Mr Felix Socher (Institut für Kern- und Teilchenphysik, Dresden)
Measurements of the cross sections of the production of pairs of electroweak gauge bosons at the LHC constitute stringent tests of the electroweak sector of the Standard Model and provide a model-independent means to search for new physics at the TeV scale. The ATLAS collaboration has performed measurements of integrated and differential cross sections of the production of WW and WZ pairs in both fully leptonic and semi-leptonic final states, both at 8 TeV and 13 TeV collision energy. These measurements are compared to predictions at up to NNLO+NNLL in pQCD. First integrated measurements of the WW and WZ pair production cross sections using fully leptonic final states at 13 TeV using data corresponding to 3.2 /fb are presented. Detailed studies of integrated and differential cross sections have been performed using data corresponding to 20.3 /fb at a centre-of-mass energy of 8 TeV. The measurements are performed as a function of hadronic jet multiplicity, a variety of kinematic variables calculated from the leptons and for the case of the WZ events also for the ratio of W+Z over W-Z events. Semi-leptonic final states are used to complement studies at higher transverse momentum of the vector bosons. Constraints on new physics are provided by setting limits on anomalous triple gauge couplings for charged vector bosons.
Dr Elizaveta Shabalina (University of Gottingen)