A Study of J/psi-->gamma gamma V(rho,phi) Decays with the BESII Detector

Abstract

Using a sample of $58\times 10^6$ $J/\psi$ events collected with the BESII detector, radiative decays $J/\psi \to \gamma \gamma V$, where $V=\rho$ or $\varphi$, are studied. A resonance around 1420 MeV/c${}^2$ (X(1424)) is observed in the $\gamma \rho$ mass spectrum. Its mass and width are measured to be $1424\pm 10(stat)\pm 11(sys)$ MeV/c${}^2$ and $101.0\pm 8.8\pm 8.8$ MeV/c${}^2$, respectively, and its branching ratio $B(J/\psi \to \gamma X(1424)\to \gamma \gamma \rho )$ is determined to be $(1.07\pm 0.17\pm 0.11)\times 10^{-4}$. A search for $X(1424)\to \gamma \varphi$ yields a 95% C.L. upper limit $B(J/\psi \to \gamma X(1424)\to \gamma \gamma \varphi )<0.82\times 10^{-4}$.

arXiv comment10 pages, 5 figures, submitted to PLB

References in corpus (4)

• Light Meson Spectroscopy
• Determining the Gluonic Content of Isoscalar Mesons
• A measurement of the branching fractions of the f1(1285) and f1(1420) produced in central pp interactions at 450 GeV/c
• Light resonances in Ks K pi and eta pi pi final states in gamma gamma collisions at LEP

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