Measurement of the muonic branching fractions of the narrow upsilon resonances
Besson, David Zeke
AMERICAN PHYSICAL SOC
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The decay branching fractions of the three narrow Y resonances to mu(+)mu(-) have been measured by analyzing about 4.3 fb(-1) e(+)e(-) data collected with the CLEO III detector. The branching fraction B(Y(1S)-->mu(+)mu(-))=(2.49+/-0.02+/-0.07)% is consistent with the current world average, but B(Y(2S)-->mu(+)mu(-))=(2.03+/-0.03+/-0.08)% and B(Y(3S)-->mu(+)mu(-))=(2.39+/-0.07+/-0.10)% are significantly larger than prior results. These new muonic branching fractions imply a narrower total decay width for the Y(2S) and Y(3S) resonances and lower other branching fractions that rely on these decays in their determination.
Adams, GS, Chasse, M, et al. Measurement of the muonic branching fractions of the narrow upsilon resonances. PHYSICAL REVIEW LETTERS. January 2005. 94(1)
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