  A new heavy di-jet resonance could be discovered at the 14 TeV LHC. In this
talk we present a strategy to reveal the nature of such a particle; in
particular to discern whether it is a quark-antiquark (q qbar), quark-gluon
(qg), or gluon-gluon (gg) resonance. The strategy is based on the study of the
energy profiles of the two leading jets in the di-jet channel. Including
statistical uncertainties in the signal and the QCD backgrounds, we show that
one can distinguish between gg, qg, and q bar resonances; an evaluation of
systematic uncertainties in the measurement of the jet energy profile will
require a detailed detector study once sufficient 14 TeV di-jet data is in
hand.
