SMuK 2023 – scientific programme

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T: Fachverband Teilchenphysik

T 26: Flavor III

T 26.1: Talk

Tuesday, March 21, 2023, 17:00–17:15, HSZ/0401

Multi-lepton B decays within the Standard Model and their impact on LHCb analysis — Johannes Albrecht, Emmanuel Stamou, Vitalii Lisovskyi, and •Jan Peter Herdieckerhoff — TU Dortmund University, Dortmund, Germany

Rare flavour-changing neutral current decays of hadrons to multi-lepton final states are sensitive probes of the Standard Model and thus among the target measurements at LHCb. A reliable Standard Model prediction of their rates is an essential input for the realistic simulation within the LHCb analyses and even more so when analysing decays with non-trivial angular and q² dependence.

One such analysis is the most recent search of B_(s)⁰ → µ⁺ µ⁻ µ⁺ µ⁻ performed by the LHCb experiment and published in 2022. The main systematic uncertainty in this search comes from the missing Standard Model prediction. So far, only a simplified phase-space approach was used to simulate signal candidates in the LHCb analysis.

In this talk, we present the computation and results of the Standard Model prediction of the decay B_s⁰ → µ⁺ µ⁻ µ⁺ µ⁻, and its implementation in the simulation framework EvtGen. The impact of this calculation on the LHCb analysis is also evaluated.