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Nuclear Theory·nucl-th

Wednesday·July 13, 2016

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 04

    [Submitted on 8 Jul 2016] (cross-list from hep-ph)

    Momentum broadening in unstable quark-gluon plasma

    M.E. Carrington🇨🇦 · St. Mrówczyński🇵🇱 · B. Schenke🇺🇸

    Quark-gluon plasma produced at the early stage of ultrarelativistic heavy ion collisions is unstable, if weakly coupled, due to the anisotropy of its momentum distribution. Chromomagnetic fields are spontaneously generated and can reach magnitudes much exceeding typical values of the fields in equilibrated plasma. We consider a high energy test parton traversing an unstable plasma that is populated with strong fields. We study the momentum broadening parameter which determines the radiative energy loss of the test parton. We develop a formalism which gives as the solution of an initial value problem, and we focus on extremely oblate plasmas which are physically relevant for relativistic heavy ion collisions. The parameter is found to be strongly dependent on time. For short times it is of the order of the equilibrium value, but at later times grows exponentially due to the interaction of the test parton with unstable modes and becomes much bigger than the value in equilibrium. The momentum broadening is also strongly directionally dependent and is largest when the test parton velocity is transverse to the beam axis. Consequences of our findings for the phenomenology of jet quenching in relativistic heavy ion collisions are briefly discussed.

    Comments:
    43 pages, 5 figures, published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1607.02359 [pdf]
    PRC(2017)·31 citations
  2. 05

    [Submitted on 12 Jul 2016] (cross-list from hep-ph)

    Saturation scale fluctuations and multi-particle rapidity correlations

    Adam Bzdak🇵🇱 · Kevin Dusling🇺🇸

    We study the effect of intrinsic fluctuations of the proton saturation momentum scale on event-by-event rapidity distributions. Saturation scale fluctuations generate an asymmetry in the single particle rapidity distribution in each event resulting in genuine n-particle correlations having a component linear in the rapidities of the produced particles, . We introduce a color domain model that naturally explains the centrality dependence of the two-particle rapidity correlations recently measured by ATLAS while constraining the probability distribution of saturation scale fluctuations in the proton. Predictions for n = 4, 6 and 8 particle correlations find that the four and eight-particle cumulant change sign at an intermediate multiplicity, a signature which could be tested experimentally.

    Comments:
    12 pages, 5 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1607.03219 [pdf]
    PRC(2016)·6 citations
  3. 06

    [Submitted on 12 Jul 2016] (cross-list from hep-ph)

    Understanding spin parity of and in a hadronic molecular state picture

    Jun He🇨🇳

    The hidden-charmed pentaquark and the charmonium-like state are investigated as a and a molecular state, respectively. The spin parities of these two states cannot be well understood if only S-wave and interactions are considered. In this work, the interactions are studied in a quasipotential Bethe-Salpeter equation approach with a partial wave decomposition on spin parity , and the contributions of different partial waves are studied in a two-channel scattering model including a generating channel and an observation channel. Two poles at and MeV are produced from the interaction coupled with the channel in wave and wave, respectively. The peak for the state has a comparable height as that of the state in the invariant mass spectrum. The interaction coupled with the channel is studied and a pole at MeV is produced in wave, which corresponds to P-wave interaction. The pole from S-wave interaction is far below that from P-wave interaction even the threshold, so cannot be observed in the channel. The result suggests that in these cases a state carrying a spin parity corresponding to P-wave interaction should be taken as seriously as these carrying a spin parity corresponding to S-wave interaction in the hadronic molecular state picture.

    Comments:
    7 pages, 5 figures. published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1607.03223 [pdf]
    PRD(2017)·53 citations
  4. 07

    [Submitted on 12 Jul 2016] (cross-list from hep-ph)

    Dynamically Generated

    Takayasu Sekihara (JAEA, Ibaraki)🇯🇵

    We show that the resonance can be dynamically generated in the -wave --- coupled-channels chiral unitary approach. In our model, the resonance appears near the threshold as a molecular state and the experimental data are reproduced well. We discuss properties of the dynamically generated .

    Comments:
    4 pages, 4 EPS figures, talk given at the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015), Tohoku, Japan, 7-12 Sep. 2015
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1607.03374 [pdf]
    JPS Conf.Proc.(2017)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE