Measurement of B({upsilon}(5S){yields}B{sub s}{sup (*)}B{sub s}{sup (*)}) using {phi} mesons

Journal Article · Mon Jan 01 04:00:00 EST 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.75.012002· OSTI ID:20933195

Huang, G S; Miller, D H; Pavlunin, V; Sanghi, B; Shipsey, I P. J.; Xin, B ^[1]; Adams, G S; Anderson, M; Cummings, J P; Danko, I; Napolitano, J ^[2]; He, Q; Insler, J; Muramatsu, H; Park, C S; Thorndike, E H; Yang, F ^[3]; Coan, T E; Gao, Y S; Liu, F ^[4]

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1. Purdue University, West Lafayette, Indiana 47907 (United States)
2. Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)
3. University of Rochester, Rochester, New York 14627 (United States)
4. Southern Methodist University, Dallas, Texas 75275 (United States)

Knowledge of the B{sub s} decay fraction of the {upsilon}(5S) resonance, f{sub S}, is important for B{sub s} meson studies at the {upsilon}(5S) energy. Using a data sample collected by the CLEO III detector at CESR consisting of 0.423 fb{sup -1} on the {upsilon}(5S) resonance, 6.34 fb{sup -1} on the {upsilon}(4S) and 2.32 fb{sup -1} in the continuum below the {upsilon}(4S), we measure B({upsilon}(5S){yields}{phi}X)=(13.8{+-}0.7{sub -1.5}{sup +2.3})% and B({upsilon}(4S){yields}{phi}X)=(7.1{+-}0.1{+-}0.6)%; the ratio of the two rates is (1.9{+-}0.1{sub -0.2}{sup +0.3}). This is the first measurement of the {phi} meson yield from the {upsilon}(5S). Using these rates, and a model dependent estimate of B(B{sub s}{yields}{phi}X), we determine f{sub S}=(24.6{+-}2.9{sub -5.3}{sup +11.0})%. We also update our previous independent measurement of f{sub S} made using the inclusive D{sub s} yields to now be (16.8{+-}2.6{sub -3.4}{sup +6.7})%, due to a better estimate of the number of hadronic events. We also report the total {upsilon}(5S) hadronic cross section above continuum to be {sigma}(e{sup +}e{sup -}{yields}{upsilon}(5S))=(0.301{+-}0.002{+-}0.039) nb. This allows us to extract the fraction of B mesons as (58.9{+-}10.0{+-}9.2)%, equal to 1-f{sub S}. Averaging the three methods gives a model dependent result of f{sub S}=(21{sub -3}{sup +6})%.

• OSTI ID: 20933195
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 1 Vol. 75; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
B MESONS
CESR STORAGE RING
CROSS SECTIONS
ELECTRON-POSITRON INTERACTIONS
ELECTRONS
MULTIPARTICLE SPECTROMETERS
PARTICLE DECAY
PARTICLE IDENTIFICATION
POSITRONS