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Seminars
Investigating the polarisation puzzle with B0(s) -> K*K* decays at LHCb
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Europe/London
Bohr Conference Room
Bohr Conference Room
Description
Charmless decays of a B meson to two vector particles offer many different avenues to explore the Standard Model. There has been a longstanding discrepancy between experimental measurements of the longitudinal polarisation fractions in charmless B->VV decays, both between the experimental measurements of different decays and with SM predictions, which has been dubbed the “polarisation puzzle”.
In this talk, I will present results from a recent LHCb analysis (https://arxiv.org/abs/2512.05102), updating branching fraction and polarisation fraction measurements in both Bd and Bs decays to a Kstar Kstarbar final state, resulting in a 4.4 sigma tension between theory and experiment.
In this talk, I will present results from a recent LHCb analysis (https://arxiv.org/abs/2512.05102), updating branching fraction and polarisation fraction measurements in both Bd and Bs decays to a Kstar Kstarbar final state, resulting in a 4.4 sigma tension between theory and experiment.