Radiative $B$ Meson Decays into $K π γ$ and $K π π γ$ Final States

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13 November 2002

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

Vol. 89 (23) , 231801
https://doi.org/10.1103/physrevlett.89.231801

Abstract

We report observations of radiative

B

meson decays into the

K^{+} π^{-} γ

and

K^{+} π^{-} π^{+} γ

final states. In the

B^{0} \to K^{+} π^{-} γ

channel, we present evidence for decays via an intermediate tensor meson state with a branching fraction of

B (B^{0} \to K_{2}^{*} (1430)^{0} γ) = [1.3 \pm 0.5 (s t a t) \pm 0.1 (s y s t)] \times 10^{- 5}

. We measure the branching fraction

B (B^{+} \to K^{+} π^{-} π^{+} γ) = [2.4 \pm 0.5 (s t a t)_{- 0.2}^{+ 0.4} (s y s t)] \times 10^{- 5}

, in which the

B^{+} \to K^{* 0} π^{+} γ

and

B^{+} \to K^{+} ρ^{0} γ

channels dominate. The analysis is based on a data set of

29.4 {f b}^{- 1}

recorded by the Belle experiment at the KEKB collider.

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