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Particle-Yield Modification in Jetlike Azimuthal Dihadron Correlations in Pb-Pb Collisions at √sNN=2.76 TeV

The yield of charged particles associated with high-pt trigger particles (8<pt<15 GeV/c) is measured with the ALICE detector in Pb-Pb collisions at √sNN=2.76 TeV relative to proton-proton collisions at the same energy. The conditional per-trigger yields are extracted from the narrow jetlike correlation peaks in azimuthal dihadron correlations. In the 5% most central collisions, we observe that the yield of associated charged particles with transverse momenta pt>3  GeV/c on the away side drops to about 60% of that observed in pp collisions, while on the near side a moderate enhancement of 20%–30% is found.

ALICE; LHC; CERN; PbPb; 2.76 TeV; Azimuthal Dihadron Correlations; Yield Modification

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