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Measurement of Angular Coefficients of

\bar{B} \to D^{*} ℓ {\bar{ν}}_{ℓ}

: Implications for

| V_{c b} |

and Tests of Lepton Flavor Universality

https://doi.org/10.1103/PhysRevLett.133.131801

Prim, M T; Bernlochner, F; Metzner, F; Aihara, H; Asner, D M; Aushev, T; Ayad, R; Babu, V; Banerjee, Sw; Behera, P; et al (September 2024, Physical Review Letters)

We measure the complete set of angular coefficients

J_{i}

for exclusive

\bar{B} \to D^{*} ℓ {\bar{ν}}_{ℓ}

decays (

ℓ = e

μ

). Our analysis uses the full

711 {fb}^{- 1}

Belle dataset with hadronic tag-side reconstruction. The results allow us to extract the form factors describing the

\bar{B} \to D^{*}

transition and the Cabibbo-Kobayashi-Maskawa matrix element

| V_{cb} |

. Using recent lattice QCD calculations for the hadronic form factors, we find

| V_{cb} | = (40.7 \pm 0.7) \times 10^{- 3}

using the Boyd-Grinstein-Lebed parametrization, compatible with determinations from inclusive semileptonic decays. We search for lepton flavor universality violation as a function of the hadronic recoil parameter

w

and investigate the differences of the electron and muon angular distributions. We find no deviation from standard model expectations. Published by the American Physical Society2024

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