Heidelberg 2022 – scientific programme

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T: Fachverband Teilchenphysik

T 57: Flavour Physics 5

T 57.1: Talk

Wednesday, March 23, 2022, 16:15–16:30, T-H16

Search for B_(s)⁰→ ppµ⁺µ⁻ decays with the LHCb experiment — Johannes Albrecht, •Maik Becker, Lukas Calefice, and Vitalii Lisovskyi — Experimentelle Physik 5, TU Dortmund

In 2019 the LHCb collaboration reported the first observation of the decays B_(s)⁰→ J/ψ pp. The branching fraction of the B_s⁰ mode was measured to be (3.6±0.4)×10⁻⁶, which was much larger than the theoretically expected value of O(10⁻⁹) at that time. For the B⁰ mode, however, the branching fraction was in agreement with theoretical predictions.

The question arises whether the corresponding non-resonant decays are also observable with the full data set of 9 fb⁻¹ collected by the LHCb experiment. For the B_s⁰ mode the leading-order Feynman diagram is similar to the one for the B_s⁰→µ⁺µ⁻ decay, but includes an additional pp pair from gluon radiation, lifting the helicity suppression. For the B⁰ mode Cabibbo-suppressed b→ dµ⁺µ⁻ transitions dominate.

In this talk an ongoing analysis of B_(s)⁰→ ppµ⁺µ⁻ decays using data from the LHCb experiment will be presented. In particular, the selection and studies on the resonant control channels are shown. The search aims at intensifying the efforts of the LHCb collaboration to study rare decays with leptons and baryons in the final state.