Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 102: Flavour physics 4

T 102.2: Talk

Thursday, March 7, 2024, 16:15–16:30, Geb. 30.41: HS 4

Measurement of the isospin asymmetry in B→ K^*µ⁺µ⁻ decays with LHCb — Johannes Albrecht¹, Fabio De Vellis¹, Christoph Langenbruch², Vitalii Lisovskyi³, Biljana Mitreska¹, •Thomas Oeser⁴, and Stefan Schael⁴ — ¹Technische Universität Dortmund — ²Universität Heidelberg — ³EPFL — ⁴RWTH Aachen

Precision measurements of rare b→ sℓℓ transitions, which are forbidden at tree level in the Standard Model (SM) and can only occur via loop-level and higher-order processes, constitute clean tests of the SM, sensitive to various potential New Physics contributions.

The isospin asymmetry A_I between B⁰→ K^*0µ⁺µ⁻ and B⁺→ K^*+µ⁺µ⁻ has a very clean SM prediction as many hadronic uncertainties cancel in the calculation. Previous measurements are in agreement with this prediction, within still large uncertainties.

This talk presents an overview of the analysis of the isospin asymmetry in B→ K^*µ⁺µ⁻ and the differential branching fraction of B⁺→ K^*+µ⁺µ⁻ using the full LHCb Run 1 and Run 2 dataset, recorded between 2011 and 2018 and corresponding to an integrated luminosity of approximately 9fb⁻¹.

Keywords: LHCb; Rare Decays; Electroweak Penguins; Branching fractions