Citation
D. Buskulic et al., A STUDY OF SINGLE AND MULTIPHOTON PRODUCTION IN E(-) COLLISIONS AT CENTER-OF-MASS ENERGIES OF 130 AND 136 GEV()E(), Physics letters. Section B, 384(1-4), 1996, pp. 333-342
Abstract
The production of final states involving one or more energetic photons
from e(+)e(-) collisions at high energies is studied using data colle
cted 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 13
6 GeV. The data are in agreement with the predictions of the Standard
Model. From an analysis of two-photon final states new limits are plac
ed on the parameters of models involving e(+)e(-)gamma gamma contact i
nteractions and excited electrons. The 95% confidence level lower limi
ts on the QED cut-off parameters Lambda(+) and Lambda(-) are found to
be 169 and 132 GeV respectively.