Aachen 2019 – scientific programme
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T: Fachverband Teilchenphysik
T 63: Flavorphysik II
T 63.2: Talk
Wednesday, March 27, 2019, 16:15–16:30, S15
Probing lepton flavour universality with RKππ: Studies of the decay B+→ K+π+π−e+e− with the LHCb experiment — Johannes Albrecht, •Maik Becker, Stefanie Reichert, and Tobias Tekampe — Experimentelle Physik 5, TU Dortmund
The Standard Model of particle physics predicts universal couplings of gauge bosons to leptons, which can be tested by measuring the ratio of branching fractions of b→ sℓ+ℓ− decays with equal hadronic and different leptonic components in the final state. Results of recent measurements of this kind like RK or RK* show tensions with the Standard Model predictions.
The observable RKππ, defined as the ratio of the branching fractions of the decays B+→ K+π+π−e+e− and B+→ K+π+π−µ+µ−, is explored as a similar but fully independent probe.
In this talk the ongoing measurement of RKππ will be presented. A focus is set on studies of the final state with electrons.