Inclusive jet cross section in ${\bar p p}$ collisions at $\sqrt{s}=1.8$ TeV

Abstract

The inclusive jet differential cross section has been measured for jet transverse energies, $E_T$, from 15 to 440 GeV, in the pseudorapidity region 0.1$\leq | η| \leq $0.7. The results are based on 19.5 pb$^{-1}$ of data collected by the CDF collaboration at the Fermilab Tevatron collider. The data are compared with QCD predictions for various sets of parton distribution functions. The cross section for jets with $E_T>200$ GeV is significantly higher than current predictions based on O($α_s^3$) perturbative QCD calculations. Various possible explanations for the high-$E_T$ excess are discussed.

Figures (2)

• Figure 1: The percent difference between the CDF inclusive jet cross section (points) and a next-to-leading order (NLO) QCD prediction using MRSD0$^\prime$ PDFs. The CDF data (points) are compared directly to the NLO QCD prediction (line) in the inset. The normalization shown is absolute. The hatched region at the bottom shows the quadratic sum of correlated systematic uncertainties. NLO QCD predictions using different PDFs are also compared with the one using MRSD0$^\prime$.
• Figure 2: The percentage change in the inclusive jet cross section when various sources of systematic uncertainty are changed by $\pm$1-standard deviation from their nominal values.