Tevatron ttx asymmetry
The original asymmetry paper by Kuhn and Rodrigo, "Charge asymmetry of heavy
quarks at hadron colliders"
http://xxx.lanl.gov/abs/hep-ph/9807420
NNLO soft gluon corrections to ttx pair productionn cross-section at Tevatron
and LHC
http://xxx.lanl.gov/abs/hep-ph/0308222