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T: Fachverband Teilchenphysik
T 21: Electroweak physics I
T 21.5: Vortrag
Montag, 30. März 2020, 17:30–17:45, L-3.016
Using impact parameter information for leptonic tau lepton decays in the measurement of the W→τν decay — •Nassim Ainouz1, Philipp König1, Matthias Schott2, Lennart Adam2, Jakub Kremer2, Philip Bechtle1, and Klaus Desch1 — 1Rheinische Friedrich-Wilhemls-Universität Bonn — 2Johannes Gutenberg Universität Mainz
The measurement of the mass of the W-Boson from the ATLAS experiment has been a highly acknowledged result in the past year. It’s the most precise single measurement of the W-mass which has been studied in leptonic final states. The SM predicts an equal coupling of the W-Boson to the different lepton flavours, leading to only a small difference in the branching ratios due to the different masses. The presented analysis follows a new approach to look at lepton universality by considering the ratio BR(W→τντ→µνµντντ)/BR(W→µνµ) as many systematic uncertainties cancel. Any deviation from the SM value could hint at new physics.
To further increase the sensitivity, we aim to make use of the life time of the tau lepton resulting in a given decay length. The measurement of the impact parameter and its correct calibration in Z->ll events is a crucial task to use it in the final measurement.