Measurement of isolated photon production in pp and PbPb collisions at √{sNN} = 2.76 TeV
Abstract
Isolated photon production is measured in proton-proton and lead-lead collisions at nucleon-nucleon centre-of-mass energies of 2.76 TeV in the pseudorapidity range | η | < 1.44 and transverse energies ET between 20 and 80 GeV with the CMS detector at the LHC. The measured ET spectra are found to be in good agreement with next-to-leading-order perturbative QCD predictions. The ratio of PbPb to pp isolated photon ET-differential yields, scaled by the number of incoherent nucleon-nucleon collisions, is consistent with unity for all PbPb reaction centralities.
- Publication:
-
Physics Letters B
- Pub Date:
- April 2012
- DOI:
- 10.1016/j.physletb.2012.02.077
- arXiv:
- arXiv:1201.3093
- Bibcode:
- 2012PhLB..710..256C
- Keywords:
-
- CMS;
- Physics;
- Heavy-ions;
- Photons;
- Nuclear Experiment;
- High Energy Physics - Experiment
- E-Print:
- Submitted to Physics Letters B