Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 57: Flavour Physics 5
T 57.3: Vortrag
Mittwoch, 23. März 2022, 16:45–17:00, T-H16
Isospin asymmetries in rare B decays — Johannes Albrecht, •Fabio De Vellis, and Vitalii Lisovskyi — Experimentelle Physik 5, TU Dortmund
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−. The same is true for the decays B0 → K*0 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 systematics. 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 previous Run 1 analysis. This analysis also aims to give an update to the differential branching fraction measurement of the above-mentioned decays.