Hamburg 2016 – scientific programme
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T: Fachverband Teilchenphysik
T 100: Elektroschwache Wechselwirkung (Experiment) III
T 100.7: Talk
Thursday, March 3, 2016, 18:15–18:30, VMP8 SR 206
Measurement of Z boson production cross section in the dilepton channels and the ratio of tt to Z boson production cross sections in pp collisions at √s=13 TeV with the ATLAS detector — •Nataliia Zakharchuk — Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
A measurement of Z boson production cross sections σZ in pp collisions at a centre-of-mass energy √s=13 TeV is presented. Results are obtained in both Z→ µ µ and Z→ ee channels, based on data corresponding to an integrated luminosity of 3,3 fb−1 collected with the ATLAS detector at the LHC during the year 2015. The selection criteria of the measurement are optimized to be as close as possible to the measurement of the tt production cross section σtt, using the same data. This leads to a 13 TeV cancellation of the systematic uncertainties for the cross section ratio Rtt/Z13TeV=σtt/σZ. The experimental results are compared to the predictions of perturbative QCD calculations at next-to-next-to-leading orders using various sets of parton distribution functions.