Two-Gluon Contribution to the Kernel
of the BalitskyFadinKuraevLipatov Equation

M. I. Kotsky, L. N. Lipatov¹⁾, and V. S. Fadin

Budker Institute of Nuclear Physics, Siberian Division, Russian Academy of Sciences,
pr. Akademika Lavrent’eva 11, Novosibirsk, 630090 Russia

Received August 6, 1997

Abstract—The differential cross section for the production of two gluons with a fixed invariant mass in high-
energy parton collisions is expressed in terms of the corresponding cross section for Reggeon–Reggeon inter-
action. The two-gluon contribution to the kernel of the Balitsky–Fadin–Kuraev–Lipatov equation is obtained
by integrating this cross section with respect to the momenta of the product particles. A dimensional regular-
ization is used to eliminate infrared divergences.

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