 2020] (cross-list from hep-th)

    Analytic SU(N) Skyrmions at finite Baryon density

    Pedro D. Alvarez🇨🇱 · Sergio L. Cacciatori🇮🇹 · Fabrizio Canfora🇨🇱 · Bianca L. Cerchiai🇮🇹

    We construct analytic (3+1)-dimensional Skyrmions living at finite Baryon density in the SU(N) Skyrme model that are not trivial embeddings of SU(2) into SU(N). We used Euler angles decomposition for arbitrary N and the generalized hedgehog Ansatz at finite Baryon density. The Skyrmions of high topological charge that we find represent smooth Baryonic layers whose properties can be computed explicitly. In particular, we determine the energy to Baryon charge ratio for any N showing the smoothness of the large N limit. The closeness to the BPS bound of these configurations can also be analyzed. The energy density profiles of these finite density Skyrmions have \textit{lasagna-like} shape in agreement with recent experimental findings. The shear modulus can be precisely estimated as well and our analytical result is close to recent numerical studies in the literature.

    Comments:
    36 pages, REVTeX, accepted for publication in Phys. Rev. D, added some references
    Subjects:
    High Energy Physics — Theory (hep-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2005.11301 [pdf]
    PRD(2020)·29 citations
  5. 07

    [Submitted on 22 May 2020] (cross-list from hep-ph)

    On the connection between quark propagation and hadronization

    Alberto Accardi🇺🇸 · Andrea Signori🇮🇹

    We investigate the properties and structure of the recently discussed "fully inclusive jet correlator", namely, the gauge-invariant field correlator characterizing the final state hadrons produced by a free quark as this propagates in the vacuum. Working at the operator level, we connect this object to the single-hadron fragmentation correlator of a quark, and exploit a novel gauge invariant spectral decomposition technique to derive a complete set of momentum sum rules for quark fragmentation functions up to twist-3 level; known results are recovered, and new sum rules proposed. We then show how one can explicitly connect quark hadronization and dynamical quark mass generation by studying the inclusive jet's gauge-invariant mass term. This mass is, on the one hand, theoretically related to the integrated chiral-odd spectral function of the quark, and, on the other hand, is experimentally accessible through the and twist-3 fragmentation function sum rules. Thus, measurements of these fragmentation functions in deep inelastic processes provide one with an experimental gateway into the dynamical generation of mass in Quantum Chromodynamics.

    Comments:
    version accepted for publication in EPJ-C
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    2005.11310 [pdf]
    EPJC(2020)·23 citations

Affiliations

first authorsco-authorsvia INSPIRE