Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 4: Flavour Physics 2
T 4.4: Vortrag
Montag, 21. März 2022, 17:00–17:15, T-H17
Test of Lepton Flavour Universality (LFU) in Λb→Λℓℓ with the LHCb experiment — Flavio Archilli1, Simone Bifani2, Vlad Dedu3, Lex Greeven3, Sietske Keijzer3, Mick Mulder4, Niladri Sahoo2, Marco Santimaria5, Silvia Sole3, Paul Swallow2, Niels Tuning3, Maarten Veghel3, •Chishuai Wang1, and Nigel Watson2 — 1Physikalisches Institut, Heidelberg, Germany — 2University of Birmingham, UK — 3Nikhef, Netherlands — 4University of Groningen, Netherlands — 5INFN, Frascati, Italy
The Flavour Changing Neutral Current (FCNC) transition b→ sℓℓ is highly suppressed in the Standard Model (SM), which makes it susceptible to the impact of possible New Physics (NP).
In the SM, the electroweak interaction does not distinguish between the three generations of leptons. However, several recent studies of LFU using b→ sℓℓ processes, e.g. RK=B(B+→ K+µµ)/B(B+→ K+ee) and RK*0=B(B0→ K*0µµ)/B(B0→ K*0ee) measurements, have shown deviations from the SM expectations.These ratios have the advantage that theoretical uncertainties from the hadronization cancel, which makes them relatively clean observables. For the Λb→Λℓℓ system, a similar observable RΛ= B(Λb→Λµµ)/B(Λb→Λ ee) can be defined. The measurement of RΛ will provide an independent test with respect to the tests of LFU performed with the B-mesons.
This talk will present the ongoing study of the RΛ measurement at LHCb, using the data collected by the LHCb experiment during the years 2011-2012 and 2015-2018.