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Nuclear Theory·nucl-th

Friday·August 4, 2017

4 papers—2 primary·2 cross-listed

All4Primary2Cross-lists2
  1. 03

    [Submitted on 2 Aug 2017] (cross-list from hep-ph)

    Hadron Resonance Gas with Repulsive Interactions and Fluctuations of Conserved Charges

    P. Huovinen🇵🇱 · P. Petreczky🇺🇸

    We discuss the role of repulsive baryon-baryon interactions in a hadron gas using relativistic virial expansion and repulsive mean field approaches. The fluctuations of the baryon number as well as strangeness-baryon correlations are calculated in the hadron resonance gas with repulsive interactions and compared with the recent lattice QCD results. In particular, we calculate the difference between the second and fourth order fluctuations and correlations of baryon number and strangeness, that have been proposed as probes of deconfinement. We show that for not too high temperatures these differences could be understood in terms of repulsive interactions.

    Comments:
    12pages, 2 figures, ReVTeX, published version, unexpanded mean field results added
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1708.00879 [pdf]
    PLB(2018)·82 citations
  2. 04

    [Submitted on 3 Aug 2017] (cross-list from hep-ph)

    Hard photoproduction of a diphoton with a large invariant mass

    A. Pedrak🇵🇱 · B. Pire🇫🇷 · L. Szymanowski🇵🇱 · J. Wagner🇵🇱

    The electromagnetic probe has proven to be a very efficient way to access the dimensional structure of the nucleon, particularly thanks to the exclusive Compton processes. We explore the hard photoproduction of a large invariant mass diphoton in the kinematical regime where the diphoton is nearly forward and its invariant mass is the hard scale enabling to factorize the scattering amplitude in terms of generalized parton distributions. This amplitude has a very peculiar and interesting analytic structure. We calculate unpolarized cross sections and the angular asymmetry triggered by a linearly polarized photon beam.

    Comments:
    8 pages, 9 figures. Version 2, as to be published in Phys Rev D96, contains minor improvements including a brief comparison of different GPD models and a brief discussion of the very high energy behavior of the cross section. Version 3 includes the erratum published in Phys Rev D100 (2019) no.3, 039901
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1708.01043 [pdf]
    PRD(2017)·62 citations

Affiliations

first authorsco-authorsvia INSPIRE