Production of $σ$ in $ψ(2S)\to π^{+}π^{-}J/ψ$

Details Production of $σ$ in $ψ(2S)\to π^{+}π^{-}J/ψ$ Production of $σ$ in $ψ(2S)\to π^{+}π^{-}J/ψ$

2006-10-09

arxiv.org/abs/hep-ex/0610023v2

Phys.Lett.B645:19-25,2007

Physics

High Energy Physics

High Energy Physics - Experiment

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

Scientific paper

10.1016/j.physletb.2006.11.056

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 $(552^{+84}_{-106})-i(232^{+81}_{-72})$ MeV/$c^2$.

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