Measurement of the branching fraction for the decay {upsilon}(4S){yields}{upsilon}(1S){pi}{sup +}{pi}{sup -}

Journal Article · Sun Mar 01 00:00:00 EST 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.79.051103· OSTI ID:21260048

Sokolov, A; Shapkin, M; Belous, K ^[1]; Aihara, H ^[2]; Arinstein, K; Bondar, A; Eidelman, S; Epifanov, D; Gabyshev, N; Kuzmin, A; Poluektov, A; Shwartz, B; Usov, Y; Vinokurova, A; Zhilich, V; Zhulanov, V; Zyukova, O ^[3]; Aushev, T ^[4]; Bakich, A M; McOnie, S ^[5]

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1. Institute of High Energy Physics, Protvino (Russian Federation)
2. Department of Physics, University of Tokyo, Tokyo (Japan)
3. Budker Institute of Nuclear Physics, Novosibirsk (Russian Federation)
4. Institute for Theoretical and Experimental Physics, Moscow (Russian Federation)
5. 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, Vol. 79, Issue 5; Other Information: DOI: 10.1103/PhysRevD.79.051103; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
BRANCHING RATIO
ELECTRON-POSITRON COLLISIONS
EMISSION
KEK LINAC
KEV RANGE 01-10
MUONS MINUS
PARTICLE DECAY
PIONS MINUS
PIONS PLUS