Physics
Scientific paper
Mar 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..aprd10002z&link_type=abstract
American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #D10.002
Physics
Scientific paper
The CMS experiment has measured the azimuthal anisotropy of charged hadrons over a very broad transverse-momentum range in PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV and for multiple collision centralities. The second order Fourier coefficient, v2, is extracted by correlating charged tracks with the event plane reconstructed using the energy deposited in the forward-angle calorimeters. Utilizing the broad coverage of the CMS calorimetry at the very forward region, contamination from back-to-back dijets is significantly suppressed. The observed azimuthal anisotropy in the high-pt regime provides important constraints on the path-length dependence of parton energy loss.
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