Round Table Discussion on Direct Photons
Beautiful experimental and theoretical work has been presented at this workshop. The experiments are very difficult, as can be inferred from the large systematic errors generally quoted. Nevertheless, six of the following methods for measuring prompt photons have been reported, and all have provided impressive results:
Highly granular detectors with excellent spatial and energy resolutions: R806 and follow ups, NA3, NA24, WA70, UA6, E705, E706.
Detectors relying on the statistical method for determining the probability of conversion of one and two photon clusters: R108, UA2.
Pair spectrometer utilizing an extended-conversion technique: NA3.
A method based on internal conversion of low mass muon pairs: UA1.
Measurement of lateral shower structure after converter: R110.
The statistical method, using accompanying energy in the cone and information on the shape of longitudinal energy deposition: UA1.
KeywordsParton Distribution Deep Inelastic Scattering Compton Scattering Gluon Distribution Prompt Photon
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