Determination of |𝑉𝑐⁢𝑏| using ¯𝐵0→𝐷*+⁢ℓ−⁢¯𝜈ℓ decays with Belle II

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  (Published version)

Date

2023

Authors

Adachi, I.
Aggarwal, L.
Ahmed, H.
Aihara, H.
Akopov, N.
Aloisio, A.
Anh Ky, N.
Asner, D.M.
Atmacan, H.
Aushev, T.

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Journal article

Citation

Physical Review D (particles, fields, gravitation, and cosmology), 2023; 108(9):092013-1-092013-26

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Belle II Collaboration

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DOI

10.1103/physrevd.108.092013

Abstract

We determine the Cabibbo-Kobayashi-Maskawa matrix-element magnitude jVcbj using B¯ 0 → Dþl−ν¯l decays reconstructed in 189 fb−1 of collision data collected by the Belle II experiment, located at the SuperKEKB eþe− collider. Partial decay rates are reported as functions of the recoil parameter w and three decay angles separately for electron and muon final states. We obtain jVcbj using the Boyd-Grinstein-Lebed and Caprini-Lellouch-Neubert parametrizations, and find jVcbjBGL ¼ ð40.57 0.31 0.95 0.58Þ × 10−3 and jVcbjCLN ¼ ð40.13 0.27 0.93 0.58Þ × 10−3 with the uncertainties denoting statistical components, systematic components, and components from the lattice QCD input, respectively. The branching fraction is measured to be BðB¯ 0 → Dþl−ν¯lÞ¼ð4.922 0.023 0.220Þ%. The ratio of branching fractions for electron and muon final states is found to be 0.998 0.009 0.020. In addition, we determine the forward-backward angular asymmetry and the Dþ longitudinal polarization fractions. All results are compatible with lepton-flavor universality in the Standard Model.

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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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http://purl.org/au-research/grants/arc/DP200101792
 http://purl.org/au-research/grants/arc/DP210101900
 http://purl.org/au-research/grants/arc/DP210102831
 http://purl.org/au-research/grants/arc/DE220100462
 http://purl.org/au-research/grants/arc/LE210100098
 http://purl.org/au-research/grants/arc/LE230100085

Published Version

http://dx.doi.org/10.1103/physrevd.108.092013

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Persistent link to this record

https://hdl.handle.net/2440/142118