Measurement of the semitauonic decay B0 -> D*- tau+ nu at LHCb

by Brian Hamilton (University of Maryland (US))

Tuesday 30 Jun 2015, 11:00 → 12:00 Europe/Zurich

222/R-001 (CERN)

Semileptonic b decays to tau leptons provide a powerful probe for violations of charged lepton universality due to physics beyond the standard model. In particular, new particles with Higgs-like enhanced couplings to the third generation fermions may induce large deviations from the well-understood standard model expectations. The decay rates for these processes remain poorly measured compared to the corresponding processes involving the light leptons, and tantalizing but inconclusive hints of a deviation from the Standard Model have been reported. A new measurement of the ratio of branching fractions R(D*)=B(B0 -> D*- tau+ nu)/B(B0 -> D*- mu+ nu) using the LHCb Run 1 dataset is presented, where the tau is selected in the tau+ -> mu+ nu anti-nu decay mode. This is the first measurement of a b -> X tau nu process at a hadron collider.

Recording

Poster CERNLHCSeminar30.06.2015.pdf

Slides hamilton-LHC-seminar-2.pdf