On the structure of the pi pi invariant mass spectra of the Upsilon(4S)-->Upsilon(1S,2S) pi^+ pi^- decays

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dc.creatorGuo, Feng-Kun
dc.creatorShen, Peng-Nian
dc.creatorChiang, Huan-Ching
dc.creatorPing, Rong-Gang
dc.date2006-01-16
dc.date2007-10-09
dc.date.accessioned2026-07-07T11:26:52Z
dc.date.available2026-07-07T11:26:52Z
dc.descriptionWe perform a model-independent analysis for recently reported data of the $π^+π^-$ invariant mass spectra in the $Υ(4S)\toΥ(1S,2S)π^+π^-$ decays and point out that there does exist a broad peak below 0.6 GeV in the data of the $Υ(4S)\toΥ(1S)π^+π^-$ decay, which is analogous to that in the $Υ(3S)\toΥ(1S)π^+π^-$ decay. With the data of $Υ(4S)$ decays, we further test our model developed for studying the puzzle in the $Υ(3S)\toΥ(1S)π^+π^-$ 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 $\cosθ_π^*$ distributions of $Υ(4S)\toΥ(1S,2S)π^+π^-$ decays, which can be used to justify our model prediction.
dc.description11 pages, 5 figures. Extended to include new data; title changed. Version accepted for publication in Phys. Lett. B
dc.identifierhttps://arxiv.org/abs/hep-ph/0601120
dc.identifierhttp://arxiv.org/abs/hep-ph/0601120
dc.identifierPhys.Lett.B658:27-32,2007
dc.identifierdoi:10.1016/j.physletb.2007.10.021
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195968
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.titleOn the structure of the pi pi invariant mass spectra of the Upsilon(4S)-->Upsilon(1S,2S) pi^+ pi^- decays
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