Particle-yield modification in jetlike azimuthal dihadron correlations in Pb-Pb collisions at root S-NN=2.76 TeV

Abstract

The yield of charged particles associated with high- p t trigger particles ( 8 < p t < 15 GeV / c ) is measured with the ALICE detector in Pb-Pb collisions at √ s NN = 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.