Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 5: Electroweak Interactions (Exp.) 1

T 5.4: Vortrag

Montag, 21. März 2022, 17:05–17:20, T-H18

Measurement of the differential W→ e+ν cross-section at high transverse masses at √s=13 TeV with the ATLAS detector — Frank Ellinghaus and •Frederic Schröder — Bergische Universität Wuppertal

The charged-current Drell-Yan (DY) cross-section is measured for the leptonic decay of the W boson W→ e ν. While the cross-section at the peak of the W boson mass is known very well, the measurement of the differential cross-section for transverse masses up to O(1 TeV) is measured for the first time. In addition, the double-differential cross-section will be measured as a function of the transverse mass of the W boson and the pseudorapidity of the lepton.
The charged-current DY can be used to constrain the density function that describes the partonic content of the proton and to measure fundamental parameters of the Standard Model. In particular, the high m_T^W region of the charged-current DY allows probing new physics by constraining effective field theory parameters, because these parameters are sensitive to small deviations in the cross-section with respect to the theory prediction.
An overview of the cross-section measurement focused on issues related to the reconstruction of the missing transverse momentum in the fake lepton background estimation will be presented. The data has been taken at the ATLAS experiment during Run-2 based on pp-collisions at a center-of-mass energy of √s=13 TeV at the LHC.