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Nuclear Theory·nucl-th

Tuesday·June 13, 2017

6 papers—5 primary·1 cross-listed

All6Primary5Cross-lists1
  1. 01

    Heavy Quarks in Turbulent QCD Plasmas

    Stanislaw Mrowczynski🇵🇱

    The quark-gluon plasma, which is produced at an early stage of ultrarelativistic heavy-ion collisions, is expected to be initially strongly populated with chromodynamic fields. We address the question how heavy quarks interact with such a turbulent plasma in comparison with an equilibrated one of the same energy density. For this purpose we derive a Fokker-Planck transport equation of heavy quarks embedded in a plasma of light quarks and gluons. We first discuss the equilibrium plasma and then the turbulent one applying the same approach, where the heavy quarks interact not with the plasma constituents but rather with the long wavelength classical fields. We first consider the three schematic models of isotropic trubulent plasma and then the simplified model of glasma with the chromodynamic fields only along the beam direction. The momentum broadening and collisional energy loss of a test heavy quark are computed and compared to those of equilibrium plasma of the same energy density.

    nucl-thhep-phEPJA(2018)·57 citations
  2. 02

    A connection between angular dependent phase ambiguities and the uniqueness of the partial wave decomposition

    A. Švarc · Y. Wunderlich · H. Osmanović · M. Hadžimehmedović · R. Omerović · J. Stahov · V. Kashevarov · K. Nikonov · M. Ostrich · L. Tiator · R. Workman

    Unconstrained partial-wave amplitudes obtained at discrete energies from fits to complete sets of experimental data may not vary smoothly with energy, and are in principle non-unique. We demonstrate how this behavior can be ascribed to the continuum ambiguity. Starting from the spinless scattering case, we demonstrate how an unknown overall phase depending on energy and angle mixes the structures seen in the associated partial-wave amplitudes making the partial wave decomposition non-unique, and illustrate it on a simple toy model. We then apply these principles to pseudo-scalar meson photoproduction and show that the non-uniqueness effect can be removed through a phase rotation, allowing a consistent comparison with model amplitudes. The effect of this phase ambiguity is also considered for Legendre expansions of experimental observables. 5 pages,

    nucl-thPRC(2018)·23 citations
  3. 03

    Comment on "Six-body bound system calculations in the case of effective core structure" [Eur. Phys. J. Plus (2016) 131: 240]

    M. R. Hadizadeh · M. Radin · S. Bayegan

    The authors argue that the calculated He binding energies by the solution of the coupled Yakubovsky integral equation in a partial wave decomposition reported by E. Ahmadi Pouya and A. A. Rajabi [Eur. Phys. J. Plus (2016) 131: 240] are incorrect. The formalism of the paper has serious mistakes and the numerical results are not reproducible and cannot be validated.

    nucl-th0 citations
  4. 04

    Multi-Nucleon Transfer in Central Collisions of U + U

    S. Ayik · B. Yilmaz · O. Yilmaz · A. S. Umar · G. Turan

    Quantal diffusion mechanism of nucleon exchange is studied in the central collisions of U + U in the framework of the stochastic mean-field (SMF) approach. For bombarding energies considered in this work, the di-nuclear structure is maintained during the collision. Hence, it is possible to describe nucleon exchange as a diffusion process for mass and charge asymmetry. Quantal neutron and proton diffusion coefficients, including memory effects, are extracted from the SMF approach and the primary fragment distributions are calculated.

    nucl-thPRC(2017)·50 citations
  5. 05

    Description of Charged Particle Pseudorapidity Distributions in Pb+Pb Collisions with Tsallis Thermodynamics

    Y. Gao🇨🇳 · H. Zheng🇮🇹 · L.L. Zhu🇨🇳 · A. Bonasera🇺🇸

    The centrality dependence of pseudorapidity distributions for charged particles produced in Au+Au collisions at GeV and 200 GeV at RHIC, and in Pb+Pb collisions at TeV at LHC are investigated in the fireball model, assuming that the rapidity axis is populated with fireballs following one distribution function. We assume that the particles in the fireball fulfill the Tsallis distribution. The theoretical results are compared with the experimental measurements and a good agreement is found. Using these results, the pseudorapidity distributions of charged particles produced in Pb+Pb central collisions at TeV and 10 TeV are predicted.

    nucl-thhep-phEPJA(2017)·14 citations
  6. 06

    Derivation of the gap and Bethe-Salpeter equations at large limit and symmetry preserving truncations

    Hui-Feng Fu🇨🇳 · Qing Wang🇨🇳 · Libo Jiang🇺🇸

    We develop a framework for deriving Dyson-Schwinger Equations (DSEs) and Bethe-Salpeter Equation (BSE) in QCD at large limit. The starting point is a modified form (with auxiliary fields) of QCD generating functional. This framework provides a natural order-by-order truncation scheme for DSEs and BSE, and the kernels of the equations up to any order are explicitly given. Chiral symmetry (at chiral limit) is preserved in any order truncation, so it exemplifies the symmetry preserving truncation scheme. It provides a method to study DSEs and BSE beyond the Rainbow-Ladder truncation, and is especially useful to study contributions from non-Abelian dynamics (those arise from gluon self-interactions). We also derive the equation for the quark-ghost scattering kernel, and discuss the Slavnov-Taylor identity connecting the quark-gluon vertex, the quark propagator and the quark-ghost scattering kernel.

    ↳ hep-thnucl-thPRD(2017)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE