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Quantum kinetic theory of spin polarization of massive quarks in perturbative QCD: Leading log

机译:扰动QCD中大夸克自旋极化的量子动力学理论:超前对数

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We present the quantum kinetic equation for the spin polarization of massive quarks in leading-log order of perturbative QCD, which describes time evolution of the spin density matrix in momentum space of a massive quark interacting with a background QCD plasma. We find that the time evolution operator of the spin density matrix or the quantum kinetic collision terms are universally of order α s 2 log ( 1 / α s ) in terms of the QCD coupling constant α s = g 2 / ( 4 π ) . Our quantum kinetic equation is valid for an arbitrary quark mass m ? m D ~ g T , where m D is the Debye mass, and can be used to study relaxation dynamics of spin polarization of massive quarks in the perturbative QCD regime.
机译:我们以扰动QCD的对数先导顺序给出了大夸克自旋极化的量子动力学方程,该方程描述了与背景QCD等离子体相互作用的大夸克动量空间中自旋密度矩阵的时间演化。我们发现,根据QCD耦合常数αs = g 2 /(4π),自旋密度矩阵或量子动力学碰撞项的时间演化算符普遍为αs 2 log(1 /αs)级。我们的量子动力学方程对任意夸克质量m?有效。 m D〜g T,其中m D是德拜质量,可用于研究扰动QCD态下大夸克自旋极化的弛豫动力学。

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