Speaker
Dr
Yacine Mehtar-Tani
(IPhT)
Description
In the context of the recently derived probabilistic picture of in-medium jet evolution, we study radiative corrections which yield potentially large double logarithms, $\alpha_s \ln^2 L$, for large enough medium length $L$. We show in particular that, due to a large separation of time scales, these corrections can be reabsorbed in a renormalization of the quenching parameter in both the collision rate and radiative rate, preserving the probabilistic picture. As a major consequence of this analysis, the new renormalized jet-quenching parameter is enhanced compared to the standard perturbative estimate. This yields in particular an increase of radiative energy loss of a fast parton traversing a QCD medium, which scales as $L^{2+\gamma}$ where the anomalous dimension $\gamma=2\sqrt{ \alpha_sN_c/\pi}$, as compared to the standard estimate that yields a scaling in $L^2$.
References: arXiv:1311.5823 [hep-ph] (To appear in JHEP),
arXiv:1403.2323 [hep-ph] (To appear in NPA)
Author
Dr
Yacine Mehtar-Tani
(IPhT)
Co-author
Dr
Jean-Paul Blaizot
(IPhT)
