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The detailed proof of cancellation of topologically unfactorized infrareddivergences in the inclusive production of lepton pair close to the thresholdof heavy quarkonia is presented. To make the effects of transition betweenstates containing heavy quark pairs, which is important in such cancellation,the final detected states are constrained to be lepton pair near the thresholdof the heavy quarkonia instead of heavy quarkonia themselves. Such cancellationis crucial for the NRQCD factorization of these processes.

Cancellation of Infrared Divergence in Inclusive Production of Lepton Pair Near the Threshold of Heavy Quarkonia