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Nuclear Theory·nucl-th

Monday·April 26, 2021

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 04

    [Submitted on 23 Apr 2021] (cross-list from hep-ph)

    Dilepton production from magnetized quark matter with an anomalous magnetic moment of the quarks using a three-flavor PNJL model

    Nilanjan Chaudhuri🇮🇳 · Snigdha Ghosh🇮🇳 · Sourav Sarkar🇮🇳 · Pradip Roy🇮🇳

    Dilepton production from hot, dense and magnetized quark matter is studied using the three-flavor Polyakov loop extended Nambu--Jona-Lasinio (PNJL) model in which the anomalous magnetic moment (AMM) of the quarks is also taken into consideration. This is done by first evaluating the thermo-magnetic spectral function of the vector current correlator employing the real time formalism of finite temperature field theory and the Schwinger proper time formalism. The constituent quark mass which goes as an input in the expression of the dilepton production rate (DPR), has been calculated using the three-flavor PNJL model employing Pauli-Villiars (PV) regularization. The obtained constituent quark mass being strongly dependent on the temperature, density, magnetic field and AMM of the quarks, captures the effect of `strong' interactions specifically around the (pseudo) chiral and confinement-deconfinement phase transition regions. The analytic structure of the spectral function in the complex energy plane has been analyzed in detail and a non-trivial Landau cut is found in the physical kinematic domains resulting from the scattering of the Landau quantized quark/antiquark with the photon which is purely a finite magnetic field effect. Due to the emergence of the Landau cut along with the usual unitary cut, the DPR is found to be largely enhanced in the low invariant mass region. Owing to the magnetic field and AMM dependence of the thresholds of these cuts, we find that the kinematically forbidden gap between the Unitary and Landau cuts vanishes at sufficiently high temperature, density and magnetic field leading to the generation of a continuous spectrum of dilepton emission over the whole invariant mass region. In order to see the effects of strangeness and confinement-deconfinement, the rates are compared with the three-flavor NJL and the two-flavor NJL and PNJL models.

    Comments:
    Version published in Physical Review D
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2104.11425 [pdf]
    PRD(2021)·35 citations
  2. 05

    [Submitted on 23 Apr 2021] (cross-list from hep-ph)

    Skyrmions in a magnetic field and domain wall formation in dense nuclear matter

    Shi Chen🇯🇵 · Kenji Fukushima🇯🇵 · Zebin Qiu🇯🇵

    We elucidate magnetic effects in the skyrmion system to probe into the dense nuclear matter. We find a deformed dipole structure of a baryon induced by a magnetic field. We then extend our scope to stacked Skyrme crystal layers to scrutinize phases of magnetized nuclear matter. We observe a quantized magnetic flux and identify a phase transition from a crystalline state to a domain wall corresponding to a topological transmutation from to . We establish the phase diagram, which could be explored also in analogous systems with two-component Bose-Einstein condensates.

    Comments:
    6 pages, 5 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2104.11482 [pdf]
    PRD(2022)·32 citations
  3. 06

    [Submitted on 23 Apr 2021] (cross-list from hep-ph)

    Novel observables for exploring QCD collective evolution and quantum entanglement within individual jets

    Austin Baty🇺🇸 · Parker Gardner🇺🇸 · Wei Li🇺🇸

    We postulate that non-perturbative QCD effects occurring during parton fragmentation can result in collective effects of a multi-parton system, reminiscent of those observed in high-energy hadronic or nuclear interactions with large final-state particle multiplicity. Proton-proton collisions at the Large Hadron Collider showed surprising signatures of a strongly interacting, thermalized quark-gluon plasma, which was thought only to form in collisions of large nuclear systems. Another puzzle observed earlier in collisions is that production yields of various hadron species appear to follow a thermal-like distribution with a common temperature. We propose searches for thermal and collective properties resulting from parton fragmentation processes using high multiplicity jets in high-energy elementary collisions. Several novel observables are studied using the PYTHIA 8 Monte Carlo event generator. Experimental observation of such collectivity will offer a new view of non-perturbative QCD dynamics of multi-parton systems at the smallest scales. Absence of any collective effects may offer new insights into the role of quantum entanglement in the observed thermal behavior of particle production in high energy collisions.

    Comments:
    14 pages, 12 figures. Updated to mirror version accepted by journal
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2104.11735 [pdf]
    PRC(2023)·37 citations
  4. 07

    [Submitted on 23 Apr 2021] (cross-list from astro-ph.SR)

    "In-System" Fission-Events: An Insight into Puzzles of Exoplanets and Stars?

    Elizabeth P. Tito🇺🇸 · Vadim I. Pavlov🇫🇷

    In expansion of our recent proposal (Physics, 2020, 2, 213-276) that the solar system's evolution occurred in two stages -- during the first stage, the gaseous giants formed (via disk instability), and, during the second stage (caused by an encounter with a particular stellar-object leading to "in-system" fission-driven nucleogenesis), the terrestrial planets formed (via accretion) -- we emphasize here that the mechanism of formation of such stellar-objects is generally universal and therefore encounters of such objects with stellar-systems may have occurred elsewhere across galaxies. If so, their aftereffects may perhaps be observed as puzzling features in the spectra of individual stars (such as idiosyncratic chemical enrichments) and/or in the structures of exoplanetary systems (such as unusually high planet densities or short orbital periods). This paper reviews and reinterprets astronomical data within the "fission-events framework." Classification of stellar systems as "pristine" or "impacted" is offered.

    Comments:
    Review, 26 pages, 13 figures
    Subjects:
    Solar and Stellar Astrophysics (astro-ph.SR); astro-ph.EP (astro-ph.EP); Astrophysics of Galaxies (astro-ph.GA); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2104.11744 [pdf]
    Universe(2021)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE