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Nuclear Theory·nucl-th

Wednesday·June 28, 2017

5 papers—2 primary·3 cross-listed

All5Primary2Cross-lists3
  1. 03

    [Submitted on 26 Jun 2017] (cross-list from hep-ph)

    Rapidity distribution of particle multiplicity in DIS at small x

    B. Blok (1) · Yu. Dokshitzer (2) · M. Strikman (3) ((1) Technion · (2) LPTHE · (3) Penn State)

    Analytical study of the rapidity distribution of the final state particles in deep inelastic scattering at small x is presented. We separate and analyse three sources of particle production: fragmentation of the quark-antiquark pair, accompanying coherent soft gluon radiation due to octet color exchange in the t-channel, and fragmentation of gluons that form parton distribution functions. Connection to Catani-Ciafaloni-Fiorani-Marchesini (CCFM) equations and the role of gluon reggezation are also discussed.

    Comments:
    14 pages, 6 Figures. Abstract extended, minor misprints corrected, derivations improved and explanations are streamlined. Published in Physics Letters, B/
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1706.08585 [pdf]
    PLB(2017)·2 citations
  2. 04

    [Submitted on 27 Jun 2017] (cross-list from hep-ph)

    Thermalization in small system of hadron gas and high-multiplicity pp events

    Nachiketa Sarkar🇮🇳 · Premomoy Ghosh🇮🇳

    We study the system-size dependence of Knudsen number, a measure of degree of thermalization, for hadron resonance gas that follows the Lattice-QCD equation of state at zero chemical potential. A comparison between Knudsen numbers for the AuAu collisions at RHIC and the hadron gas of size similar to the size of high-multiplicity pp events at LHC, reassures the applicability of hydrodynamics in interpreting the features of particle production in high-multiplicity pp events.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1706.08679 [pdf]
    PRC(2017)·19 citations
  3. 05

    [Submitted on 27 Jun 2017] (cross-list from hep-ph)

    Precision Theoretical Analysis of Neutron Radiative Beta Decay to Order "O(\alpha^2/\pi^2)"

    A. N. Ivanov🇦🇹 · R. Höllwieser🇦🇹 · N. I. Troitskaya🇦🇹 · M. Wellenzohn🇦🇹 · Ya. A. Berdnikov🇷🇺

    In the Standard Model (SM) we calculate the decay rate of the neutron radiative beta decay to order "O(\alpha^2/\pi^2 ~ 10^{-5})", where "\alpha$"is the fine--structure constant, and radiative corrections to order "O(\alpha/\pi ~ 10^{-3})". The obtained results together with the recent analysis of the neutron radiative beta decay to next-to-leading order in the large proton-mass expansion, performed by Ivanov et al. Phys. Rev. D95, 033007 (2017), describe recent experimental data by the RDK II Collaboration (Bales et al., Phys. Rev. Lett. 116, 242501 (2016)) within 1.5 standard deviations. We argue a substantial influence of strong low-energy interactions of hadrons coupled to photons on the properties of the amplitude of the neutron radiative beta decay under gauge transformations of real and virtual photons.

    Comments:
    46 pages, 6 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1706.08687 [pdf]
    PRD(2017)·13 citations

Affiliations

first authorsco-authorsvia INSPIRE