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Nuclear Theory·nucl-th

Friday·May 20, 2016

4 papers—2 primary·2 cross-listed

All4Primary2Cross-lists2
  1. 03

    [Submitted on 19 May 2016] (cross-list from hep-ph)

    Double vector meson production in photon - hadron interactions at hadronic colliders

    V.P. Goncalves🇸🇪 · B.D. Moreira🇧🇷 · F.S. Navarra🇧🇷

    In this paper we analyse the double vector meson production in photon -- hadron () interactions at collisions and present predictions for the , and production considering the double scattering mechanism. We estimate the total cross sections and rapidity distributions at LHC energies and compare our results with the predictions for the double vector meson production in interactions at hadronic colliders. We present predictions for the different rapidity ranges probed by the ALICE, ATLAS, CMS and LHCb Collaborations. Our results demonstrate that the and production in collisions is dominated by the double scattering mechanism, while the two - photon mechanism dominates in collisions. Moreover, our results indicate that the analysis of the production at LHC can be useful to constrain the double scattering mechanism.

    Comments:
    9 pages, 5 figures, 2 tables. Revised and enlarged version to be published in the European Physical Journal C
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1605.05840 [pdf]
    EPJC(2016)·26 citations
  2. 04

    [Submitted on 19 May 2016] (cross-list from hep-ph)

    Momentum transport in strongly coupled anisotropic plasmas in the presence of strong magnetic fields

    Stefano Ivo Finazzo (Sao Paulo, IFT)🇧🇷 · Renato Critelli (Sao Paulo U.)🇧🇷 · Romulo Rougemont (Sao Paulo U.)🇧🇷 · Jorge Noronha (Sao Paulo U.)🇧🇷

    We present a holographic perspective on momentum transport in strongly coupled, anisotropic non-Abelian plasmas in the presence of strong magnetic fields. We compute the anisotropic heavy quark drag forces and Langevin diffusion coefficients and also the anisotropic shear viscosities for two different holographic models, namely, a top-down deformation of strongly coupled Super-Yang-Mills (SYM) theory triggered by an external Abelian magnetic field, and a bottom-up Einstein-Maxwell-dilaton (EMD) model which is able to provide a quantitative description of lattice QCD thermodynamics with -flavors at both zero and nonzero magnetic fields. We find that, in general, energy loss and momentum diffusion through strongly coupled anisotropic plasmas are enhanced by a magnetic field being larger in transverse directions than in the direction parallel to the magnetic field. Moreover, the anisotropic shear viscosity coefficient is smaller in the direction of the magnetic field than in the plane perpendicular to the field, which indicates that strongly coupled anisotropic plasmas become closer to the perfect fluid limit along the magnetic field. We also present, in the context of the EMD model, holographic predictions for the entropy density and the crossover critical temperature in a wider region of the phase diagram that has not yet been covered by lattice simulations. Our results for the transport coefficients in the phenomenologically realistic magnetic EMD model could be readily used as inputs in numerical codes for magnetohydrodynamics.

    Comments:
    69 pages, 22 figures, 2 appendices, published in Physical Review D; this version comprises a correction in some points of the previous version of Appendix B (accepted as an erratum in Physical Review D); all the results of the main text remain unchanged
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1605.06061 [pdf]
    PRD(2016)·164 citations

Affiliations

first authorsco-authorsvia INSPIRE