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 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 \( {J}_{E_T} \) 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.
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ArXiv ePrint: 1411.3705
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Bai, Y., Han, Z. & Lu, R. \( {J}_{E_T} \): a global jet finding algorithm. J. High Energ. Phys. 2015, 102 (2015). https://doi.org/10.1007/JHEP03(2015)102
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DOI: https://doi.org/10.1007/JHEP03(2015)102