Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 32: QCD (Exp.) 1

T 32.8: Vortrag

Dienstag, 22. März 2022, 18:00–18:15, T-H17

Differential cross section for Zγ+jets using the ATLAS detector — •Vincent Goumarre — Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany

Differential measurements of the production of Zγ bosons in association with jet activity in pp collisions at √s=13 TeV are presented in this work, using the full Run2 dataset of 139fb⁻¹ collected by the ATLAS detector at the LHC.

Jet activity is a crucial point to study since differential distributions can help constrain important Standard Model (SM) parameters and calibrate models used in inputs in other observables, such as PDFs functions. Moreover, due to the possibility to fully reconstruct the final state, and a large cross section with a small background, Zγ is a good candle to test beyond the SM physic, with models such as ALPs or anomalous gauge couplings.

Distributions are measured in a fiducial space with transverse momentum of the photon greater than 30 GeV and considering only events where the Z-boson decays leptonically. The sum of the dilepton invariant mass and the dilepton plus photons invariant mass has to be greater than 182 GeV to suppress final state radiation.