Measurement of B(Y(nS) -> mu+ mu-) at CLEO

Details Measurement of B(Y(nS) -> mu+ mu-) at CLEO Measurement of B(Y(nS) -> mu+ mu-) at CLEO

2004-12-22

arxiv.org/abs/hep-ex/0412064v1

Physics

High Energy Physics

High Energy Physics - Experiment

Talk presented at the 1st Meeting of the APS Topical Group on Hadronic Physics (Fermilab, Oct 24-26, 2004). LaTeX 4 pages, 2 f

Scientific paper

The decay branching fractions of the three narrow Upsilon resonances to mu+ mu- have been measured by analyzing about 4.3 1/fb 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.

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