Production of $\sigma$ in $\psi (2S)\to {\pi }^{+}{\pi }^{-}J/\psi$

Abstract

Using 14M $\psi (2S)$ events accumulated by BESII at the BEPC, a Covariant Helicity Amplitude Analysis is performed for $\psi (2S)\to {\pi }^{+}{\pi }^{-}J/\psi ,J/\psi \to {\mu }^{+}{\mu }^{-}$. The ${\pi }^{+}{\pi }^{-}$ mass spectrum, distinctly different from phase space, suggests $\sigma$ production in this process. Two different theoretical schemes are used in the global fit to the data. The results are consistent with the existence of the $\sigma$. The $\sigma$ pole position is determined to be $(552_{-106}^{+84})-i(232_{-72}^{+81})$ MeV/$c^2$.

9 pages, 11 figures. Accepted by Phys. Lett. B

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