Abstract
The properties of hadronic Z0 decays with final state photons, measured with OPAL at LEP, have been compared with predictions from two different matrix element calculations ofO(αα s ). Two calculations, GNJETS and EEPRAD, have been investigated which use different schemes to restrict the phase space around the poles of the cross section. Assuming the E0-JADE jet definition, both calculations describe the data well in large regions of phase space fory cut values around 0.06. For very large and very small jet-photon masses some deviations from the predictions have been found, indicating the importance of higher order corrections. Significant differences between the calculations are only apparent in the predicted rate of 1-jet plus photon events. The rate is higher in GNJETS which reproduces the data better than EEPRAD.
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OPAL Collaboration., Akers, R., Alexander, G. et al. Comparisons of the properties of final state photons in hadronic Z0 decays with predictions from matrix element calculations. Z. Phys. C - Particles and Fields 67, 15–26 (1995). https://doi.org/10.1007/BF01564818
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DOI: https://doi.org/10.1007/BF01564818