Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-01-16
Phys.Lett.B658:27-32,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, 5 figures. Extended to include new data; title changed. Version accepted for publication in Phys. Lett. B
Scientific paper
10.1016/j.physletb.2007.10.021
We perform a model-independent analysis for recently reported data of the $\pi^+\pi^-$ invariant mass spectra in the $\Upsilon(4S)\to\Upsilon(1S,2S)\pi^+\pi^-$ decays and point out that there does exist a broad peak below 0.6 GeV in the data of the $\Upsilon(4S)\to\Upsilon(1S)\pi^+\pi^-$ decay, which is analogous to that in the $\Upsilon(3S)\to\Upsilon(1S)\pi^+\pi^-$ decay. With the data of $\Upsilon(4S)$ decays, we further test our model developed for studying the puzzle in the $\Upsilon(3S)\to\Upsilon(1S)\pi^+\pi^-$ decay. The result shows that with such a model, all the $\pi^+\pi^-$ invariant mass spectra of $\Upsilon(4S)$ decays can be described. We also predict the $\cos\theta_{\pi}^*$ distributions of $\Upsilon(4S)\to\Upsilon(1S,2S)\pi^+\pi^-$ decays, which can be used to justify our model prediction.
Chiang Huan-Ching
Guo Feng-Kun
Ping Rong-Gang
Shen Peng-Nian
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