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SUMMARY:Investigating the polarisation puzzle with B0(s) -> K*K* decays at
  LHCb
DTSTART:20261009T120000Z
DTEND:20261009T130000Z
DTSTAMP:20261101T052200Z
UID:indico-event-19104@indico.global
DESCRIPTION:Speakers: Matthew David Monk (University of Warwick (GB))\n\n\
 nCharmless decays of a B meson to two vector particles offer many differen
 t avenues to explore the Standard Model. There has been a longstanding dis
 crepancy between experimental measurements of the longitudinal polarisatio
 n fractions in charmless B->VV decays\, both between the experimental meas
 urements of different decays and with SM predictions\, which has been dubb
 ed the “polarisation puzzle”. In this talk\, I will present results fr
 om a recent LHCb analysis (https://arxiv.org/abs/2512.05102)\, updating br
 anching 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.\n\n\nhttps://indico.global/event/19104/
LOCATION:Bohr Conference Room
URL:https://indico.global/event/19104/
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