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arXiv 1602.07142nucl-th
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动量各向异性和湍流色场对夸克-胶子等离子体中热粒子产生的影响

Impact of momentum anisotropy and turbulent chromo-fields on thermal particle production in quark-gluon plasma medium

Vinod Chandra, V. Sreekanth

摘要:

RHIC中夸克-胶子等离子体(QGP)流体动力学演化过程中存在的动量各向异性可能导致色-韦伯不稳定性和湍流色场,在这种情况下夸克和胶子动量分布的动力学过程由有效扩散的Vlasov方程(线性化)控制.这个线性化的输运方程的修改后的动量分布函数的解决方案导致的夸克/反夸克和胶子的非平衡动量分布函数的数学形式。对这些分布的修改编码了湍流色场和动量各向异性的物理学。在本文中,我们利用这些分布函数来估计QGP介质中的热双轻子产生率。生产率被认为是有明显的各向异性的强度的敏感性。

英文摘要:

Momentum anisotropy present during the hydrodynamic evolution of Quark-Gluon Plasma (QGP) in RHIC may lead to chromo-Weibel instability and turbulent chromo-fields.The dynamics of the quark and gluon momentum distributions in this case is governed by an effective diffusive Vlasov equation (linearized). The solution of this linearized transport equation for the modified momentum distribution functions lead to the mathematical form of non-equilibrium momentum distribution functions of quarks/antiquarks and gluons. The modification to these distributions encode the physics of turbulent color fields and momentum anisotropy. In the present manuscript, we employ these distribution functions to to estimate thermal dilepton production rate in the QGP medium. The production rate is seen to have appreciable sensitivity to the strength of the anisotropy.

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