Direct Measurement of the $φ (1020)$ Leptonic Branching Ratio

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26 February 2001

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 86 (9) , 1698-1701
https://doi.org/10.1103/physrevlett.86.1698

Abstract

The process

e^{+} e^{-} \to μ^{+} μ^{-}

has been studied by the SND detector at the VEPP-2M

e^{+} e^{-}

collider in the

φ (1020)

-resonance energy region. The measured effective

φ

meson leptonic branching ratio

B (φ \to l^{+} l^{-}) \equiv \sqrt{B (φ \to e^{+} e^{-}) B (φ \to μ^{+} μ^{-})} = (2.89 \pm 0.10 \pm 0.06) \times 10^{- 4}

agrees well with the Particle Data Group value

B (φ \to e^{+} e^{-}) = (2.91 \pm 0.07) \times 10^{- 4}

, confirming

μ

-

e

universality. Without additional assumption of

μ

-

e

universality the branching ratio

B (φ \to μ^{+} μ^{-}) = (2.87 \pm 0.20 \pm 0.14) \times 10^{- 4}

was obtained.

Keywords

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