Erlangen 2026 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 29: Flavour Physics II
T 29.5: Vortrag
Dienstag, 17. März 2026, 17:15–17:30, KH 01.011
Early measurement of rJ/ψK,K* with 2024 data — Johannes Albrecht1, Michele Atzeni2, Lukas Calefice3, Angel Fernando Campoverde Quezada4, James Gooding1, Carla Marin Benito5,3, •Lorenzo Nisi1, Renato Quagliani5, Alessandro Scarabotto1, Eluned Smith2, and Pol Vidrier Villalba3 — 1TU Dortmund University, Dortmund, Germany — 2Massachusetts Institute of Technology, Cambridge, United States — 3Universitat de Barcelona, Barcelona, Spain — 4University of Chinese Academy of Sciences, Beijing, China — 5CERN, Geneva, Switzerland
During 2024, the LHCb experiment collected more than 9 fb−1 of integrated luminosity for pp collisions, recording approximately as many collisions as between 2011 and 2018. The performance of the upgraded LHCb detector in Run 3 of the LHC must be fully understood to perform precise measurements with this new dataset.
Measurements of ratios between B meson decays to final states containing different lepton pairs can be used to study lepton flavour universality, e.g., RK,K* between B+(0) → K+(0*) µ+ µ− and B+(0) → K+(0*) e+ e− decays. The J/ψ → ℓ ℓ resonant modes are commonly used as control channels and their ratio rJ/ψK,K* is well-understood to be consistent with unity. As such rJ/ψK,K* can be used to validate detector performance and data-MC corrections.
This contribution presents the progress towards a measurement of rJ/ψK,K* using 2024 data.
Keywords: LHCb; Run 3; Rare Decays