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Hadron collisions and the fifth form factor

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arxiv hep-ph/0508130 v2 pith:ZBY34IFW submitted 2005-08-11 hep-ph

classification hep-ph
keywords formeffectsfactorfifthhardscatteringsoftaccompanies
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

Logarithmically enhanced effects due to radiation of soft gluons at large angles in $2\to 2$ QCD scattering processes are treated in terms of the "fifth form factor" that accompanies the four collinear singular Sudakov form factors attached to incoming and outgoing hard partons. Unexpected symmetry under exchange of internal and external variables of the problem is pointed out for the anomalous dimension that governs soft gluon effects in hard gluon--gluon scattering.

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