Measurement of the Z <tex>$\gamma$</tex> production cross section in pp collisions at 8 TeV and search for anomalous triple gauge boson couplingsMeasurement of the Z <tex>$\gamma$</tex> production cross section in pp collisions at 8 TeV and search for anomalous triple gauge boson couplings
Faculty of Sciences. Physics
Elementary Particle Physics
Journal of high energy physics. - Bristol
(2015):4, 40 p.
University of Antwerp
The cross section for the production of Z gamma in proton-proton collisions at 8 TeV is measured based on data collected by the CMS experiment at the LHC corresponding to an integrated luminosity of 19.5 fb(-1). Events with an oppositely-charged pair of muons or electrons together with an isolated photon are selected. The differential cross section as a function of the photon transverse momentum is measured inclusively and exclusively, where the exclusive selection applies a veto on central jets. The observed cross sections are compatible with the expectations of next-to-next-to-leading-order quantum chromodynamics. Limits on anomalous triple gauge couplings of ZZ gamma and Z gamma gamma are set that improve on previous experimental results obtained with the charged lepton decay modes of the Z boson.