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T: Fachverband Teilchenphysik
T 26: Flavor III
T 26.4: Vortrag
Dienstag, 21. März 2023, 17:45–18:00, HSZ/0401
Isospin asymmetry in B → K µ+ µ− decays — Johannes Albrecht, •Fabio De Vellis, Vitalii Lisovskyi, and Biljana Mitreska — TU Dortmund University, Dortmund, Germany
Isospin symmetry is a fundamental property of the Standard Model. It predicts a branching fraction that is almost the same for decays which differ only by one spectator quark, like B0 → K0 µ+ µ− and B+ → K+ µ+ µ−. For these decays a quantity which describes differences in branching fraction, namely the asymmetry, can be defined. This is particularly convenient since it is theoretically clean and it allows to cancel some experimental uncertainties.
Previous measurements on these decays from LHCb and Belle, despite being compatible with expectations, suggested coherent deviations that could be interpreted as statistical fluctuations, or unaccounted theoretical uncertainties, or as a sign of New Physics. In this talk an update of the asymmetry measurement with the full LHCb dataset is presented. This means that data corresponding to an integrated luminosity of 6 fb−1 are added to the dataset used in the previous Run 1 analysis. Particular attention is given to the new strategy adopted to calibrate simulation samples to data.