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Nuclear Theory·nucl-th

Tuesday·January 4, 2022

9 papers—6 primary·3 cross-listed

All9Primary6Cross-lists3
  1. 07

    [Submitted on 1 Jan 2022] (cross-list from hep-ph)

    Possible early universe signals in proton collisions at the Large Hadron Collider

    Raghunath Sahoo🇮🇳 · Tapan Kumar Nayak🇨🇭

    Our universe was born about 13.8 billion years ago from an extremely hot and dense singular point, in a process known as the Big Bang. The hot and dense matter which dominated the system within a few microseconds of its birth was in the form of a soup of elementary quarks and gluons, known as the quark-gluon plasma (QGP). Signatures compatible with the formation of the QGP matter have experimentally been observed in heavy-ion (such as Au or Pb) collisions at ultra-relativistic energies. Recently, experimental data of proton-proton (pp) collisions at the CERN Large Hadron Collider (LHC) have also shown signals resembling those of the QGP formation, which made these studies quite stimulating as to how the collision of small systems features in producing the early universe signals. In this article, we report on some of the compelling experimental results and give an account of the present understanding. We review the pp physics program at the LHC and discuss future prospects in the context of exploring the nature of the primordial matter in the early universe.

    Comments:
    7 pages and 7 figures, written for general multi-disciplinary readers, Published version in Current Science
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Theory (hep-th); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2201.00202 [pdf]
    Curr.Sci.(2021)·22 citations
  2. 08

    [Submitted on 2 Jan 2022] (cross-list from hep-ph)

    Chiral Dynamics: Theory and Experiment -- A Tribute to Aron Bernstein

    Ulf-G. Meißner🇩🇪

    I review and discuss the contributions of Aron Bernstein to the field of chiral dynamics.

    Comments:
    16 pages, 7 figures, 1 table, opening talk 10th Workshop on Chiral Dynamics - Theory and Experiment (CD2021), Beijing, September 2021 (online)
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2201.00341 [pdf]
    PoS(2024)·2 citations
  3. 09

    [Submitted on 3 Jan 2022] (cross-list from hep-ph)

    Analysis on the composite nature of the light scalar mesons and

    Ze-Qiang Wang🇨🇳 · Xian-Wei Kang🇨🇳 · J. A. Oller🇪🇸 · Lu Zhang🇨🇳

    We study the weight or compositeness of the - and - in the composition of the and resonances, respectively. Either we use the saturation of the total width and compositeness, or we use a Flatté parameterization taking also into account the spectral function of a near-threshold resonance. We make connections and compare between these two methods. We take input values for the pole mass and width from several determinations in the literature. In addition, we take as third input either the total compositeness or the decay-width branching ratio to the lighter channel for each resonance. It turns out that for the poles considered the meson-meson components are dominant for the , while for the resonance they are subdominant. We also provide partial decay widths and partial compositeness coefficients, so that the component is the most important one for the . Additionally, this study stresses the need to distinguish between the bare and dressed couplings and widths in a Flatté parameterization. We elaborate on the connection between the partial-decay widths calculated in terms of the dressed couplings and the actual measured ones. Due to the coupled-channel dynamics when the pole lies near the heavier threshold in the second Riemann sheet some changes are needed with respect to standard relations.

    Comments:
    42 pages, 16 tables, 2 figures, final version, will be published in Phys. Rev. D
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    2201.00492 [pdf]
    PRD(2022)·29 citations

Affiliations

first authorsco-authorsvia INSPIRE