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Nuclear Theory·nucl-th

Friday·March 26, 2021

5 papers—1 primary·4 cross-listed

All5Primary1Cross-lists4
  1. 02

    [Submitted on 23 Dec 2020] (cross-list from hep-ph)

    Quark cluster expansion model for interpreting finite-T lattice QCD thermodynamics

    D. Blaschke🇵🇱 · Kirill A. Devyatyarov🇷🇺 · Olaf Kaczmarek🇩🇪

    We present a unified approach to the thermodynamics of hadron-quark-gluon matter at finite temperatures on the basis of a quark cluster expansion in the form of a generalized Beth-Uhlenbeck approach with a generic ansatz for the hadronic phase shifts that fulfills the Levinson theorem. The change in the composition of the system from a hadron resonance gas to a quark-gluon plasma takes place in the narrow temperature interval of MeV where the Mott dissociation of hadrons is triggered by the dropping quark mass as a result of the restoration of chiral symmetry. The deconfinement of quark and gluon degrees of freedom is regulated by the Polyakov loop variable that signals the breaking of the center symmetry of the color group of QCD. We suggest a Polyakov-loop quark-gluon plasma model with virial correction and solve the stationarity condition of the thermodynamic potential (gap equation) for the Polyakov loop. The resulting pressure is in excellent agreement with lattice QCD simulations up to high temperatures.

    Comments:
    LaTeX, 13 pages, 8 figures, Introduction and Subsect. 2.1. extended, references added
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2012.12894 [pdf]
    Symmetry(2021)·2 citations
  2. 03

    [Submitted on 24 Mar 2021] (cross-list from hep-ph)

    Enlighting the transverse structure of the proton via double parton scattering in photon-induced interactions

    Matteo Rinaldi🇫🇷 · Federico Alberto Ceccopieri🇮🇹

    In the present paper we address double parton scattering (DPS) in quasi-real photon-proton interactions. By using electromagnetic and hadronic models of the photon light cone wave functions, we compute the so-called effective cross-section, which allows us to calculate the DPS contribution to these processes under dedicated assumptions. In particular, for the four-jet photoproduction in HERA kinematics we found a sizeable DPS contribution. We show that if the photon virtuality could be measured and thus the dependence of on such a parameter exposed, information on the transverse distance between partons active in proton could be extracted. To this aim, we set lower limits on the integrated luminosity needed to observe such an effect which would allow the extraction of novel information on the proton structure.

    Comments:
    10 pages, 4 figures. Accepted version in Physical Review D letters. Added i) more details on the analyses presented ii) supplemental material iii) new calculations of the single parton scattering four jet photo-production cross-section
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2103.13480 [pdf]
    PRD(2022)·9 citations
  3. 04

    [Submitted on 25 Mar 2021] (cross-list from hep-ph)

    Quark-Gluon Plasma and Nucleons a la Laughlin

    Wei Lu🇺🇸

    Inspired by Laughlin's theory of the fractional quantum Hall effect, we explore the topological nature of the quark-gluon plasma and the nucleons in the context of the Clifford algebra. In our model, each quark is transformed into a composite particle via the simultaneous attachment of a spin monopole and an isospin monopole. This is induced by a novel kind of meson endowed with both spin and isospin degrees of freedom. The interactions in the strongly coupled quark-gluon system are governed by the topological winding number of the monopoles, which is an odd integer to ensure that the overall wave function is antisymmetric. The states of the quark-gluon plasma and the nucleons are thus uniquely determined by the combination of the monopole winding number m and the total quark number N. The radius squared of the quark-gluon plasma droplet is expected to be proportional to mN. We anticipate the observation of such proportionality in the heavy ion collision experiments.

    Comments:
    18 pages
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2103.13574 [pdf]
    Int.J.Geom.Meth.Mod.Phys.(2022)·1 citation
  4. 05

    [Submitted on 25 Mar 2021] (cross-list from hep-lat)

    Recent theoretical developments on QCD matter at finite temperature and density

    Sayantan Sharma🇮🇳

    QCD matter at finite temperature and density is a subject that has witnessed very impressive theoretical developments in the recent years. In this review I will discuss some new insights on the microscopic degrees of freedom of the QCD medium near the chiral crossover transition from lattice QCD. Latest high precision lattice data on the fluctuations and correlations between conserved charges like the baryon number, strangeness can help us to understand and distinguish between different models of interacting hadrons. Furthermore, the latest constraints on the location of the critical end-point and the curvature of the critical line will be discussed. In the later part of this review I will discuss about the insights on the thermal nature of the medium created in heavy ion collision experiments that have come from the theoretical analysis of the particle yields, and to what extent the lattice data on correlations and fluctuations of conserved charges can give us any information about the fireball at freezeout.

    Comments:
    Proceedings of the Plenary talk at XXIV DAE-BNRS High Energy Physics Symposium 2020 held at NISER, Bhubaneswar
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2103.13641 [pdf]
    IJMPE(2021)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE