## Abstract

Using the Crystal Ball detector operating at the DORIS II storage ring we have measured the leptonic partial widths G{cyrillic}_{ee} of the Υ(1 S) and Υ(2 S) resonances. We find {Mathematical expression} and {Mathematical expression} The effect on G{cyrillic}_{ee} of applying different prescriptions for radiative corrections is discussed. We also measure R, the ratio of non-resonant hadronic cross section to the Born cross section of μ pair production, at c.m. energy W=9.39 GeV to be R=3.48±0.04±0.16.

Original language | English (US) |
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Pages (from-to) | 49-61 |

Number of pages | 13 |

Journal | Zeitschrift für Physik C Particles and Fields |

Volume | 40 |

Issue number | 1 |

DOIs | |

State | Published - Mar 1988 |

Externally published | Yes |

## All Science Journal Classification (ASJC) codes

- Physics and Astronomy (miscellaneous)

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