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Nuclear Theory·nucl-th

Monday·July 31, 2023

10 papers—6 primary·4 cross-listed

All10Primary6Cross-lists4
  1. 07

    [Submitted on 27 Jul 2023] (cross-list from hep-ph)

    Seeing Beauty in the Quark-Gluon Plasma with Energy Correlators

    Carlota Andres🇫🇷 · Fabio Dominguez🇪🇸 · Jack Holguin🇫🇷 · Cyrille Marquet🇫🇷 · Ian Moult🇺🇸

    Heavy quarks created in heavy-ion collisions serve as an excellent probe of the produced quark-gluon plasma (QGP). The radiation pattern of jets formed from heavy quarks as they traverse the QGP exhibits a particularly interesting structure due to the interplay of two competing effects: the suppression of small-angle radiation, also known as the ``dead-cone'' effect, and the enhancement of emitted gluons by medium-induced radiation. In this Letter, we propose a new observable, based on the energy correlator approach to jet substructure, which will allow us to disentangle the two scales associated to these two phenomena and to determine under which conditions the dead-cone is filled by medium-induced radiation. Combined with the forthcoming high-statistics measurements of heavy-flavor jets, this work provides a novel tool to unravel the dynamics of the QGP.

    Comments:
    v1: 5 pages, 4 lovely figures, v2: published in PRD, 1 additional appendix with a beautiful figure
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2307.15110 [pdf]
    PRD(2024)·60 citations
  2. 08

    [Submitted on 28 Jul 2023] (cross-list from hep-ph)

    Axial anomaly effect on three-quark and five-quark singly heavy baryons

    Hiroto Takada🇯🇵 · Daiki Suenaga🇯🇵 · Masayasu Harada🇯🇵 · Atsushi Hosaka🇯🇵 · Makoto Oka🇯🇵

    Effects of the axial anomaly on the mass spectrum of singly heavy baryons (SHBs) is studied in terms of the chiral effective theory based on the chiral linear representation for light flavors. We consider SHBs made of both three quarks () and five quarks (). For the three-quark SHBs we prove that the inverse mass hierarchy for the negative-parity and is realized only when the anomaly is present. For the five-quark SHBs, in contrast, it is found that the anomaly does not change the mass spectrum at the leading order, and accordingly their decay properties induced by emitting a pseudoscalar meson are not affected by the anomaly. Moreover, taking into account small mixings between the three-quark and five-quark SHBs, we find that the observed excited state, either or , can be consistently regarded as a negative-parity SHB that is dominated by the five-quark component. We also predict a new negative-parity five-quark dominant , whose mass is around MeV and the decay width is of order a few MeV, which provides useful information for future experiments to check our description.

    Comments:
    15 pages, 10 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2307.15304 [pdf]
    PRD(2023)·4 citations
  3. 09

    [Submitted on 28 Jul 2023] (cross-list from hep-ph)

    Momentum distribution of charm hadrons in a fluid-dynamic approach

    Federica Capellino🇩🇪 · Andrea Dubla🇩🇪 · Stefan Floerchinger🇩🇪 · Eduardo Grossi🇮🇹 · Andreas Kirchner🇩🇪 · Silvia Masciocchi🇩🇪

    Exploiting a mapping between transport theory and fluid dynamics, we show how a fluid-dynamic description of the diffusion of charm quarks in the QCD plasma is feasible. We show results for spectra of charmed hadrons obtained with a fluid-dynamic description of the quark-gluon plasma (QGP) coupled with the conservation of a heavy-quark - antiquark current. We compare our calculations with the most recent experimental data in order to provide further constraints on the transport coefficients of the QGP.

    Comments:
    Hard Probes 2023
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2307.15580 [pdf]
    1 citation
  4. 10

    [Submitted on 28 Jul 2023] (cross-list from hep-ph)

    Unconventional mechanisms of heavy quark fragmentation

    B. Z. Kopeliovich🇨🇱 · J. Nemchik🇨🇿 · I. K. Potashnikova🇨🇱 · Ivan Schmidt🇨🇱

    Heavy and light quarks produced in high- partonic collisions radiate differently. Heavy quarks regenerate their color field, stripped-off in the hard reaction, much faster than the light ones and radiate a significantly smaller fraction of the initial quark energy. This peculiar feature of heavy-quark jets leads to a specific shape of the fragmentation functions observed in annihilation. Differently from light flavors, the heavy quark fragmentation function strongly peaks at large fractional momentum , i.e. the produced heavy-light mesons, or , carry the main fraction of the jet momentum. This is a clear evidence of the dead-cone effect, and of a short production time of a heavy-light mesons. Contrary to propagation of a small dipole, which survives in the medium due to color transparency, a heavy-light dipole promptly expands to a large size. Such a big dipole has no chance to remain intact in a dense medium produced in relativistic heavy ion collisions. On the other hand, a breakup of such a dipole does not affect much the production rate of mesons, differently from the case of light meson production.

    Comments:
    9 pages, submitted to UNIVERCE (MDPI)
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2307.15687 [pdf]
    Universe(2023)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE