Observation of the decay {upsilon}(4S){yields}{upsilon}(1S){pi}{sup +}{pi}{sup -}

Journal Article · Sun Apr 01 04:00:00 EDT 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.75.071103· OSTI ID:21020233

Sokolov, A; Shapkin, M; Belous, K ^[1]; Abe, K; Adachi, I; Gershon, T; Haba, J; Hazumi, M; Itoh, R; Iwasaki, Y; Katayama, N; Kichimi, H; Krokovny, P; Limosani, A; Nakamura, I; Nakao, M; Nishida, S; Nozaki, T; Ozaki, H; Sakai, Y ^[2]

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1. Institute of High Energy Physics, Protvino (Russian Federation)
2. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)

We study transitions between {upsilon} states with the emission of charged pions using 477 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 B({upsilon}(4S){yields}{upsilon}(1S){pi}{sup +}{pi}{sup -})xB({upsilon}(1S){yields}{mu}{sup +}{mu}{sup -})= =(4.42{+-}0.81(stat){+-}0.56(sys))x10{sup -6}. When the PDG value for B({upsilon}(1S){yields}{mu}{sup +}{mu}{sup -}) is used, this corresponds to B({upsilon}(4S){yields}{upsilon}(1S){pi}{sup +}{pi}{sup -})=(1.78{+-}0.33(stat){+-}0.23(sys) = )x10{sup -4} and a partial decay width {gamma}({upsilon}(4S){yields}{upsilon}(1S){pi}{sup +}{pi}{sup -})=(3.65{+-}0.67(stat){+-}0.6 = 5(sys)) keV.

• OSTI ID: 21020233
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 75; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
BRANCHING RATIO
ELECTRONS
HADRONIC PARTICLE DECAY
KEK SYNCHROTRON
KEV RANGE
MULTIPARTICLE SPECTROMETERS
MUONS MINUS
MUONS PLUS
PARTICLE IDENTIFICATION
PARTICLE WIDTHS
PIONS MINUS
PIONS PLUS
POSITRONS
RESONANCE PARTICLES
UPSILON-10580 MESONS
UPSILON-9460 MESONS