  For highly energetic top quarks, the products of the decay t->bqq' are
collimated. The 3-prong decay structure can no longer be resolved using
calorimeter information alone if the particle jet separation approaches the
calorimeter granularity. We propose a new method, the HPTTopTagger, that uses
tracks of charged particles inside a fat jet to find top quarks with transverse
momentum pT >1 TeV. The tracking information is complemented by the calorimeter
measurement of the fat jet energy to eliminate the sensitivity to jet-to-jet
fluctuations in the charged-to-neutral particle ratio. We show that with the
HPTTopTagger, a leptophobic narrow-mass Z' boson of mass 3 TeV could be found
using 300/fb of 14 TeV LHC data.
