Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 40: Flavorphysik I

T 40.1: Talk

Tuesday, March 26, 2019, 16:00–16:15, S15

Search for the Rare Decay B → µ ν with the Belle Experiment — •Markus Prim, Florian Bernlochner, Michael Feindt, and Pablo Goldenzweig — ETP, KIT, Karlsruhe

The Belle experiment at the Japanese research facility KEK recorded a data sample of 772 million BB decays of the Υ(4S) resonance. Studying rare modes of these B mesons is interesting, because the influence of new physics on the branching ratios can be large. One such rare decay, which is helicity suppressed in the Standard Model, is the leptonic decay B → µ ν, with a muon and a muon-neutrino in the final state. We present the result of the search for this decay with an inclusive reconstruction of the tag B, with an emphasis on the calibration of the inclusive tag and an improved background modeling of B → X_u l ν processes. In addition, the search for a heavy sterile neutrino with the same final state is presented.