Department of Physics, Duke University, Durham, North Carolina 27708, USA.
Phys Rev Lett. 2010 Dec 31;105(26):262301. doi: 10.1103/PhysRevLett.105.262301. Epub 2010 Dec 21.
We present a successful description of the medium modification of light and heavy flavor jets within a perturbative-QCD-based approach. Only the couplings involving hard partons are assumed to be weak. The effect of the medium on a hard parton, per unit time, is encoded in terms of three nonperturbative, related transport coefficients which describe the transverse momentum squared gained, the elastic energy loss, and diffusion in elastic energy transfer. Scaling the transport coefficients with the temperature of the medium, we achieve a good description of the centrality dependence of the suppression and the azimuthal anisotropy of leading hadrons. Imposing additional constraints based on leading order (LO) hard thermal loop (HTL) effective theory leads to a worsening of the fit, implying the necessity of computing transport coefficients beyond LO HTL.
我们提出了一种基于微扰 QED 的方法，成功地描述了中质修正的轻味和重味喷注。我们仅假设涉及硬部分子的耦合是弱的。介质对硬部分子的影响，在单位时间内，用三个非微扰的相关输运系数来描述，这三个系数描述了横向动量平方的增益、弹性能量损失和弹性能量转移中的扩散。通过用介质的温度来缩放输运系数，我们很好地描述了抑制的中心度依赖性和领头强子的各向异性。基于领头阶（LO）硬热圈（HTL）有效理论施加额外的约束会导致拟合变差，这意味着需要计算超出 LO HTL 的输运系数。
