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Nuclear Theory·nucl-th

Wednesday·December 19, 2018

12 papers—4 primary·8 cross-listed

All12Primary4Cross-lists8
  1. 01

    [Submitted on 17 Dec 2018]

    Chiral QCD phase in equilibrium with Hadron Gas and the location of the critical point

    N. G. Antoniou🇬🇷 · F. K. Diakonos🇬🇷 · A. S. Kapoyannis🇬🇷

    We develop a description of the equation of state of QCD matter with restored chiral symmetry, which is in thermal and chemical equilibrium with the hadronic phase. The hadron gas is described with thermodynamically consistent volume corrections. The chiral phase is composed of a set of few quark condensates, each of which corresponds to a family of hadrons with specific quark content. On the boundary between the two phases we apply the requirement of conservation of particle numbers per family. We use lattice calculations for temperatures below the transition curve to determine hadronic volumes. We find that the pion system plays decisive role in the shift of the transition from higher order (crossover) to first order. For four volume models we calculate the location of the critical point as function of critical temperature at vanishing baryon density. Particularly, if we additionally impose the equality between the densities of quarks contained in mesons and baryons, we find a critical point residing in the interval of baryon chemical potential 233-267 MeV and of temperature 153-158 MeV.

    Comments:
    51 pages, 22 figures. In Version 4: Three sets of new calculations carried out with hadronic states of Particle Data Group 23 (fully and partially verified) and the inclusion of the f_0(500) hadron state (with two choices for its mass). Comparison between Lattice QCD and Hadron Gas entropy density. Application of certain needed corrections
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1812.07006 [pdf]
    0 citations
  2. 02

    [Submitted on 18 Dec 2018]

    Nucleon microscopy in proton-nucleus scattering via analysis of bremsstrahlung emission

    Sergei P. Maydanyuk (1 and 2)🇨🇳 · Peng-Ming Zhang (1)🇨🇳 · Li-Ping Zou (1) ((1) Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China, (2) Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kiev, Ukraine)🇨🇳

    We investigate an idea, how to use analysis of the bremsstrahlung photons to study the internal structure of proton under nuclear reaction with nucleus. A new model is constructed to describe bremsstrahlung emission of photons which accompanies the scattering of protons off nuclei. Our bremsstrahlung formalism uses many-nucleon basis that allows to analyze coherent and incoherent bremsstrahlung emissions. As scattered proton can be under the influence of strong forces and produces the largest bremsstrahlung contribution to full spectrum, we focus on accurate determination of its quantum evolution concerning nucleus basing on quantum mechanics and scattering theory. For such a motivation, we at first time generalize Pauli equation with interacting potential describing evolution of fermion inside strong field, with including the electromagnetic form-factors of nucleon basing on DIS theory. Anomalous magnetic momenta of nucleons reinforce our motivation to develop such a formalism, starting from low energy. The full bremsstrahlung spectrum in our model (after renormalization) is dependent on form-factors of the scattered proton. For calculations, we choose the scattering of at proton beam energy of 190~MeV, where experimental bremsstrahlung data were obtained with high accuracy. We show that the full bremsstrahlung spectrum is sensitive to the form-factors of the scattered proton. In the limit without such form-factors, we reconstruct our previous result (where internal structure of the scattered proton was not studied).

    Comments:
    35 pages, 2 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1812.07180 [pdf]
    PRC(2019)·10 citations
  3. 03

    [Submitted on 17 Dec 2018]

    Charmonium decay widths in magnetized matter

    Amruta Mishra🇮🇳 · Amal Jahan CS🇮🇳 · Shivam Kesarwani🇮🇳 · Haresh Raval🇮🇳 · Shashank Kumar🇮🇳 · Jitendra Meena🇮🇳

    We study the partial decay widths of the charmonium states (, , , , ) to ( or ) in isospin asymmetric nuclear matter, in the presence of strong magnetic fields. The in-medium partial decay widths of charmonium states to are calculated within a light quark--antiquark pair creation model, namely the model, using the in--medium masses of the charmonia as well as and mesons in the magnetized nuclear matter obtained within a chiral effective model. The presence of a magnetic field leads to Landau quantization of the energy levels of the proton in the nuclear medium. The effects of magnetic field and isospin asymmetry on the charmonium decay widths to are found to be quite prominent. The effects of the anomalous magnetic moments have also been taken into consideration for obtaining the in-medium masses of these heavy flavour mesons, used to calculate the partial decay widths of the charmonium states. The medium modifications of the charmonium decay widths can have observable consequences on the production of the charmed mesons in high energy asymmetric heavy ion collision experiments.

    Comments:
    29 pages, 8 figures, to be published in Eur. Phys. Jour. A. arXiv admin note: text overlap with arXiv:1803.04322, arXiv:1901.06259, arXiv:1807.07572, arXiv:1811.04622, arXiv:1801.06405
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1812.07397 [pdf]
    EPJA(2019)·29 citations
  4. 04

    [Submitted on 18 Dec 2018]

    Jet structure in integrated EPOS3-HQ approach

    Iurii Karpenko🇫🇷 · Martin Rohrmoser🇵🇱 · Pol Gossiaux🇫🇷 · Joerg Aichelin🇫🇷 · Klaus Werner🇫🇷

    We report on the first results for jet observables from a time-like parton cascade integrated with hydrodynamic evolution within the EPOS3-HQ framework. The hard (jet) partons are produced along with soft partons in the initial state EPOS approach. The soft partons, represented by strings, melt into a thermalized medium which is described by a 3 dimensional event-by-event viscous hydrodynamic approach. The jet partons then propagate in the hydrodynamically expanding medium. The total jet energy gets progressively `degraded' when the partons reaching a thermal energy scale are melted into the hydrodynamic medium via the source terms. The full evolution proceeds in a parallel mode, without separating the thermalized and jet parts. We demonstrate how the transverse expansion of the medium affects the jet structure, and how the medium itself is affected by the jet recoil.

    Comments:
    talk at Hard Probes 2018 conference (Aix-Les-Bains, France, 30 September - 5 October, 2018)
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1812.07465 [pdf]
    PoS(2018)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE