2006/01/31 by Feng-Kun Guo, Peng-Nian Shen, H.C. Chiang +3 · 14 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Invariant (physics) #Invariant mass #Mass spectrometry #Mass spectrum #Mathematical physics #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Scroll #Spectral line #hep-ex #hep-ph
paper · pdf · doi:10.1016/j.physletb.2007.10.021
published in Physics Letters B 658(1-3), 27-32 (Elsevier BV) · 11 pages, 5 figures. Extended to include new data; title changed. Version accepted for publication in Phys. Lett. B
arxiv created 2007/10/09 · openalex publication_date 2007/10/25 · arxiv updated 2009/12/01 · openalex created_date 2017/02/10 · openalex updated_date 2026/08/05
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.