Total-Transverse-Energy Differential Cross-Section
A comparison of the measured and predicted total transverse energy
spectrum provides a test of perturbative QCD that is complementary
to the inclusive-jet transverse-momentum and two-jet mass spectra.
In particular, the total transverse energy in an event explicitly
includes contributions from both the two leading jets in the event and
from any additional jets associated with higher order processes. The
observed spectrum extends up to total transverse energies of about 1.1 TeV.
The NLO QCD predictions appear to underestimate the CDF observed (preliminary)
measurements of the cross-section at the highest total transverse energies.
This trend has also been observed in the preliminary measurements of the
inclusive-jet transverse-momentum differential cross-section
and the two-jet mass differential cross-section.
Log plot: data compared with NLO QCD
Figure caption: CDF differential total transverse energy cross-section
(points) compared with the
JETRAD
order alpha_s^3 QCD prediction (curve) multiplied by a "K-factor" of 1.65.
Linear plot: (data - theory)/theory
Figure caption: Total transverse energy distribution compared with
JETRAD
order alpha_s^3 QCD prediction multiplied by a "K-factor" of 1.65.
(Data - QCD)/QCD is shown (points) as a function of the total transverse energy.
The band shows the experimental correlated systematic uncertainty on the
measurements.
For more information click
here.