Direct measurement of the phi(1020) leptonic branching ratio

Physics – High Energy Physics – High Energy Physics - Experiment

Scientific paper

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RevTeX, 5 pages, 3 figures. To be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.86.1698

The process e+e-->mu+mu- has been studied by SND detector at VEPP-2M e+e- collider in the phi(1020)-resonance energy region. The measured effective phi meson leptonic branching ratio: B(phi->l+l-)=sqrt{B(phi->e+e-)*B(phi->mu+mu-)}=(2.89+-0.10+-0.06)*10^{-4} agrees well with the PDG value B(phi->e+e-)=(2.91+-0.07)*10^{-4} confirming mu-e universality. Without additional assumption of mu-e universality the branching ratio B(phi->mu+mu-)=(2.87+-0.20+-0.14)*10^{-4} was obtained.

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