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SUMMARY:Mind the (semileptonic) gap: Understanding flavor anomalies at Bel
 le II
DTSTART:20261007T193000Z
DTEND:20261007T213000Z
DTSTAMP:20261014T184000Z
UID:indico-event-10773@indico.slac.stanford.edu
DESCRIPTION:Speakers: Philipp Horak (University of Victoria)\n\nSeveral me
 asurements in flavor physics currently deviate from Standard Model expecta
 tions. Measurements of the lepton universality ratios R(D(*)) and newer r
 esults such as the B -> K nu nu excess seen at Belle II show tensions on 
 the 3-4 sigma level\, while inclusive and exclusive determinations of |Vc
 b| and |Vub| have disagreed with each other for more than two decades. Th
 ese tensions are often discussed as possible signs of new physics\, but pe
 rhaps there is an equally plausible explanation. Both the R(D(*)) and the
  |Vcb|\, |Vub| puzzles rely on our description of the hadronic system in 
 semileptonic B decays\, and an incomplete description might result in ten
 sions. In this talk I will discuss how Belle II is addressing these questi
 ons. I will start by recapping the most precise |Vcb|\, |Vub| determinati
 ons to date\, as well as the most recent measurements of R(D(*)). I will 
 then turn to the inputs that are currently limiting. The sum of measured 
 exclusive b -> c l nu modes falls short of the inclusive rate\, and this g
 ap enters background models for R(D(*)) as well as inclusive |Vcb| extrac
 tions. I will present a first search for B-> D eta l nu as a candidate ga
 p mode\, and a model-independent approach that reconstructs the gap shape
  from measured inclusive moments through the Hausdorff moment problem. Fi
 nally\, I will present a new hybrid model for B -> Xu l nu based on optima
 l transport\, which aims to combine nonresonant modelling with hadronizat
 ion in a novel and improved way. I will close with the open questions whe
 re input from theory would help most.\n\nhttps://indico.slac.stanford.edu/
 event/10773/
LOCATION:48/2-224 - Madrone (SLAC)
URL:https://indico.slac.stanford.edu/event/10773/
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