Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 4: Flavour Physics 2
T 4.1: Vortrag
Montag, 21. März 2022, 16:15–16:30, T-H17
Testing Lepton Flavour Universality with Bs0→ φ ℓ+ℓ− decays using LHCb data — Christoph Langenbruch1, Stefan Schael1, •Sebastian Schmitt1, and Eluned Smith2 — 1I. Phys. Inst. B - RWTH Aachen — 2University of Zürich
In the Standard Model of Particle Physics (SM), b → s ℓ+ℓ− transitions are forbidden at tree-level and may only occur at the loop-level. The branching fractions of these so-called Flavour Changing Neutral Currents (FCNCs) can thus be significantly affected by New Physics (NP) beyond the SM. While in the SM, the coupling of the electro-weak gauge-bosons is Lepton Flavour Universal (LFU), this universality can be broken in NP scenarios. Ratios of branching fractions of semileptonic rare decays with muons and electrons in the final state constitute clean SM tests. Recent measurements of LFU ratios have shown tensions of up to 3.1 σ.
The LHCb detector is located at the Large Hadron Collider (LHC) at CERN and is optimised to study rare b-hadron decays. For this purpose LHCb features high trigger efficiencies, excellent track reconstruction, and particle identification.
This talk gives an overview of the measurement of Rφ, which benefits from the experimentally clean Bs0 → φ ℓ+ℓ− environment. The analysis uses the full Run 1 and Run 2 dataset collected by LHCb which corresponds to 9 fb−1 of integrated luminosity.