SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 77: Flavor VI

T 77.1: Vortrag

Mittwoch, 22. März 2023, 17:30–17:45, HSZ/0401

Studies of lepton universality with ΛbpK l+l decays at LHCbJohannes Albrecht, Vitalii Lisovskyi, and •Jannis Speer — TU Dortmund University, Dortmund, Germany

In recent measurements of b-hadron decays, a pattern of consistent tensions with the Standard Model predictions is observed. This includes rare decays with bs+ transitions, which play an important role in lepton flavor universality tests. Complementary to b-meson decays, lepton flavor universality can also be tested in b-baryon decays, which come with partly orthogonal experimental uncertainties. The first measurement of the ratio of branching fractions of the decays ΛbpK e+e and ΛbpK µ+µ, RpK−1, was published by the LHCb Collaboration using proton-proton collision data corresponding to an integrated luminosity of 4.7   fb−1. The ratio was measured to be RpK−1 = 1.17 +0.18
−0.16 ± 0.07 in the dilepton mass-squared range 0.1 < q2 < 6.0   GeV2/c4 and the pK mass range m(pK) < 2600   MeV/c2. The legacy measurement of RpK−1 aims to reduce the uncertainties by analyzing the full 9   fb−1 dataset of LHCb experiment and implementing new selection techniques. In this talk, the recent developments of the ongoing measurement are presented.

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