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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)0ppµ+µ decays with the LHCb experimentJohannes 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)0Jpp. The branching fraction of the Bs0 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 Bs0 mode the leading-order Feynman diagram is similar to the one for the Bs0→µ+µ decay, but includes an additional pp pair from gluon radiation, lifting the helicity suppression. For the B0 mode Cabibbo-suppressed bdµ+µ transitions dominate.

In this talk an ongoing analysis of B(s)0ppµ+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.

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