Speaker
Description
The $p_\perp$ dependence of the nuclear modification factor $R_{AA}$ measured in PbPb collisions at the LHC exhibits a universal shape, which can be very well reproduced in a simple energy loss model based on the BDMPS medium-induced gluon spectrum. The scaling is observed for various hadron species ($h^\pm$, D, $J/\psi$) in different centrality classes and at both colliding energies, √s=2.76 TeV and √s=5.02 TeV. Results indicate an 10-20% increase of the transport coefficient from √s=2.76 TeV to √s=5.02 TeV, consistent with that of particle multiplicity. Based on this model, a data-driven procedure is suggested, which allows for the determination of the first and second moments of the quenching weight without any prior knowledge of the latter.
