# Measurement of the branching fractions for $\psi(2S) \rightarrow e^+e^-$ and $\psi(2S) \rightarrow \mu^+\mu^-$

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/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.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00011417
Contributor : Hélène Kerec Connect in order to contact the contributor
Submitted on : Friday, March 29, 2002 - 9:52:36 AM
Last modification on : Saturday, October 9, 2021 - 4:00:11 AM

### Citation

B. Aubert, D. Boutigny, J.M. Gaillard, A. Hicheur, Y. Karyotakis, et al.. Measurement of the branching fractions for $\psi(2S) \rightarrow e^+e^-$ and $\psi(2S) \rightarrow \mu^+\mu^-$. Physical Review D, American Physical Society, 2002, 65, pp.031101. ⟨10.1103/PhysRevD.65.031101⟩. ⟨in2p3-00011417⟩

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