pp ->  W  -> ln
Production:
QCD
Mirkes et al.
NLO:  DmW = 40MeV
           smW ~ 10MeV
Decay:
EW
Baer et al.
NLO: DmW = 100s MeV
           smW ~ 20MeV
Factorisable?
O(aSaem) calculation?
How to test?