Very High-pT Triggered Dihadron Correlations in PbPb Collisions at 2.76 TeV with CMS

Measurements of dihadron correlations triggered by very high-pT particles in 2.76 TeV PbPb collisions are shown. The analysis explores the full 2011 PbPb data set corresponding to an integrated luminosity of 150 ub collected by CMS. Long-range correlations driven by single-particle azimuthal anisotropies (characterized by the Fourier harmonics, $v_{n}$) are measured up to a pT of 50 GeV/c. After subtracting the v2-v4 harmonic components, the associated particle yields on the near and away side of the residual jet-like dihadron correlations are studied over a wide kinematic range in trigger and associated particle pT, as a function of collision centrality. By comparing to pp data at the same energy, a suppression of about 50% in the away-side associated yield is observed for the associated particle pT greater than 3 GeV/c. The yield is found to be significantly enhanced up to a factor of 3-4 on the away side at an associated particle pT of about 0.5 GeV/c. A moderate enhancement is suggested on the near side.