J_{E_T}: A Global Jet Finding Algorithm
Abstract
We introduce a new jet-finding algorithm for a hadron collider based on maximizing a J_{E_T} function for all possible combinations of particles in an event. This function prefers a larger value of the jet transverse energy and a smaller value of the jet mass. The jet shape is proved to be a circular cone in Cartesian coordinates with the geometric center shifted from the jet momentum toward the central region. The jet cone size shrinks for a more forward jet. We have implemented our J_{E_T} algorithm with a reasonable running time scaling as N n^3, where "N" is the total number of particles and "n" (much less than N) is the number of particles in a fiducial region. Many features of our J_{E_T} jets are similar to anti-k_t jets, including the reconstructed jet momentum and the "back-reaction" from soft contamination. Nevertheless, when the jet parameters in the two algorithms are matched using QCD jets, we find that the J_{E_T} algorithm has a larger efficiency than anti-k_t for identifying objects with hard splittings such as a W-jet.
Cite
@article{arxiv.1411.3705,
title = {J_{E_T}: A Global Jet Finding Algorithm},
author = {Yang Bai and Zhenyu Han and Ran Lu},
journal= {arXiv preprint arXiv:1411.3705},
year = {2014}
}
Comments
Code available at: https://github.com/LHCJet/JET