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/psipi(+) pi(-). The method uses psi(2S) mesons produced in the decay of B mesons at the Y(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/psipi(+) 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.

Measurement of the branching fractions for psi(2S)-> e(+)e(-) and psi(2S)->mu(+)mu(-) RID C-2728-2008 RID A-2675-2009 RID C-5223-2009 RID C-5719-2008 RID D-1189-2011

ANGELINI, CARLO;BATIGNANI, GIOVANNI;BETTARINI, STEFANO;FORTI, FRANCESCO;GIORGI, MARCELLO;PAOLONI, EUGENIO;RIZZO, GIULIANA;TRIGGIANI, GIUSEPPE;CALDERINI, GIOVANNI;
2002

Abstract

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/psipi(+) pi(-). The method uses psi(2S) mesons produced in the decay of B mesons at the Y(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/psipi(+) 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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