Measurement of the $B \to J / ψ K^{*}$ (892) Decay Amplitudes

Publisher Website

20 November 2001

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

Vol. 87 (24) , 241801
https://doi.org/10.1103/physrevlett.87.241801

Abstract

We present a measurement of the decay amplitudes in

B \to J / ψ K^{*} (892)

channels using

20.7 fb^{- 1}

of data collected at the

ϒ (4 S)

resonance with the BABAR detector at PEP-II. We measure a

P

-wave fraction

R_{⊥} = (16.0 \pm 3.2 \pm 1.4) %

and a longitudinal polarization fraction

(59.7 \pm 2.8 \pm 2.4) %

. The measurement of a relative phase that is neither 0 nor

π

,

φ_{∥} = 2.50 \pm 0.20 \pm 0.08

radians, favors a departure from the factorization hypothesis. Although the decay

B \to J / ψ K π

proceeds mainly via

K^{*} (892)

, there is also evidence for

K_{2}^{*} (1430)

and

K π

S

-wave contributions.

Keywords

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