Authors: Jeppe R. Andersen and Jennifer M. Smillie
High Energy Jets is an implementation in a partonic Monte Carlo generator of an exclusive, all-order summation of the perturbative terms dominating the production of well-separated multiple jets at hadron colliders. The all-order treatment generates a contribution from any number of hard jets (greater than 2), and all jet rates (up to a total of 4 jets) are fully matched to tree-level accuracy.
The acronym HEJ is pronounced much like 'hi' or 'high'.
The implementation of HEJ is distributed under the the conditions in the GNU General Public License (GNU GPL) and the MCnet guidelines. Please see the section on publications for guidance on how to cite HEJ.
The formalism is being implemented for several processes. In Multiple Jets at the LHC with High Energy Jets (arXiv:1101.5394), we present the HEJ generator for pure multi-jet processes (di-jet, tri-jet,...), and discuss the impact of the radiative corrections on several important observables used in search strategies for New Physics.
In A Parton Shower for High Energy Jets (arXiv:1104.1316), we present a consistent formalism to merge the resummation within HEJ with that of a parton shower. This allows the production of fully hadronised events.
W Plus Multiple Jets at the LHC with High Energy Jets applies the formalism of HEJ to the process of W-production in association with at least two jets. Predictions are compared to ATLAS data, and the impact of the large effects systematically accounted for is detailed.
The formalism applied to dijet (or more) production, and for Higgs- or W-boson production in association with at least two jets is available in a fully flexible Monte Carlo generator, downloadable from the section Installation.