Measurement of the branching fraction for the decay {upsilon}(4S){yields}{upsilon}(1S){pi}{sup +}{pi}{sup -}
Journal Article
·
· Physical Review. D, Particles Fields
- Institute of High Energy Physics, Protvino (Russian Federation)
- Department of Physics, University of Tokyo, Tokyo (Japan)
- Budker Institute of Nuclear Physics, Novosibirsk (Russian Federation)
- Institute for Theoretical and Experimental Physics, Moscow (Russian Federation)
- University of Sydney, Sydney, New South Wales (Australia)
We study transitions between {upsilon} states with the emission of charged pions using 604.6 fb{sup -1} of data collected with the Belle detector at the KEKB asymmetric-energy e{sup +}e{sup -} collider. The measured product branching fraction is B({upsilon}(4S){yields}{upsilon}(1S){pi}{sup +}{pi}{sup -})xB({upsilon}(1S){yields}{mu}{sup +}{mu}{sup -})=(2.11{+-}0.30(stat){+-}0.14(sys))x10{sup -6} and the partial decay width is {gamma}({upsilon}(4S){yields}{upsilon}(1S){pi}{sup +}{pi}{sup -})=(1.75{+-}0.25(stat){+-}0.24(sys)) keV.
- OSTI ID:
- 21260048
- Journal Information:
- Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 5 Vol. 79; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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