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Nuclear Theory·nucl-th

Friday·September 18, 2015

13 papers—7 primary·6 cross-listed

All13Primary7Cross-lists6
  1. 08

    [Submitted on 16 Sept 2015] (cross-list from nucl-ex)

    Kaon pair production in proton-nucleus collisions at 2.83 GeV kinetic energy

    Yu.T. Kiselev🇷🇺 · M. Hartmann · A. Polyanskiy🇩🇪 · E.Ya. Paryev🇷🇺 · S. Barsov🇷🇺 · M. Buescher · S. Dymov🇷🇺 · R. Gebel🇯🇵 · V. Hejny🇯🇵 · A. Kacharava🇯🇵 · I. Keshelashvili🇯🇵 · B. Lorentz🇯🇵 and 14 other authors

    The production of non-phi K+K- pairs by protons of 2.83 GeV kinetic energy on C, Cu, Ag, and Au targets has been investigated using the COSY-ANKE magnetic spectrometer. The K- momentum dependence of the differential cross section has been measured at small angles over the 0.2--0.9 GeV/c range. The comparison of the data with detailed model calculations indicates an attractive K- -nucleus potential of about -60 MeV at normal nuclear matter density at a mean momentum of 0.5 GeV/c. However, this approach has difficulty in reproducing the smallness of the observed cross sections at low K- momenta.

    Comments:
    7 pages, 5 figures, 1 table
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1509.04830 [pdf]
    PRC(2015)·6 citations
  2. 09

    [Submitted on 16 Sept 2015] (cross-list from hep-th)

    Hydrodynamics, resurgence and trans-asymptotics

    Gokce Basar🇺🇸 · Gerald V. Dunne🇺🇸

    The second-order hydrodynamical description of a homogeneous conformal plasma that undergoes a boost- invariant expansion is given by a single nonlinear ordinary differential equation, whose resurgent asymptotic properties we study, developing further the recent work of Heller and Spalinski [Phys. Rev. Lett. 115, 072501 (2015)]. Resurgence clearly identifies the non-hydrodynamic modes that are exponentially suppressed at late times, analogous to the quasi-normal-modes in gravitational language, organizing these modes in terms of a trans-series expansion. These modes are analogs of instantons in semi-classical expansions, where the damping rate plays the role of the instanton action. We show that this system displays the generic features of resurgence, with explicit quantitative relations between the fluctuations about different orders of these non-hydrodynamic modes. The imaginary part of the trans-series parameter is identified with the Stokes constant, and the real part with the freedom associated with initial conditions.

    Comments:
    29 pages, 13 figures
    Subjects:
    High Energy Physics — Theory (hep-th); Mathematical Physics (math-ph); math.MP (math.MP); Nuclear Theory (nucl-th)
    arXiv:
    1509.05046 [pdf]
    PRD(2015)·94 citations
  3. 10

    [Submitted on 17 Sept 2015] (cross-list from hep-ph)

    Quenching of inclusive and tagged b-jets at the LHC

    Hongxi Xing🇺🇸 · Jinrui Huang🇺🇸 · Zhong-Bo Kang🇺🇸 · Ivan Vitev🇺🇸

    We present theoretical predictions for the nuclear-induced attenuation of the differential cross sections for inclusive and tagged b-jet production in heavy ion collisions at the LHC. We find that for inclusive b-jet production at high transverse momentum the mass effects are negligible, and that the attenuation is comparable to the one observed for light jets. On the other hand, for isolated-photon and B-meson-tagged b-jets the sample of events with heavy quarks produced at the early stages of the collision is greatly enhanced. Thus, these tagged b-jet final-states have a much more direct connection to the physics of b-quark energy loss. We present theoretical predictions for the quenching of such tagged b-jet events at the LHC and the QGP-induced modification of the related momentum imbalance and asymmetry. We demonstrate that these tagged processes can be used to accurately study the physics of heavy quark production and propagation in dense QCD matter.

    Comments:
    4 pages, 5 figures, talk presented by Hongxi Xing at the Hard Probes 2015 conference
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1509.05126 [pdf]
    Nucl.Part.Phys.Proc.(2016)·3 citations
  4. 11

    [Submitted on 17 Sept 2015] (cross-list from hep-ph)

    Excitation function Analysis for Charmonium Production in Heavy-Ion Collisions

    Kai Zhou🇩🇪

    Both color screening and regeneration are hot medium effects on charmonium production in heavy ion collisions. While they affect in an opposite way the charmonium yield, their competition in transverse dynamics bring sensitivity to the ratio of averaged transverse momentum suqare for charmonium, which thus can reveal more nature of the QCD medium created from the collisions. We make an excitation analysis based on transport approach to illustrate such a picuture.

    Comments:
    4 pages, 3 figures, SQM2015 proceedings
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1509.05252 [pdf]
    J.Phys.Conf.Ser.(2016)·0 citations
  5. 12

    [Submitted on 17 Sept 2015] (cross-list from hep-ph)

    Proof of Factorization of Production in Non-Equilibrium QCD at RHIC and LHC

    Gouranga C. Nayak🇺🇸

    suppression/production is one of the main signature of quark-gluon plasma detection at RHIC and LHC. In order to study suppression/production in high energy heavy-ion collisions at RHIC and LHC, one needs to prove the factorization theorem of production in non-equilibrium QCD medium, otherwise one will predict infinite cross section of . In this paper we prove factorization theorem of production in non-equilibrium QCD at RHIC and LHC at all order in coupling constant.

    Comments:
    29 pages latex. arXiv admin note: substantial text overlap with arXiv:1509.01148; text overlap with arXiv:1506.02593, arXiv:1506.02651, arXiv:1508.01194
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1509.05303 [pdf]
    1 citation
  6. 13

    [Submitted on 17 Sept 2015] (cross-list from hep-ph)

    Dependence of elastic hadron collisions on impact parameter

    Jiri Prochazka🇨🇿 · Milos V. Lokajicek🇨🇿 · Vojtech Kundrat🇨🇿

    Elastic proton-proton collisions represent probably the greatest ensemble of available measured data, the analysis of which may provide large amount of new physical results concerning fundamental particles. It is, however, necessary to analyze first some conclusions concerning pp collisions and their interpretations differing fundamentally from our common macroscopic experience. It has been argued, e.g., that elastic hadron collisions have been more central than inelastic ones, even if any explanation of the existence of so different process, i.e., elastic and inelastic (with hundreds of secondary particles) collisions, under the same conditions has not been given until now. The given conclusion has been based on a greater number of simplifying mathematical assumptions (done already in earlier calculations), without their influence on physical interpretation being analyzed and entitled; the corresponding influence has started to be studied in the approach based on eikonal model. The possibility of peripheral interpretation of elastic collisions will be demonstrated and corresponding results summarized. The arguments will be given why no preference may be given to the mentioned centrality against the standard peripheral behaviour. The corresponding discussion of contemporary description of elastic hadronic collision in dependence on impact parameter will be summarized and the justification of some important assumptions will be considered.

    Comments:
    24 pages, final version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1509.05343 [pdf]
    Eur.Phys.J.Plus(2016)·12 citations

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