Measurement of the branching fractions for psi(2S)-->e+e- and psi(2S)-->mu+mu-

Details Measurement of the branching fractions for psi(2S)-->e+e- and psi(2S)-->mu+mu- Measurement of the branching fractions for psi(2S)-->e+e- and psi(2S)-->mu+mu-

2001-09-07

arxiv.org/abs/hep-ex/0109004v2

Phys.Rev.D65:031101,2002

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 2 figures, published as Physical Review D 65 031101(R) rapid communications

Scientific paper

10.1103/PhysRevD.65.031101

We measure the branching fractions of the psi(2S) meson to the leptonic final states e+e- and mu+mu- relative to that for psi(2S)-->J/psi pi+pi-. The method uses psi(2S) mesons produced in the decay of B mesons at the Upsilon(4S) resonance in a data sample collected with the BABAR detector at the Stanford Linear Accelerator Center. Using previous measurements for the psi(2S)-->J/psi pi+pi- branching fraction, we determine the e+e- and mu+mu- branching fractions to be 0.0078+/-0.0009+/-0.0008 and 0.0067+/-0.0008+/-0.0007 respectively.

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