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Karlsruhe 2024 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 102: Flavour physics 4

T 102.2: Vortrag

Donnerstag, 7. März 2024, 16:15–16:30, Geb. 30.41: HS 4

Measurement of the isospin asymmetry in BK*µ+µ decays with LHCbJohannes Albrecht1, Fabio De Vellis1, Christoph Langenbruch2, Vitalii Lisovskyi3, Biljana Mitreska1, •Thomas Oeser4, and Stefan Schael41Technische Universität Dortmund — 2Universität Heidelberg — 3EPFL — 4RWTH Aachen

Precision measurements of rare bsℓℓ 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 AI between B0K*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 BK*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

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