Leptonic Decays of Vector Mesons: the Branching Ratio of the Electron-Positron Decay Mode of the Phi Meson

U. Becker; William K. Bertram; M. Binkley; C. L. Jordan; T. M. Knasel; R. Marshall; D. J. Quinn; M. Rohde; A. J. S. Smith; Samuel C. C. Ting

doi:10.1103/PhysRevLett.21.1504

Leptonic Decays of Vector Mesons: the Branching Ratio of the Electron-Positron Decay Mode of the Phi Meson

U. Becker^*, William K. Bertram^*, M. Binkley, C. L. Jordan^*, T. M. Knasel^*, R. Marshall^*, D. J. Quinn, M. Rohde, A. J. S. Smith et al.

Samuel C. C. Ting^*

Deutsches Elektronen-Synchrotron, Hamburg, Germany

^*Also Department of Physics and Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts.

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Phys. Rev. Lett. 21, 1504 – Published 18 November, 1968

DOI: https://doi.org/10.1103/PhysRevLett.21.1504

Abstract

An experiment designed to measure the branching ratio of the phi meson to $e^{+} e^{-}$ was performed at DESY by measuring phi production and phi decay to $e^{+} e^{-}$ with the same apparatus. The results of this experiment, based on $10^{4}$ $ϕ \to K^{+} K^{-}$ events and 41 $ϕ \to e^{+} e^{-}$ events on carbon, yield a branching ratio of (2.9±0.8)× $10^{- 4}$ . This result is compared with various theoretical predictions.

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Physical Review Letters

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Leptonic Decays of Vector Mesons: the Branching Ratio of the Electron-Positron Decay Mode of the Phi Meson

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Leptonic Decays of Vector Mesons: the Branching Ratio of the Electron-Positron Decay Mode of the Phi Meson

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