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Description
The LHC has not yet revealed an unambiguous sign of beyond the Standard Model physics. But tensions observed by the LHCb, BaBar and Belle experiments in b->sll transitions are cause for a lot of excitement in the flavour physics community, as they might point towards lepton flavour and universality violation. To help shed light on the origin of these anomalies, decays involving tau leptons will play an important role. The LHCb group at CPPM is taking a leading role in these analyses, which are challenging to study in a busy hadronic environment like the LHC.
In this seminar I will present the search for the rare decay Bs->tautau, where both tau leptons are reconstructed into their three-prong final state. To cope with the abundant pion background at the LHC, custom isolation variables and reconstruction techniques were developed by the CPPM/CPT groups to suppress this background, enabling us to set a first limit on the Bs->tautau branching ratio and improve on the previous BaBar limit on Bd->tautau.
