  We investigate the discovery potential of the top-quark charge asymmetry at
the LHC in top-antitop production in association with a hard jet. In this
process, the charge asymmetry can be accessed via two novel observables: the
incline asymmetry, which probes the quark-antiquark channel, and the energy
asymmetry, which gives access to the quark-gluon channel. At 8 TeV collision
energy, the significance for both observables is statistically limited. With 14
TeV and an integrated luminosity of 50 inverse fb or more, an asymmetry of up
to -12% can be observed with a statistical significance of more than 5 standard
deviations. Prospects of measuring the charge asymmetry at the intended
high-luminosity and high-energy LHC upgrades are discussed.
