用微扰QCD解释射流猝灭
Explaining jet quenching with perturbative QCD alone
摘要：
我们提出了一个超越程函近似的微扰QCD中喷注猝灭的新表述。介质中的多重散射通过QCD中的红外连续（2 -> 2）散射矩阵元和描述进一步发射的部分子簇射来模拟。这些过程之间的相互作用被安排在形成时间的限制，使相干发射可以一致地处理。新兴的部分子强子化的隆德弦模型，调整到描述LEP数据与部分子淋浴。在此基础上，我们得到了RHIC和LHC核修改因子R_AA的较好描述。
英文摘要：
We present a new formulation of jet quenching in perturbative QCD beyond the eikonal approximation. Multiple scattering in the medium is modelled through infra-red-continued (2 -> 2) scattering matrix elements in QCD and the parton shower describing further emissions. The interplay between these processes is arranged in terms of a formation time constraint such that coherent emissions can be treated consistently. Emerging partons are hadronised by the Lund string model, tuned to describe LEP data in conjunction with the parton shower. Based on this picture we obtain a good description of the nuclear modification factor R_AA at RHIC and LHC.
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