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arXiv · 1208.6218

Measurement of charged particle R_AA at high pT in PbPb collisions at sqrt(sNN)=2.76 TeV with CMS

Krisztian Krajczar
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Abstract

Charged particle transverse momentum (pT) spectra have been measured by CMS for pp and PbPb collisions at the same sqrt(sNN)=2.76 TeV collision energy per nucleon pairs. Calorimeter-based jet triggers are employed to enhance the statistical reach of the high-pT measurements. The nuclear modification factor (R_AA) is obtained in bins of collision centrality for the PbPb data sample dividing by the measured pp reference spectrum. In the range pT = 5-10 GeV/c, the charged particle yield in the most central PbPb collisions is suppressed by up to a factor of 7. At higher pT, this suppression is significantly reduced, approaching a factor of 2 for particles with pT = 40-100 GeV/c.

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Krisztian Krajczar. 2012-08-30. Measurement of charged particle R_AA at high pT in PbPb collisions at sqrt(sNN)=2.76 TeV with CMS. https://doi.org/10.1016/j.nuclphysa.2012.12.048

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