Measurement of B(Υ(5S)Bs(*)B¯s(*)) using ϕ mesons

G. S. Huang et al. (CLEO Collaboration)
Phys. Rev. D 75, 012002 – Published 9 January 2007

Abstract

Knowledge of the Bs decay fraction of the Υ(5S) resonance, fS, is important for Bs meson studies at the Υ(5S) energy. Using a data sample collected by the CLEO III detector at CESR consisting of 0.423fb1 on the Υ(5S) resonance, 6.34fb1 on the Υ(4S) and 2.32fb1 in the continuum below the Υ(4S), we measure B(Υ(5S)ϕX)=(13.8±0.71.5+2.3)% and B(Υ(4S)ϕX)=(7.1±0.1±0.6)%; the ratio of the two rates is (1.9±0.10.2+0.3). This is the first measurement of the ϕ meson yield from the Υ(5S). Using these rates, and a model dependent estimate of B(BsϕX), we determine fS=(24.6±2.95.3+11.0)%. We also update our previous independent measurement of fS made using the inclusive Ds yields to now be (16.8±2.63.4+6.7)%, due to a better estimate of the number of hadronic events. We also report the total Υ(5S) hadronic cross section above continuum to be σ(e+eΥ(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-fS. Averaging the three methods gives a model dependent result of fS=(213+6)%.

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  • Received 12 October 2006

DOI:https://doi.org/10.1103/PhysRevD.75.012002

©2007 American Physical Society

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Vol. 75, Iss. 1 — 1 January 2007

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