Measuring Parton Energy Loss at RHIC compared to LHC

Abstract

The method of measuring ${\hat{x}}_h={\hat{p}}_{Ta}/{\hat{p}}_{Tt}$, the ratio of the away-parton transverse momentum, ${\hat{p}}_{T_a}$, to the trigger-parton transverse momentum, ${\hat{p}}_{T_t}$, using two-particle correlations at RHIC, will be reviewed. This measurement is simply related to the two new variables introduced at LHC for the di-jet fractional transverse momentum imbalance: ATLAS $A_J=({\hat{p}}_{Tt}-{\hat{p}}_{Ta})/({\hat{p}}_{Tt}+{\hat{p}}_{Ta})=(1-{\hat{x}}_h)/(1+{\hat{x}}_h)$; and CMS $\mean{(\hat{p}_{Tt}-\hat{p}_{Ta})/\hat{p}_{Tt}}= \mean{1-\hat{x}_h}$. Results from two-particle correlations at RHIC for ${\hat{x}}_h$ in p-p and A+A collisions will be reviewed and new results will be presented and compared to LHC results. The importance of comparing any effect in A+A collisions to the same effect effect in p-p collisions will be illustrated and emphasized.

6 pages, 4 figures, to appear in the Proceedings of the 6th International Workshop on High-pT physics at the LHC (04-07 April 2011, Utrecht, The Netherlands)

Cited by in corpus (2)

• Jet momentum dependence of jet quenching in PbPb collisions at sqrt(sNN)=2.76 TeV
• Lessons from RHIC for the LHC and vice versa