Analysis of the production of Z plus gamma in proton-proton collisions at s = 7 TeV and s = 8 TeV with the CMS experiment at the LHC

TL;DRAbstract

This thesis presents the measurement of the Z plus photon production in proton proton collisions at the LHC with the CMS experiment. Z-bosons decaying into a pair of muons (µ+ µ- ) or electrons (e+ e- ) are considered. The basis of this analysis are 5 fb-1 of data collected in 2011 at a proton-proton collision energy of 7 TeV and 19.5 fb-1 collected in 2012 at 8 TeV. These high integrated luminosities allow a precision measurement at energies that have not been reached before. Measurements of the inclusive fiducial cross section as a function of the transverse momentum of the photon are presented at both energies, as well as a measurement of the exclusive cross section, i.e., without additional jets, at 8 TeV. The crucial point in this analysis is the background estimation of indirectly produced photons, e.g., in decays of pi0, or other particles faking a photon-like signature in the detector. Here the template method is used. Signal templates can directly be taken from data by selecti

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