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T: Fachverband Teilchenphysik
T 30: Flavor physics: Lepton universality tests II
T 30.2: Vortrag
Dienstag, 31. März 2020, 17:15–17:30, H-HS XIII
Search for the Lepton Flavour Violating decay Bs0→ φ µ±e∓ — •Jan-Marc Basels, Andreas Güth, Christoph Langenbruch, and Stefan Schael — I. Physikalisches Institut B, RWTH Aachen
In the Standard Model (SM) of particle physics the conservation of the lepton flavour quantum numbers in interactions involving charged leptons is a fundamental principle. Thus, every discovery of lepton flavour violation (LFV) would simultaneously be a discovery of new physics.
Designed to study heavy flavour decays, the LHCb detector at the LHC at CERN allows for the search of LFV in the decays of B hadrons with unprecedented sensitivity. An additional motivation to explore LFV signatures is given by recent tests of lepton flavour universality (LFU) in B decays, which have shown individual tensions with the SM prediction. These tests studied the branching fraction ratios Rh of rare semi-leptonic B decays, defined as Rh = B(B → h µ+ µ− )/B(B → h e+ e−) SM= 1. The flavour-changing neutral-current processes are forbidden at tree-level and can only occur in electroweak loop diagrams, making b → sℓ+ℓ− transitions sensitive to contributions from heavy particles beyond the SM. Lepton flavour non-universality would generally imply lepton flavour violation.
This talk presents the status of a search for the lepton flavour violating decay Bs0→ φ µ±e∓, based on data taken with the LHCb detector. Particular focus is placed on the study and control of backgrounds, as well as on efficiency estimations from Monte Carlo simulations.