Measurement of high-p[subscript T] azimuthal anisotropy in charged hadron production from 2.76 Tev PbPb collisions at CMS

Abstract

Measurements of the azimuthal anisotropy of charged hadrons are presented for PbPb collisions at √s[subscript NN] = 2.76 TeV over an extended transverse momentum range. The data were collected with the CMS detector at the LHC. The anisotropy parameter (v[subscript 2]) is extracted up to a significantly higher p[subscript T] region than previously achieved, by correlating charged tracks with respect to the event plane reconstructed using the energy deposited in forward-angle calorimeters. These new data can impose quantitative constraints on the details of in-medium parton energy loss models, particularly the influence of the path length and the shape of the interaction region.