Renormalization of the jet-quenching parameter

Hot Quarks 2014: Workshop for young scientists on the physics of ultrarelativistic nucleus-nucleus collisions

Mehtar-Tani, Yacine^1

Institut de Physique Théorique, CEA Saclay, Gif-sur-Yvette

F-91191, France^1

关键词: Double logarithms;    Its standards;    Jet quenching;    Medium size;    Radiative corrections;    Radiative energy loss;    Renormalization;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/612/1/012003/pdf
DOI  :  10.1088/1742-6596/612/1/012003

来源: IOP

【 摘 要 】

In the context of the recently derived probabilistic picture of in-medium jet evolution, we study radiative corrections which yield potentially large double logarithms, αsln2L, for large enough medium length L. We show that these large corrections are universal and can be reabsorbed in a renormalization of the jet quenching parameter controlling both momentum broadening and energy loss. The renormalized jet-quenching parameter is enhanced compared to its standard perturbative estimate. As a particular consequence, the radiative energy loss scales with medium size L as L2+γ, with γ = 2√αsNc/π, as compared to the standard scaling in L2.