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Nuclear Theory·nucl-th

Wednesday·February 17, 2021

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 05

    [Submitted on 15 Feb 2021] (cross-list from hep-ph)

    Proton mass decomposition: naturalness and interpretations

    Xiangdong Ji🇺🇸

    I discuss the scope and naturalness of the proton mass decomposition (or sum rule) published in PRL74, 1071 (1995) and answer a few criticisms that appeared recently in the literature, focusing particularly on its interpretation and the quantum anomalous energy contribution. I comment on the so-called frame-independent or invariant-mass decomposition from the trace of the energy-momentum tensor. I stress the importance of measuring the quantum anomalous energy through experiments. Finally, I point out a large discrepancy in the scalar radius of the nucleon extracted from vector-meson productions and lattice QCD calculations.

    Comments:
    Updated with mass radius discussions, 10 pages, no figure
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2102.07830 [pdf]
    Front.Phys.(Beijing)(2021)·104 citations
  2. 06

    [Submitted on 16 Feb 2021] (cross-list from hep-ph)

    Rapidity dependence of heavy-flavour production in heavy-ion collisions within a full 3+1 transport approach: quenching, elliptic and directed flow

    Andrea Beraudo🇮🇹 · Arturo De Pace🇮🇹 · Marco Monteno🇮🇹 · Marzia Nardi🇮🇹 · Francesco Prino🇮🇹

    We extend our POWLANG transport setup for the modelling of heavy-flavour production in heavy-ion collisions to the case of full 3+1 simulations, dropping the approximation of longitudinal boost-invariance of the background medium. This enables us to provide predictions for observables for which the rapidity dependence is essential in order to obtain a non-vanishing signal, like the directed flow , and to get reliable results also for kinematic distributions of heavy-flavour particles at forward rapidity. We compare our predictions with experimental data obtained in Au-Au and Pb-Pb collisions at RHIC and at the LHC.

    Comments:
    Revised version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2102.08064 [pdf]
    JHEP(2021)·32 citations
  3. 07

    [Submitted on 16 Feb 2021] (cross-list from hep-ph)

    Diffusion coefficient matrix of the strongly interacting quark-gluon plasma

    Jan A. Fotakis🇩🇪 · Olga Soloveva🇩🇪 · Carsten Greiner🇩🇪 · Olaf Kaczmarek🇩🇪 · Elena Bratkovskaya🇩🇪

    We study the diffusion properties of the strongly interacting quark-gluon plasma (sQGP) and evaluate the diffusion coefficient matrix for the baryon (), strange () and electric () charges - () and show their dependence on temperature and baryon chemical potential . The non-perturbative nature of the sQGP is evaluated within the Dynamical Quasi-Particle Model (DQPM) which is matched to reproduce the equation of state of the partonic matter above the deconfinement temperature from lattice QCD. The calculation of diffusion coefficients is based on two methods: i) the Chapman-Enskog method for the linearized Boltzmann equation, which allows to explore non-equilibrium corrections for the phase-space distribution function in leading order of the Knudsen numbers as well as ii) the relaxation time approximation (RTA). In this work we explore the differences between the two methods. We find a good agreement with the available lattice QCD data in case of the electric charge diffusion coefficient (or electric conductivity) at vanishing baryon chemical potential as well as a qualitative agreement with the recent predictions from the holographic approach for all diagonal components of the diffusion coefficient matrix. The knowledge of the diffusion coefficient matrix is also of special interest for more accurate hydrodynamic simulations.

    Comments:
    16 pages, 10 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2102.08140 [pdf]
    PRD(2021)·37 citations
  4. 08

    [Submitted on 16 Feb 2021] (cross-list from nucl-ex)

    EIC Physics from An All-Silicon Tracking Detector

    John Arrington🇺🇸 · Reynier Cruz-Torres🇺🇸 · Winston DeGraw🇺🇸 · Xin Dong🇺🇸 · Leo Greiner🇺🇸 · Samuel Heppelmann🇺🇸 · Barbara Jacak🇺🇸 · Yuanjing Ji🇺🇸 · Matthew Kelsey🇺🇸 · Spencer R. Klein🇺🇸 · Yue Shi Lai🇺🇸 · Grazyna Odyniec🇺🇸 and 8 other authors

    The proposed electron-ion collider has a rich physics program to study the internal structure of protons and heavy nuclei. This program will impose strict requirements on detector design. This paper explores how these requirements can be satisfied using an all-silicon tracking detector, by consideration of three representative probes: heavy flavor hadrons, jets, and exclusive vector mesons.

    Comments:
    48 pages, 55 figures
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2102.08337 [pdf]
    22 citations

Affiliations

first authorsco-authorsvia INSPIRE