Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-03-27
Phys.Rev.D58:094025,1998
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, LaTex, 2 eps figures, few modifications in the text, results unchanged
Scientific paper
10.1103/PhysRevD.58.094025
We study the production of isolated photons in $e^+e^-$ annihilation and give the proof of the all-order factorization of the collinear singularities. These singularities are absorbed in the standard fragmentation functions of partons into a photon, while the effects of the isolation are consistently included in the short-distance cross section. We compute this cross section at order $\as$ and show that it contains large double logarithms of the isolation parameters. We explain the physical origin of these logarithms and discuss the possibility to resum them to all orders in $\as$.
Catani Stefano
Fontannaz Michel
Pilon Eric
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