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We demonstrate, to next-to-leading order accuracy, the cancellation of theinfrared singularities in the impact factors which arise in the QCD descriptionof high energy processes A + B -> A' + B' of colourless particles. We study theexample where A is a virtual photon in detail, but show that the result is truein general.Comment: 31 pages latex including 10 figure

Infrared safety of impact factors for colorless particle interactions