The Ratio of Jet Cross Sections at s**(1/2)=630 GeV and 1800 GeV

TL;DR

This paper measures the ratio of inclusive jet cross sections in proton-antiproton collisions at two different energies, comparing results with QCD predictions and finding good agreement in the ratio's dependence on jet transverse momentum.

Contribution

It provides the first combined ratio measurement of jet cross sections at 630 GeV and 1800 GeV, reducing uncertainties and testing QCD predictions.

Findings

QCD predictions agree well with the 630 GeV data

The ratio of cross sections matches theoretical expectations

The ratio's dependence on jet transverse momentum is consistent with theory

Abstract

The DO Collaboration has measured the inclusive jet cross section in proton-antiproton collisions at s**2 = 630 GeV. The results for pseudorapidities -0.5 to 0.5 are combined with our previous results at s**2 = 1800 GeV to form a ratio of cross sections with smaller uncertainties than either individual measurement. Next-to-leading-order QCD predictions show excellent agreement with the measurement at 630 GeV; agreement is also satisfactory for the ratio. Specifically, despite a 10% to 15% difference in the absolute normalization, the dependence of the ratio on jet transverse momentum is very similar for data and theory.