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

TL;DR

This paper reports a measurement of the inclusive jet cross section in proton-antiproton collisions at 1.8 TeV, revealing a significant excess at high transverse energies compared to QCD predictions, prompting discussions on potential explanations.

Contribution

First measurement of jet cross sections over a wide energy range at 1.8 TeV, highlighting discrepancies with existing QCD models at high energies.

Findings

Jet cross section measured from 15 to 440 GeV

Significant excess observed for E_T > 200 GeV

Discrepancy with perturbative QCD predictions

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 | \eta| \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($\alpha_s^3$) perturbative QCD calculations. Various possible explanations for the high-$E_T$ excess are discussed.