Study of the Decay $\frac{J}{ψ} \to γ η π π$

Publisher Website

5 September 1983

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

Vol. 51 (10) , 859-862
https://doi.org/10.1103/physrevlett.51.859

Abstract

The radiative decay

\frac{J}{ψ} \to γ η π π

has been studied with data taken with the crystal-ball detector at the SPEAR

e^{+} e^{-}

storage ring. In addition to the well-known

η^{'}

, the

η π π

mass spectrum shows a broad enhancement centered at ∼ 1700 MeV. The authors have searched for the

ι (1440)

in the

η π π

mass spectrum and find

\frac{R (\frac{J}{ψ} \to γ ι) (ι \to η π π)}{R (\frac{J}{ψ} \to γ ι) (ι \to K \bar{K} π)} < 0.5

(90% confidence level).

Keywords

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