Abstract
The ATLAS experiment at the LHC measures the charged particle spectra and the nuclear modification factor in Pb+Pb collisions at the TeV in a transverse momentum range up to 30 GeV and a pseudorapidity range up to |η| < 2.5. The measurement reveals the strong suppression of charged hadron production in the most central collisions at a pT of about 7 GeV. A suppression of more than a factor of 2 is also measured at the upper edge of the analyzed pT range. The suppression does not show any strong η dependence.
Highlights
High pT hadrons are generally regarded to be produced through jet fragmentation, which has been successfully modeled using perturbative QCD
The energy loss of hard scattered partons traversing the hot and dense medium translates into a reduction in the yield of hadrons, measured as a ratio of yields per nucleon-nucleon interactions in head-on heavy ion collisions to those measured in p+p collisions [1, 2]
In this case the RCP is defined as the ratio of yields measured in central collisions to the yield measured in peripheral collisions, both scaled by the corresponding numbers of binary nucleon-nucleon collisions [3]
Summary
High pT hadrons are generally regarded to be produced through jet fragmentation, which has been successfully modeled using perturbative QCD. Even without equivalent protonproton data the ratio of yields can be studied as a function of centrality in the heavy ion collisions In this case the RCP is defined as the ratio of yields measured in central collisions to the yield measured in peripheral collisions, both scaled by the corresponding numbers of binary nucleon-nucleon collisions [3]. Study of the charged particle spectra at high pT provides an independent method to understand the jet quenching independent of any particular jet reconstruction algorithm. This analysis uses 4.36 × 107 minimum bias events (Lint ≈ 7μb−1) taken during the 2010 LHC lead-lead run and satisfying run and event cleaning selections. One containing 2.5 × 105 HIJING minimum bias events and one with
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