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JET : a global jet finding algorithm
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DOI：10.1007/JHEP03(2015)102.png)
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Abstract
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We introduce a new jet-finding algorithm for a hadron collider based on maximizing a J(ET) 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(ET) algorithm with a reasonable running time scaling as Nn(3), where N is the total number of particles and n (<< N) is the number of particles in a fiducial region. Many features of our J(ET) 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(ET) algorithm has a larger efficiency than anti-k(t) for identifying objects with hard splittings such as a W-jet.
Keywords:
Jets
Hadronic Colliders
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