Article ID Journal Published Year Pages File Type
10725223 Physics Letters B 2007 7 Pages PDF
Abstract
Using 14M ψ(2S) events accumulated by BESII at the BEPC, a covariant helicity amplitude analysis is performed for ψ(2S)→π+π−J/ψ, J/ψ→μ+μ−. The π+π− mass spectrum, distinctly different from phase space, suggests σ 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 σ. The σ pole position is determined to be (552−106+84)−i(232−72+81) MeV/c2.
Related Topics
Physical Sciences and Engineering Physics and Astronomy Nuclear and High Energy Physics
Authors
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