Abstract
QED processes up to O(α4) have been studied at center-of-mass energies between 50 and 57 GeV using the AMY detector at TRISTAN. A possible substructure of the electron and muon is investigated in terms of chiral invariant contact interactions and also in terms of excited lepton production. The differential cross section data for e+e-→e+e- are consistent with the standard model at a confidence level of only 3.5%. From the absence of excited lepton production, we establish new upper limits on the coupling to excited electrons of mass up to 56 GeV/c2 and on the coupling to excited muons of mass up to 52 GeV/c2.
| Original language | English |
|---|---|
| Pages (from-to) | 476-484 |
| Number of pages | 9 |
| Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
| Volume | 223 |
| Issue number | 3-4 |
| DOIs | |
| State | Published - 15 Jun 1989 |
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