Observation ofJ/ψradiative decay to pseudoscalarωω

Publisher Website

21 October 1985

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

Vol. 55 (17) , 1723-1726
https://doi.org/10.1103/physrevlett.55.1723

Abstract

We present evidence for the radiative decay J/ψ→γωω with a branching fraction of (1.76±0.09±0.45)×

10^{- 3}

. The ωω invariant-mass distribution peaks at 1.8 GeV/

c^{2}

, just above threshold. Analysis of angular correlations indicates that ωω system below 2 GeV/

c^{2}

is predominantly pseudoscalar. Upper limits are presented for the branching fractions of ωω decays of the θ(1690), the

g_{T}

states near 2.2 GeV/

c^{2}

, and the

η_{c}

.

Keywords

This publication has 15 references indexed in Scilit:

The Mark III spectrometer
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1984
Measurement of the reaction γγ→π+π+π−π− at PETRA
The European Physical Journal C, 1984
Are $Q^{2} {\bar{Q}}^{2}$ states observable?
Physical Review D, 1984
Reaction $π^{-} p \to ϕ ϕ n$ and Evidence for Glueballs
Physical Review Letters, 1982
Observation of the Decay $ψ \to γ ρ^{0} ρ^{0}$
Physical Review Letters, 1982
Angular correlations inγγ→ρ 0ρ0 near threshold
The European Physical Journal C, 1982
A measurement of the cross section for four-pion production in λλ collisions at spear
Physics Letters B, 1981
RHO-RHO production by two photon scattering
Physics Letters B, 1980
Further evidence for a 2π+2π−1.7 GeV/c2 enhancement observed in the pp → 3π+3π−πo reaction at 5.7 GeV/c
Nuclear Physics B, 1971
Evidence for a strong, possibly resonant, scalar ρρ interaction
Il Nuovo Cimento A (1971-1996), 1966