1202.5537 (Roy A. Lacey et al.)

Scaling patterns for the suppression of charged hadron yields in Pb+Pb
collisions at Root_s = 2.76 TeV: Constraints on transport coefficients    [PDF]

Roy A. Lacey, N. N. Ajitanand, J. M. Alexander, J. Jia, A. Taranenko

Suppression measurements for charged hadrons are used to investigate the path
length (L) and transverse momentum (p_T) dependent jet quenching patterns of
the hot and dense QCD medium produced in Pb+Pb collisions at Root_s =2.76 TeV
at the LHC. The observed scaling patterns, which are similar to those observed
for Au+Au collisions at Root_s = 0.20 TeV at RHIC, show the trends predicted
for jet-medium interactions dominated by radiative energy loss. They also allow
a simple estimate of the transport coefficient $\hat{q}$, which suggests that
the medium produced in LHC collisions is somewhat less opaque than that
produced at RHIC, if the same parton-medium coupling strength is assumed. The
higher temperature produced in LHC collisions could reduce the parton-medium
coupling strength to give identical values for $\hat{q}$ in LHC and RHIC
collisions.

View original: http://arxiv.org/abs/1202.5537