### Abstract

Cross sections for the reactions e^{+}e^{-}→e^{+}e^{-} (Bhabha scattering) and e^{+}e^{-}→γγ are measured for center-of-mass (c.m.) energies {Mathematical expression} between 12.0 and 34.6 GeV. The results agree with the predictions of Quantum Electrodynamics (QED) and the cut-off parameters are determined. From Bhabha scattering at the highest energy, {Mathematical expression}, the 1 δ limits 0.12<sin^{2} θ{symbol}_{w}<0.38 are obtained for the weak mixing angle. The higher order (α^{3}) QED processes e^{+}e^{-}→e^{+}e^{-}γ and e^{+}e^{-}→γγγ are also studied and are found to agree with the α^{3} QED predictions. A search for excited electrons is carried out by investigating the (e^{±γ}) invariant mass distribution in the reaction e^{+}e^{-}→e^{+}e^{-}γ.

Original language | English |
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Pages (from-to) | 197-203 |

Number of pages | 7 |

Journal | Zeitschrift für Physik C Particles and Fields |

Volume | 19 |

Issue number | 3 |

DOIs | |

Publication status | Published - 1983 Sep 1 |

Externally published | Yes |

### ASJC Scopus subject areas

- Physics and Astronomy (miscellaneous)

## Fingerprint Dive into the research topics of 'Measurement of the processes e<sup>+</sup>e<sup>-</sup>→e<sup>+</sup>e<sup>-</sup> and e<sup>+</sup>e<sup>-</sup>→γγ at PETRA'. Together they form a unique fingerprint.

## Cite this

^{+}e

^{-}→e

^{+}e

^{-}and e

^{+}e

^{-}→γγ at PETRA.

*Zeitschrift für Physik C Particles and Fields*,

*19*(3), 197-203. https://doi.org/10.1007/BF01572248