UNSPECIFIED (1996) A study of single and multi-photon production in e+e− collisions at centre-of-mass energies of 130 and 136 GeV. Physics Letters B, 384 (1-4). pp. 333-342. ISSN 0370-2693
Full text not available from this repository.Abstract
The production of final states involving one or more energetic photons from e+e− collisions at high energies is studied using data collected by the ALEPH detector at LEP. The data consist of two samples of 2.9 pb−1 each, recorded at centre-of-mass energies of 130 GeV and 136 GeV. The data are in agreement with the predictions of the Standard Model. From an analysis of two-photon final states new limits are placed on the parameters of models involving e+e−γγ contact interactions and excited electrons. The 95% confidence level lower limits on the QED cut-off parameters Λ+ and Λ− are found to be 169 and 132 GeV respectively.