Probing BFKL Dynamics in the Dijet Cross Section at Large Rapidity Intervals in ppbar Collisions at sqrt{s}=1800 and 630 GeV

TL;DR

This paper measures the dijet cross section at large pseudorapidity intervals in proton-antiproton collisions, providing insights into BFKL dynamics and observing a stronger growth than predicted by leading logarithmic approximation.

Contribution

It presents the first measurement of the dijet cross section at large rapidity intervals at two different energies, testing BFKL predictions in a new regime.

Findings

Partonic cross section increases with delta_eta.

Observed growth exceeds BFKL leading logarithmic predictions.

Effective BFKL intercept measured as 1.65±0.07.

Abstract

Inclusive dijet production at large pseudorapidity intervals (delta_eta) between the two jets has been suggested as a regime for observing BFKL dynamics. We have measured the dijet cross section for large delta_eta in ppbar collisions at sqrt{s}=1800 and 630 GeV using the DO detector. The partonic cross section increases strongly with the size of delta_eta. The observed growth is even stronger than expected on the basis of BFKL resummation in the leading logarithmic approximation. The growth of the partonic cross section can be accommodated with an effective BFKL intercept of a_{BFKL}(20GeV)=1.65+/-0.07.