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T: Fachverband Teilchenphysik

T 11: QCD / Partonstruktur

T 11.2: Vortrag

Montag, 19. März 2018, 16:15–16:30, Z6 - SR 1.002

Measurement of observables sensitive to the underlying event in inclusive Z boson production at a centre of mass energy of 13 TeV with the ATLAS detector — •Lennart Adam — Institut für Physik, Staudingerweg 7, 55128 Mainz

This talk will summarize a full measurement of observables sensitive to the underlying event in proton- proton collisions at a centre-of-mass energy of 13 TeV. It is based on a data set collected during 2015 with the ATLAS detector at the Large Hadron Collider. The underlying event refers to all processes of a single proton-proton interaction which are not attributed to the hard scattering process. It is a background to all hadron collider experiments. Thus, a precise modelling of the underlying event is crucial to precision measurements, such as of the W boson mass. The analysis presented here evaluates the accuracy of recent MC models in simulating the underlying event. In order to measure the overall activity of the underlying event, the charged particle mul- tiplicity, the sum of transverse momenta and the general pt-spectra of cherged particles are investigated. The observables are measured as a function of the hard scatter process represented by the creation of a Z boson subsequently decaying into a muon pair. A dedicated discussion of systematic uncertainties, e.g. pile-up effects, is included.