Ewn. Glover et Ag. Morgan, THE PHOTON PLUS 1 JET EVENT RATE WITH THE CONE ALGORITHM IN HADRONIC EVENTS AT LEP, Physics letters. Section B, 334(1-2), 1994, pp. 208-214
Using the recently measured photon fragmentation function, we make pre
dictions for 'isolated' photon +1 jet events using a cone type algorit
hm at LEP energies. For small cone half-angles, perturbation theory br
eaks down due to the presence of large logarithms. Furthermore, large
hadronisation corrections are present. We suggest a definition of an '
isolated' photon which avoids these problems at small cone sizes and c
an be extrapolated to the reliably calculated large cone region.