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Nuclear Theory·nucl-th

Friday·April 9, 2021

7 papers—2 primary·5 cross-listed

All7Primary2Cross-lists5
  1. 03

    [Submitted on 7 Apr 2021] (cross-list from hep-ph)

    The Time-reversal Odd Side of a Jet

    Xiaohui Liu🇨🇳 · Hongxi Xing🇨🇳

    We re-examine the jet probes of the nucleon spin and flavor structures. We find for the first time the time-reversal odd (T-odd) component of a jet, conventionally thought to vanish, can survive due to the non-perturbative fragmentation and hadronization effects and could be testable. This additional contribution of a jet will lead to novel jet phenomena relevant for unlocking the access to several spin structures of the nucleon, which were thought to be impossible by using jets. As examples, we show how the T-odd constituent can couple to the proton transversity at the Electron Ion Collider (EIC) and can give rise to the anisotropy in the jet production in annihilations. We expect the T-odd contribution of the jet to have broad applications in high energy nuclear physics.

    Comments:
    5 pages, 4 figures. Update the figures and the references. Add a Pythia simulation of the T-odd jet production at the EIC. Clarify the universality, the predictive power and the advantage of using the jet probes to the nucleon spin information
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2104.03328 [pdf]
    Fund.Res.(2023)·19 citations
  2. 04

    [Submitted on 8 Apr 2021] (cross-list from hep-ph)

    Interacting quark matter effects on the structure of compact stars

    José C. Jiménez🇧🇷

    In this work, we study the effects that interacting quark matter has on the stellar structure of strange and charm quark stars. Additionally, their stability against radial pulsations is analyzed using a first-order formalism for adiabatic general relativistic oscillations. Besides, the early stage of stellar evolution of neutron stars after the supernovae explosion, i.e. protoneutron stars, is investigated by considering the possibility of a first-order phase transition to quark matter rich in leptons, where the dynamics of conversion between phases is studied within a thermal nucleation model. For each kind of compact star mentioned we use for the quark phase the equation of state calculated within cold perturbative QCD (pQCD), parametrized only by its renormalization scale. We note that the original pQCD framework is manipulated appropriately to include neutrinos and extended to add heavy quarks to the original system composed only by up, down and strange quark flavors.

    Comments:
    Ph.D. Thesis; 151 pages, 52 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2104.03551 [pdf]
    3 citations
  3. 05

    [Submitted on 8 Apr 2021] (cross-list from hep-ph)

    The deconvolution problem of deeply virtual Compton scattering

    V. Bertone🇫🇷 · H. Dutrieux🇫🇷 · C. Mezrag🇫🇷 · H. Moutarde🇫🇷 · P. Sznajder🇵🇱

    Generalised parton distributions are instrumental to study both the three-dimensional structure and the energy-momentum tensor of the nucleon, and motivate numerous experimental programmes involving hard exclusive measurements. Based on a next-to-leading order analysis and a careful study of evolution effects, we exhibit non-trivial generalised parton distributions with arbitrarily small imprints on deeply virtual Compton scattering observables. This means that in practice the reconstruction of generalised parton distributions from measurements, known as the deconvolution problem, does not possess a unique solution for this channel. In this Letter we discuss the consequences on the extraction of generalised parton distributions from data and advocate for a multi-channel analysis.

    Comments:
    7 pages, 2 figures
    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:
    2104.03836 [pdf]
    PRD(2021)·92 citations
  4. 06

    [Submitted on 7 Apr 2021] (cross-list from hep-ph)

    Kubo estimation of the electrical conductivity for a hot relativistic fluid in the presence of a magnetic field

    Sarthak Satapathy🇮🇳 · Snigdha Ghosh🇮🇳 · Sabyasachi Ghosh🇮🇳

    We have explored the multi-component structure of electrical conductivity of relativistic Fermionic and Bosonic fluid in presence of magnetic field by using Kubo approach. This is done by explicitly evaluating the thermo-magnetic vector current spectral functions using the real time formalism of finite temperature field theory and the Schwinger proper time formalism. In absence of magnetic field, the one-loop diagramatic representation of Kubo expression of any transport coefficients is exactly same with relaxation time approximation (RTA) based expression, but this equality does not hold for finite magnetic field picture due to lacking of proper implementation of quantum effect in latter approach. We have shown this discrepancy for particular transport coefficient - electrical conductivity, whose starting point in Kubo approach will be electromagnetic current-current correlator and its one-loop skeleton diagram carrying two scalar/Dirac propagators for scalar/Dirac fluid. Through a numerical comparison between RTA and Kubo expressions of conductivity components (parallel and perpendicular), we have attempted to interpret detail quantum field theoretical effect, contained by Kubo expression but not by RTA expression. In classical RTA expression we get magnetic field independent parallel conductivity due to zero Lorentz force but in field theoretical Kubo expression, it decreases and increases with the magnetic field for scalar and Dirac medium respectively due to Landau quantization effect. This parallel component of conductivity can be interpreted as zero momentum limit of quantum fluctuation with same Landau level internal lines. While for perpendicular component of conductivity, fluctuation with Landau level differences are noticed, which might be a new realization of transportation in field theoretical sector.

    Comments:
    Version published in Physical Review D
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Nuclear Theory (nucl-th)
    arXiv:
    2104.03917 [pdf]
    PRD(2021)·35 citations
  5. 07

    [Submitted on 8 Apr 2021] (cross-list from quant-ph)

    Energy-independent optical potential from Marchenko equation

    N. A. Khokhlov🇷🇺 · L. I. Studenikina🇷🇺

    We present a new algebraic method for solving the inverse problem of quantum scattering theory based on the Marchenko theory. We applied a triangular wave set for the Marchenko equation kernel expansion in a separable form. The separable form allows a reduction of the Marchenko equation to a system of linear equations. For the zero orbital angular momentum, a linear expression of the kernel expansion coefficients is obtained in terms of the Fourier series coefficients of a function depending on the momentum and determined by the scattering data in the finite range of . It is shown that a Fourier series on a finite momentum range () of a function ( is the scattering matrix) defines the potential function of the corresponding radial Schrödinger equation with -step accuracy. A numerical algorithm is developed for the reconstruction of the optical potential from scattering data. The developed procedure is applied to analyze the data up to 3 GeV. It is shown that these data are described by optical energy-independent partial potential.

    Comments:
    6 pages, 4 figures. arXiv admin note: text overlap with arXiv:2102.01464
    Subjects:
    Quantum Physics (quant-ph); Nuclear Theory (nucl-th)
    arXiv:
    2104.03939 [pdf]
    PRC(2021)·7 citations

Affiliations

first authorsco-authorsvia INSPIRE