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We examine dijet production at large rapidity intervals at Tevatron energiesby comparing an exact ${\cal O}(\alpha_s^3)$ calculation with the BFKLapproximation, which resums the leading powers of the rapidity interval $y$ toall orders in $\alpha_s$. We analyze the dependence of the exact ${\calO}(\alpha_s^3)$ calculation on the jet cone-size as a function of $y$, and usethis cross section to define an ``effective rapidity'' $\hat y$ which reducesthe error that the large-$y$ approximation induces on the kinematics. Using$\hat y$ in the BFKL resummation, we reexamine jet production at largetransverse momenta and the transverse momentum decorrelation of the taggingjets. We find less dramatic, but still significant, effects than foundpreviously using the large-$y$ approximation.Comment: 23 pages (6 uu-compressed encapsulated PS figures appended), DESY  94-114, SCIPP 94/1

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Balitsky-Fadin-Kuraev-Lipatov approximation versus<i>O</i>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi mathvariant="normal">α</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">s</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msubsup></mml:mrow></mml:math>) corrections to large-rapidity dijet production

Balitsky-Fadin-Kuraev-Lipatov approximation versusO(αs3) corrections to large-rapidity dijet production