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arXiv 1805.04763nucl-th
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准粒子模型中各向异性热QCD介质中重夸克偶素的离解

Dissociation of heavy quarkonia in an anisotropic hot QCD medium in a Quasi-Particle Model

Mohammad Yousuf Jamal, Indrani Nilima, Vinod Chandra, Vineet Kumar Agotiya

摘要:

本文是Phys.修订版本\ D { \bf 94},094006(2016),其中我们扩展了(动量)各向异性热QCD介质中夸克偶素解离的研究。在RHIC和LHC实验观测到的集体流动表明,动量各向异性存在于碰撞后的几乎所有阶段,因此,在分析中包括其影响是很重要的。采用介质内(修正)势,同时考虑介质的各向异性(扁长和扁长两种情况),确定了重夸克偶素态(径向量子数n = 1和2时的s波charmonia和s波bottomonia)的热宽度和结合能.热QCD介质效应已包括采用准粒子描述。各向异性的存在已经修改了潜在的,然后在一个显着的方式,这些状态的热宽度和结合能。结果表明,一个相当明显的位移的解离温度的值相比,各向同性的情况下。此外,热QCD介质相互作用效应抑制的离解温度相比,我们认为介质作为一个非相互作用的超相对论气体的夸克(反夸克)和胶子的情况下。

英文摘要:

The present article is the follow up work of, Phys.\ Rev.\ D {\bf 94}, 094006 (2016), where we have extended the study of quarkonia dissociation in (momentum) anisotropic hot QCD medium. As evident by the experimentally observed collective flow at RHIC and LHC, the momentum anisotropy is present at almost all the stages after the collision and therefore, it is important to include its effects in the analysis. Employing the in-medium (corrected) potential while considering the anisotropy (both oblate and prolate cases) in the medium, the thermal widths and the binding energies of the heavy quarkonia states (s-wave charmonia and s-wave bottomonia specifically, for radial quantum numbers n = 1 and 2) have been determined. The hot QCD medium effects have been included employing a quasi-particle description. The presence of anisotropy has modified the potential and then the thermal widths and the binding energies of these states in a significant manner. The results show a quite visible shift in the values of dissociation temperatures as compared to the isotropic case. Further, the hot QCD medium interaction effects suppress the dissociation temperature as compared to the case where we consider the medium as a non-interacting ultra-relativistic gas of quarks (anti-quarks) and gluons.

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