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T: Fachverband Teilchenphysik

T 6: Elektroschwache Wechselwirkung 1

T 6.1: Talk

Monday, March 24, 2014, 11:00–11:15, P6

Analysis of the Muon Pair Forward-Backward Asymmetry at the Belle Experiment — •Torben Ferber for the Belle collaboration — DESY, Notkestr. 85, 22607 Hamburg

The Belle detector was operated at the asymmetric electron-positron collider KEKB in Tsukuba, Japan, between 1999 and 2010. Being designed as a so-called B-Factory, its center-of-mass energy was in the range of the Υ resonances, with the bulk of the data taken at Υ(4S) (10.58 GeV). The large available data sample of more than one billion muon pairs at Belle allows precision tests of the electroweak theory at energies below the Z-pole. The Standard Model predicts interference effects between gamma and Z-boson exchange in fermion pair production which cause a forward-backward charge asymmetry A_FB. This asymmetry is related to the weak mixing angle sin²(θ_W) and is energy dependent in the SM. Any deviations from the predicted energy dependency hint to New Physics. Within this talk, the current status of the analysis of the muon pair charge asymmetry will be presented.