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T: Fachverband Teilchenphysik
T 94: Flavour Physics VI
T 94.1: Vortrag
Freitag, 4. April 2025, 09:00–09:15, VG 1.104
Test of Lepton Flavour Universality with Λb0 → pK−ℓ+ℓ− decays at LHCb — Johannes Albrecht1, Vitalii Lisovskyi2, and •Jannis Speer1 — 1TU Dortmund University, Dortmund, Germany — 2CPPM, Marseille, France
Rare decays mediated by b → s ℓ+ℓ− transitions provide a diverse range of probes for the SM. These include null tests of fundamental principles of the SM, such as lepton flavour universality (LFU), which asserts that the gauge bosons couple equally to all three generations of leptons.
The LHCb experiment has performed several measurements of LFU in rare decays, most prominently the ratio of branching fractions between b-meson decays with electrons and muons in the final state.
LFU can also be studied in rare b-baryon decays, which are affected by partly orthogonal experimental and theoretical uncertainties.
The first measurement of the ratio of branching fractions of the decays Λb0 → pK− e+e− and Λb0 → pK− µ+µ−, RpK−1, was performed by the LHCb collaboration using pp 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 updated measurement of RpK−1 aims to minimize the uncertainties by using the full 9 fb−1 LHCb pp dataset and implementing enhanced analysis techniques.
This contribution provides an update on the current progress of the ongoing analysis.
Keywords: LHCb; Rare Decays; LFU; Lepton Flavour Universality; Electroweak Penguins