Definition of Total Transverse Energy
The CDF definition of the total transverse energy (Total-Et) exploits the
cell structure of the CDF calorimeters. To obtain more information on the
CDF detector click
here.
In the following the transverse energy (Et) is defined: Et = E sin(theta),
where E is the jet (or calorimeter cell) energy and theta is the angle between
the beam direction and the direction of the jet (or vector pointing from the
interaction vertex to the calorimeter cell). In the 1988/9 data sample the
Total-Et was defined as a sum over calorimeter cell Et, and the definition
was therefore independent of the "jettiness" of an event. In the 1992/3 data
taking period the luminosity of the Tevatron collider was sufficiently large
that the contribution from multiple interactions became significant if the
1988/9 definition of Total-Et was used. To overcome this difficulty, the 1992/3
definition of Total-Et is based on a sum over the Et of jets.
1992/3 Definition of Total Transverse Energy
Total-Et is defined as the scalar sum of the transverse-energies (Et) of all
jets with Et > 20 GeV reconstructed in the CDF calorimeters. Jets are reconstructed
using the CDF jet reconstruction algorithm with a cone radius of 0.7 in
(pseudorapidity, azimuthal-angle)-space.
1988/9 Definition of Total Transverse Energy
Total-Et is defined as the scalar sum of the transverse-energies (Et)
recorded in all the calorimeter cells of the CDF detector in which
Et exceeds 500 MeV.