Heidelberg 2022 – scientific programme

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T: Fachverband Teilchenphysik

T 57: Flavour Physics 5

T 57.5: Talk

Wednesday, March 23, 2022, 17:15–17:30, T-H16

Probing multilepton decays with the LHCb experiment — Johannes Albrecht and •Vitalii Lisovskyi — Experimentelle Physik 5, TU Dortmund

In the recent years, a number of tensions has been observed in rare decays of B hadrons to a lighter hadron and two leptons. With the large dataset collected by the LHCb experiment, it becomes possible to study even higher-order processes. For instance, in the Standard Model, radiation of a virtual photon from the initial state or the final state can create an additional dilepton pair, leading to a final state with four leptons. In theories beyond the Standard Model, there are alternative mechanisms to reach such final state, which makes such decays excellent probes in searches for New Physics. In this talk, decays of beauty hadrons and quarkonia to final states with four leptons will be discussed. In particular, a search for the decay B⁺ → K⁺ µ⁺µ⁻µ⁺µ⁻ with the dataset collected by the LHCb experiment will be presented. I will discuss the experimental challenges and sources of background, as well as estimate the expected sensitivity.