SMuK 2023 – scientific programme
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T: Fachverband Teilchenphysik
T 77: Flavor VI
T 77.1: Talk
Wednesday, March 22, 2023, 17:30–17:45, HSZ/0401
Studies of lepton universality with Λb → pK l+l− decays at LHCb — Johannes 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 b → s ℓ+ℓ− 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 Λb → pK e+e− and Λb → pK 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.