Doctor Dissertation Defense - Vanessa Gaultney Werner
Abstract: The study of the angular distribution of photon plus jet events in pp collisions at √s = 7 TeV with the Compact Muon Solenoid (CMS) detector is presented. The photon is restricted to the central region of the detector (|| < 1.4442) while the jet is allowed to be present in both central and forward regions of CMS (|| < 2.4). Dominant backgrounds due to jets fragmenting into neutral mesons are accounted for through the use of a template method that discriminates between signal and background. The angular distribution, |*|, is defined as the absolute value of the difference in between the leading photon and leading jet in an event divided by two. The angular distribution ranging from 0-1.4 is examined and compared with next-to-leading order QCD predictions and is found to be in good agreement.