Determination of $|V_{cb}|$ from $B\to D\ell\nu$ decays using 2019-2021 Belle II data - INSPIRE

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Determination of $|V_{cb}|$ from $B\to D\ell\nu$ decays using 2019-2021 Belle II data

Belle-II

Collaboration

Oct 24, 2022

20 pages

e-Print:

2210.13143 [hep-ex]

Report number:

BELLE2-CONF-PH-2022-010

Experiments:

KEK-BF-BELLE-II

View in:

ADS Abstract Service

reference search11 citations

Citations per year

Abstract: (arXiv)

We present a determination of the magnitude of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element

V_{cb}

using

B\to D\ell\nu

decays. The result is based on

e^+e^-\to\Upsilon(4S)

data recorded by the Belle II detector corresponding to 189.2/fb of integrated luminosity. The semileptonic decays

B^0\to D^-(\to K^+\pi^-\pi^-)\ell^+\nu_\ell

and

B^+\to\bar D^0(\to K^+\pi^-)\ell^+\nu_\ell

are reconstructed, where

\ell

is either electron or a muon. The second

B

meson in the

\Upsilon(4S)

event is not explicitly reconstructed. Using the diamond-frame method, we determine the

B

meson four-momentum and thus the hadronic recoil. We extract the partial decay rates as functions of

w

and perform a fit to the decay form-factor and the CKM parameter

|V_{cb}|

using the BGL parameterization of the form factor and lattice QCD input from the FNAL/MILC and HPQCD collaborations. We obtain

\eta_{EW}|V_{cb}|=(38.53\pm 1.15)\times 10^{-3}

, where

\eta_{EW}

is an electroweak correction, and the error accounts for theoretical and experimental sources of uncertainty.

Note:

20 pages, 4 figures

electron positron: annihilation
electron positron: colliding beams
electroweak interaction: correction
form factor: parametrization
recoil: hadronic
decay: form factor
BELLE
KEK-B
Upsilon(10570): electroproduction
CKM matrix

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