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T: Fachverband Teilchenphysik

T 31: Elektroschwache Physik 3

T 31.5: Talk

Thursday, March 7, 2013, 17:45–18:00, GER-037

Analysis of the Muon Pair Forward-Backward Asymmetry at the Belle Experiment — Wulfrin Bartel, Torben Ferber, Claus Kleinwort, Carsten Niebuhr, •Kim Susan Petersen, Armine Rostomyan, Michael Steder, and Sergey Yaschenko — Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany

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 Y resonances, with the bulk of the data taken at Y(4S) (10.58 GeV).

The large available data sample at Belle allows precision tests of electroweak predictions 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 behaviour hint to New Physics. Within this talk, the current status of the analysis of the muon pair charge asymmetry will be presented.