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Measurement of the processese + e e + e ande + e γγ at PETRA

Abstract

Cross sections for the reactionse + e e + e (Bhabha scattering) ande + e →γγ are measured for center-of-mass (c.m.) energies\(\sqrt s \) 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,\(\left\langle {\sqrt s } \right\rangle = 34.6 GeV\), the 1 δ limits 0.12<sin2 ϑ w <0.38 are obtained for the weak mixing angle. The higher order (α3) QED processese + e e + e γ ande + e →γγγ are also studied and are found to agree with the α3 QED predictions. A search for excited electrons is carried out by investigating the (e ±γ) invariant mass distribution in the reactione + e e + e γ.

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JADE Collaboration., Bartel, W., Becker, L. et al. Measurement of the processese + e e + e ande + e γγ at PETRA. Z. Phys. C - Particles and Fields 19, 197–203 (1983). https://doi.org/10.1007/BF01572248

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Keywords

  • Field Theory
  • Elementary Particle
  • Quantum Field Theory
  • Mass Distribution
  • Invariant Mass