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

B. Aubert, the BABAR Collaboration

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 pro…