Scalar resonance contributions to the dipion transition rates of {upsilon}(4S,5S) in the rescattering model

Journal Article · Tue Apr 01 04:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.77.074003· OSTI ID:21249928

Ce, Meng ^[1]; Chao, K -T ^[1]

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1. Department of Physics, Peking University, Beijing 100871 (China)

In order to explain the observed unusually large dipion transition rates of {upsilon}(10870), the scalar resonance contributions in the rescattering model to the dipion transitions of {upsilon}(4S) and {upsilon}(5S) are studied. Since the imaginary part of the rescattering amplitude is expected to be dominant, the large ratios of the transition rates of {upsilon}(10870), which is identified with {upsilon}(5S), to that of {upsilon}(4S) can be understood as mainly coming from the difference between the p values in their decays into open bottom channels, and the ratios are estimated numerically to be about 200-600 with reasonable choices of parameters. The absolute and relative rates of {upsilon}(5S){yields}{upsilon}(1S,2S,3S){pi}{sup +}{pi}{sup -} and {upsilon}(5S){yields}{upsilon}(1S)K{sup +}K{sup -} are roughly consistent with data. We emphasize that the dipion transitions observed for some of the newly discovered Y states associated with charmonia may have similar features to the dipion transitions of {upsilon}(5S). Measurements on the dipion transitions of {upsilon}(6S) could provide further tests for this mechanism.

• OSTI ID: 21249928
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 77; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
KAONS MINUS
KAONS PLUS
PARTICLE DECAY
PIONS MINUS
PIONS PLUS
RESCATTERING
RESONANCE