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SUMMARY:Breakout room #1: Bayesian fit analysis to full distribution data 
 of B →D^(∗) ℓ ν : ∣Vcb∣ determination and new physics 
 constraints
DTSTART;VALUE=DATE-TIME:20201117T052000Z
DTEND;VALUE=DATE-TIME:20201117T070000Z
DTSTAMP;VALUE=DATE-TIME:20260425T223628Z
UID:indico-contribution-27@cern.ch
DESCRIPTION:Speakers: Mr. IGURO\, Syuhei (Nagoya University)\nWe 
 investigate the semi-leptonic decays of B→D^(∗)ℓν in terms of the 
 Heavy-Quark-Effective-Theory (HQET) parameterization for the form 
 factors\, which is described with the heavy quark expansion up to 
 O(1/m_c^2) beyond the simple approximation considered in the original CLN 
 parameterization. An analysis with this setup was first given in the 
 literature\, and then we extend it to the comprehensive analyses including
  (i) simultaneous fit of ∣Vcb∣ and the HQET parameters to available 
 experimental full distribution data and theory constraints\, and (ii) New 
 Physics (NP) contributions of the V_2 and T types to the decay 
 distributions and rates. For this purpose\, we perform Bayesian fit 
 analyses by using Stan program\, a state-of-the-art public platform for 
 statistical computation. Then\, we show that our ∣Vcb∣ fit results for
  the SM scenarios are close to the PDG combined average from the exclusive
  mode\, and indicate significance of the angular distribution data. In 
 turn\, for the SM+NP scenarios\, our fit analyses find that non-zero NP 
 contribution is favored at the best fit point for both SM+V_2 and SM+T 
 depending on the HQET parameterization model. A key feature is then 
 realized in the B→D^(∗)τν observables. Our fit result of the HQET 
 parameters in the SM produces a consistent value for RD while smaller for 
 RD^∗\, compared with the previous SM prediction in the HFLAV report. On 
 the other hand\, SM+V_2 points to smaller and larger values for RD and 
 RD^∗ than the SM predictions. In particular\, the RD^* deviation from 
 the experimental measurement becomes smaller\, which could be interesting 
 for future improvement on measurements at the Belle II experiment.\n\nhttp
 s://agenda.hepl.phys.nagoya-u.ac.jp/indico/contributionDisplay.py?contribI
 d=27&sessionId=5&confId=1282
LOCATION:Nagoya University KMI Online
URL:https://agenda.hepl.phys.nagoya-u.ac.jp/indico/contributionDisplay.py?c
 ontribId=27&sessionId=5&confId=1282
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