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Nuclear Theory·nucl-th

Monday·February 24, 2020

4 papers—1 primary·3 cross-listed

All4Primary1Cross-lists3
  1. 01

    [Submitted on 21 Feb 2020]

    Energy-loss of heavy quarks in the isotropic collisional hot QCD medium at a finite chemical potential

    M. Yousuf Jamal🇮🇳 · Bedangadas Mohanty🇮🇳

    The present article is the followup of {\color{blue} Eur.\ Phys.\ J.\ C {\bf 79}, 761 (2019)}, where we have studied the energy-loss of the heavy quarks traversing through the isotropic collisional hot QCD medium. Since, the exploration of QCD phase diagram is possible with the upcoming experimental facilities such as Anti-proton and Ion Research (FAIR) and Nuclotron-based Ion Collider fAcility (NICA), at finite baryon density and moderate temperature, the inclusion of finite chemical potential is essential to study the hot QCD/QGP medium. Therefore, the aim is to develop a formalism to study the energy-loss of heavy quarks moving in the interacting collisional hot QCD medium having small but a finite quark chemical potential. To do so, the extended effective fugacity quasi-particle model has been employed \cite{chandra_quasi1, chandra_quasi2, Mitra:2017sjo} while considering the effective kinetic theory approach using the Bhatnagar-Gross-Krook (BGK) collisional kernel. Finally, the momentum dependence of the energy-loss for the charm and bottom quark has been investigated at different values of collisions frequency and chemical potential. It is observed that as compared to charm quark, bottom quark loses less energy at a particular momentum, collisional frequency and chemical potential. Also, the energy-loss is seen to decrease with increasing chemical potential.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Theory (hep-th)
    arXiv:
    2002.09230 [pdf]
    Eur.Phys.J.Plus(2021)·15 citations
  2. 02

    [Submitted on 21 Feb 2020] (cross-list from nucl-ex)

    Strangeness in Nuclei and Neutron Stars

    Laura Tolos🇩🇪 · Laura Fabbietti🇩🇪

    We review the present status of the experimental and theoretical developments in the field of strangeness in nuclei and neutron stars. We start by discussing the interaction, that is governed by the presence of the . We continue by showing the two-pole nature of the , and the production mechanisms in photon-, pion-, kaon-induced reactions as well as proton-proton collisions, while discussing the formation of bound states. We then move to the theoretical and experimental analysis of the properties of kaons and antikaons in dense nuclear matter, paying a special attention to kaonic atoms and the analysis of strangeness creation and propagation in nuclear collisions. Next, we examine the meson and the advances in photoproduction, proton-induced and pion-induced reactions, so as to understand its properties in dense matter. Finally, we address the dynamics of hyperons with nucleons and nuclear matter, and the connection to the phases of dense matter with strangeness in the interior of neutron stars.

    Comments:
    103 pages, 53 figures, 3 tables, invited review to appear in Progress in Particle and Nuclear Physics
    Subjects:
    Nuclear Experiment (nucl-ex); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2002.09223 [pdf]
    PPNP(2020)·306 citations
  3. 03

    [Submitted on 21 Feb 2020] (cross-list from nucl-ex)

    Quasi- band in Te

    Prithwijita Ray · H. Pai · Sajad Ali · Anjali Mukherjee · A. Goswami · S. Rajbanshi · S. Chakraborty · G. Gangopadhyay · Md. S. R. Laskar · R. Palit · G. H. Bhat · S. Jehangir and 7 other authors

    The low-lying non-yrast states in Te have been investigated using the Indian National Gamma Array through the fusion-evaporation reaction Sn(He, 2n) at a beam energy of 37 MeV. Eight new -transitions have been placed in the level scheme to establish the quasi- band in this nucleus. Spin and parity of several excited states have been assigned from the present spectroscopy measurements. The comparison of experimental results on the observed bands with the Interacting Boson Model (IBM) and Triaxial Projected Shell Model (TPSM) confirming the existence of the quasi- band structure in the Te nucleus.

    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2002.09265 [pdf]
    PRC(2020)·13 citations
  4. 04

    [Submitted on 21 Feb 2020] (cross-list from nucl-ex)

    Search for CME in U+U and Au+Au collisions in STAR with different approaches of handling backgrounds

    Jie Zhao (for the STAR collaboration)🇺🇸

    The chiral magnetic effect (CME) refers to charge separation along a strong magnetic field between left- and right-handed quarks, caused by interactions with topological gluon fields from QCD vacuum fluctuations. We present two approaches to handle the dominant elliptic flow () background in the three-particle correlator (), sensitive to CME. In the first approach, we present the and measurements in U+U and Au+Au collisions. While hydrodynamic simulations including resonance decays and local charge conservation predict that scaled by will be similar in U+U and Au+Au collisions, the projected B-field exhibits a distinct difference between the two systems and with varying . Therefore, U+U and Au+Au collisions provide configurations with different expectations for both CME signal and background. Moreover, the three-particle observable scaled by provide baseline measurement for only the background. In the second approach, we handle the background by measuring with respect to the planes of spectators measured by Zero Degree Calorimeters and participants measured by Time Projection Chamber. These measurements contain different amounts of contributions from CME signal (along B-field, due to spectators) and background (determined by the participant geometry). With the two measurements, the possible CME signal and the background contribution can be determined. We report such a measurement in Au+Au collisions at 27 GeV with the newly installed event plane detector, and report the new findings in U+U system where the spectator-participant plane correlations are expected to differ from those in Au+Au collisions.

    Comments:
    4 pages, 4 figures, Quark Matter 2019
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2002.09410 [pdf]
    NPA(2021)·11 citations

Affiliations

first authorsco-authorsvia INSPIRE