Tagging highly boosted top quarks

S. Schätzel, M. Spannowsky
2014 Physical Review D  
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
more » ... 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.
doi:10.1103/physrevd.89.014007 fatcat:6etux5zwjjaujlnrp2kp3n4jzy