Peak shifts due to B{sup (*)}-B{sup (*)} rescattering in {upsilon}(5S) dipion transitions
- Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871 (China)
We study the energy distributions of dipion transitions {upsilon}(5S) to {upsilon}(1S,2S,3S){pi}{sup +}{pi}{sup -} in the final-state rescattering model. Since the {upsilon}(5S) is well above the open bottom thresholds, the dipion transitions are expected to mainly proceed through the real processes {upsilon}(5S){yields}B{sup (*)}B{sup (*)} and B{sup (*)}B{sup (*)}{yields}{upsilon}(1S,2S,3S){pi}{sup +}{pi}{sup -}. We find that the energy distributions of {upsilon}(1S,2S,3S){pi}{sup +}{pi}{sup -} markedly differ from that of {upsilon}(5S){yields}B{sup (*)}B{sup (*)}. In particular, the resonance peak will be pushed up by about 7-20 MeV for these dipion transitions relative to the main hadronic decay modes. These predictions can be used to test the final-state rescattering mechanism in hadronic transitions for heavy quarkonia above the open flavor thresholds.
- OSTI ID:
- 21250626
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 78, Issue 3; Other Information: DOI: 10.1103/PhysRevD.78.034022; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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