Article ID Journal Published Year Pages File Type
8195718 Physics Letters B 2007 6 Pages PDF
Abstract
We perform a model-independent analysis for recently reported data of the π+π− invariant mass spectra in the ϒ(4S)→ϒ(1S,2S)π+π− decays and point out that there does exist a broad peak below 0.6 GeV in the data of the ϒ(4S)→ϒ(1S)π+π− decay, which is analogous to that in the ϒ(3S)→ϒ(1S)π+π− decay. With the data of ϒ(4S) decays, we further test our model developed for studying the puzzle in the ϒ(3S)→ϒ(1S)π+π− decay. The result shows that with such a model, all the π+π− invariant mass spectra of ϒ(4S) decays can be described. We also predict the cosθπ∗ distributions of ϒ(4S)→ϒ(1S,2S)π+π− decays, which can be used to justify our model prediction.
Related Topics
Physical Sciences and Engineering Physics and Astronomy Nuclear and High Energy Physics
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