Measurement of the $\vec{B} K^{*} γ$ branching fractions and asymmetries

Publisher Website

25 June 2004

journal article
research article
Published by American Physical Society (APS) in Physical Review D

Vol. 69 (11) , 112001
https://doi.org/10.1103/physrevd.69.112001

Abstract

We report measurements of the radiative decay

\vec{B} K^{*} γ .

The analysis is based on a data sample containing

85.0 \times 10^{6}

B meson pairs collected by the Belle detector at the KEKB storage ring. We measure branching fractions of

B {(B}^{0} \to K^{* 0} γ) = (4.01 \pm 0.21 \pm 0.17) \times 10^{- 5}

and

B {(B}^{+} \to K^{* +} γ) = (4.25 \pm 0.31 \pm 0.24) \times 10^{- 5},

where the first and second errors are statistical and systematic, respectively. The isospin asymmetry between

B^{0}

and

B^{+}

decay widths is measured to be

Δ_{0 +} = + 0.012 \pm 0.044 \pm 0.026,

assuming an equal production rate for

B^{0} B^{0}

and

B^{+} B^{-}

pairs from the

Υ (4 S)

resonance. We search for a partial rate asymmetry between

CP

conjugate modes, and find

A_{CP} (\vec{B} K^{*} γ) = - 0.015 \pm 0.044 \pm 0.012.

Keywords

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Version 1, 2004-02-27, ArXiv

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