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SMuK 2023 – scientific programme

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T: Fachverband Teilchenphysik

T 26: Flavor III

T 26.2: Talk

Tuesday, March 21, 2023, 17:15–17:30, HSZ/0401

Tests of muon-electron universality at the LHCb experiment — •Alex Seuthe and Johannes Albrecht — TU Dortmund University, Dortmund, Germany

The LHCb experiment at the Large Hadron Collider (LHC) is specialised in high-precision measurements of flavour physics with hadrons containing b and c quarks. Tests of lepton flavour universality are a sensitive and clean way to probe the Standard Model of particle physics. Any deviations from this universality would be a clear sign of new physics. In this talk, I will present the first simultaneous test of muon-electron universality using the full LHCb Run 1 and Run 2 dataset with the observables RK* and RK. These observables are defined as ratios of the branching fractions of the decays B0K*0 µ+ µ and B0K*0 e+ e, and B+K+ µ+ µ and B+K+ e+ e, respectively. This result is the most sensitive test of lepton flavour universality with rare b decays to date.

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