Measurement of the Branching Fractions for J/psi to ell^+ ell^-

Details Measurement of the Branching Fractions for J/psi to ell^+ ell^- Measurement of the Branching Fractions for J/psi to ell^+ ell^-

2005-03-16

arxiv.org/abs/hep-ex/0503027v3

Phys.Rev.D71:111103,2005

Physics

High Energy Physics

High Energy Physics - Experiment

11 pages postscript,also available through this http://www.lns.cornell.edu/public/CLNS/2005/

Scientific paper

10.1103/PhysRevD.71.111103

We present measurements of the branching fractions for J/psi --> e+e- and mu+mu- using 3M psi(2S) decays collected with the CLEO detector operating at the CESR e+e- collider. We obtain B(J/psi --> e+e-) = (5.945 +- 0.067 +- 0.042 )% and B(J/psi --> mu+mu-) = (5.960 +- 0.065 +- 0.050)%, leading to an average of B(J/psi --> l+l-) = (5.953 +- 0.056 +- 0.042)% and a ratio of B(J/psi --> e+e-) / B(J/psi --> mu+mu-) = (99.7 +- 1.2 +- 0.6)%, all consistent with, but more precise than, previous measurements.

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