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T: Fachverband Teilchenphysik
T 9: Flavor physics: Lepton universality tests I
T 9.1: Vortrag
Montag, 30. März 2020, 16:30–16:45, H-HS X
Rare baryonic decays and lepton universality tests at LHCb — •Vitalii Lisovskyi and Johannes Albrecht — Experimentelle Physik 5, TU Dortmund
Flavour-changing neutral-current b → s ℓ+ ℓ− transitions are forbidden at tree level in the Standard Model (SM), and can only occur at loop level. Therefore, they are sensitive to potential New Physics (NP) effects. In the SM, the transitions b → s e+ e− and b → s µ+ µ− have the same probability to happen, this property is called lepton universality (LU). Probing LU in b-hadron decays is considered as a promising area for NP searches. In particular, tensions at the level of about 2.5 standard deviations with respect to the SM predictions have been observed in rare B→ K(*) ℓ+ ℓ− decays.
This talk presents a first test of the LU in rare decays of b baryons, namely Λb0 → pK ℓ+ ℓ−, using the data collected by the LHCb experiment. The decay Λb0 → pK e+ e− is observed for the first time, which allows to test LU with about 15% precision. The analysis approach, its main challenges and potential future improvements are discussed.
Furthermore, prospects for studies of rare decays of the Λb0 and heavier b baryons at the LHCb experiment are discussed.