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Nuclear Theory·nucl-th

Thursday·January 4, 2018

5 papers—3 primary·2 cross-listed

All5Primary3Cross-lists2
  1. 04

    In-Medium Electromagnetic Form Factor with a Symmetric Vertex in a Light Front Approach

    George H. S. Yabusaki (Instituto Tecnológico de Aeronáutica - ITA and LFTC - Cruzeiro do Sul)🇧🇷 · J. P. B. C. de Melo (LFTC - Cruzeiro do Sul)🇧🇷 · Wayne de Paula (Instituto Tecnológico de Aeronáutica - ITA)🇧🇷 · K. Tsushima (LFTC - Cruzeiro do Sul)🇧🇷 · T. Frederico (Instituto Tecnológico de Aeronáutica - ITA)🇧🇷

    Using the light-front kaon wave function based on a Bethe-Salpeter amplitude model for the quark-antiquark bound state, we study the Electromagnetic Form Factor (EMFF) of the kaon in nuclear medium within the framework of light-front field theory. The kaon model we adopt is well constrained by previous and recent studies to explain its properties in vacuum. The in-medium kaon EMFF is evaluated for the + component of the electromagnetic current, , in the Breit frame. In order to consistently incorporate the constituent up and antistrange quarks of the kaon immersed in symmetric nuclear matter, we use the Quark-Meson Coupling (QMC) model, which has been widely applied to various hadronic and nuclear phenomena in a nuclear medium with success. We predict the in-medium modification of the kaon EMFF in symmetric nuclear matter. It is found that, after a fine tuning of the regulator mass, i.e. GeV, the model is suitable to fit the available experimental data in vaccum within the theoretical uncertainties, and based on this we predict the in-medium modification of the EMFF.

    ↳ hep-phhep-exnucl-exnucl-thFew Body Syst.(2018)·7 citations
  2. 05

    Parton self-energies for general momentum-space anisotropy

    Babak S. Kasmaei🇺🇸 · Michael Strickland🇺🇸

    We introduce an efficient general method for calculating the self-energies, collective modes, and dispersion relations of quarks and gluons in a momentum-anisotropic high-temperature quark-gluon plasma. The method introduced is applicable to the most general classes of deformed anisotropic momentum distributions and the resulting self-energies are expressed in terms of a series of hypergeometric basis functions which are valid in the entire complex phase-velocity plane. Comparing to direct numerical integration of the self-energies, the proposed method is orders of magnitude faster and provides results with similar or better accuracy. To extend previous studies and demonstrate the application of the proposed method, we present numerical results for the parton self-energies and dispersion relations of partonic collective excitations for the case of an ellipsoidal momentum-space anisotropy. Finally, we also present, for the first time, the gluon unstable mode growth rate for the case of an ellipsoidal momentum-space anisotropy.

    ↳ hep-phnucl-thPRD(2018)·16 citations

Affiliations

first authorsco-authorsvia INSPIRE