Hamburg 2016 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 58: Elektroschwache Wechselwirkung (Experiment) I
T 58.2: Vortrag
Dienstag, 1. März 2016, 17:00–17:15, VMP8 SR 206
Measurement of the weak mixing angle from polarization of τ leptons produced in Z decays at CMS — •Vladimir Cherepanov, Günter Flügge, Bastian Kargoll, Wolfgang Lohmann, Alexander Nerhkorn, Ian .M Nugent, Claudia Pistone, Achim Stahl, and Alexander Zotz — III. Physikalisches Institut B, RWTH Aachen University, D-52056 Aachen
Measurements of the τ - lepton polarization and its forward-backward asymmetry at the Z0 resonance have been performed at LEP. The precision reached was limited by the statistical uncertainty. The LHC provides the opportunity to improve the precision and test the SM of electroweak interaction. An additional challenge at the LHC is the unknown center of mass energy of tau lepton pairs. We present an analysis on the full kinematic reconstruction of the process Z → ττ → a1ν µνν and a measurement of the τ - lepton polarization. The result is used to determine the electroweak mixing angle sin2θW.