Hamburg 2016 – scientific programme

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T: Fachverband Teilchenphysik

T 58: Elektroschwache Wechselwirkung (Experiment) I

T 58.6: Talk

Tuesday, March 1, 2016, 18:00–18:15, VMP8 SR 206

Cross section measurement of Z boson pair production with the ATLAS at √s=13 TeV: Background determination and correction for detector effects — •Maurice Becker and Stefan Tapprogge — Institute of Physics, Mainz, Germany

One of the predictions that the electroweak sector of the Standard Model gives, is the production of two Z bosons. This process is not only a background contribution of many analysis that are done at the LHC, a measurement of the cross section of the process can also used for constraints on the theoretical modeling of the process and used to search for phenomena beyond the Standard Model (e.g. anomalous triple gauge couplings).
An overview of the first ZZ cross section measurement with 3.3 fb⁻¹ of data that were taken with the ATLAS detector in 2015 at √s=13 TeV is presented. The measurement is done requiring two on shell Z bosons using only leptonic final states with ℓ=e,µ due to the low background contribution in this decay channel. The focus is set on the determination of background that arises from mis-identified electrons or muons from secondary decay vertices. Since this background is difficult to model, a data driven approach is chosen. Furthermore the corrections for detector effects are presented which are used to extract the measured cross section in the chosen fiducial region.