Direct measurement of the phi(1020) leptonic branching ratio
Abstract
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-)=sqrtB(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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