Aachen 2019 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 88: Flavorphysik III

T 88.5: Vortrag

Donnerstag, 28. März 2019, 17:05–17:20, S15

Search for the Lepton Flavour Violating decay B_s⁰→ φ e^±µ^∓ — •Jan-Marc Basels, Andreas Güth, Christoph Langenbruch, and Stefan Schael — I. Physikalisches Institut B, RWTH Aachen University, Germany

In the Standard Model (SM) of particle physics the coupling of gauge bosons to leptons is independent of their flavour, which is known as lepton flavour universality. Thus, the branching fraction ratios R_h of rare semileptonic B decays, defined as R_h = B(B → h µ⁺ µ⁻ )/B(B → h e⁺ e⁻), are precisely predicted to be unity in the SM. The most precise measurements of the R_h ratios so far are performed by the LHCb experiment showing deviations of up to 2.6 standard deviations (σ) from the SM prediction. Lepton flavour non-universality would generally imply lepton flavour violation, which could be explained by several theories beyond the SM.
This talk will present the analysis strategy of a search for the lepton flavour violating decay B_s⁰→ φ e^±µ^∓ with particular focus on the study and control of backgrounds.