The book "Collider Physics", by barger and Phillips, deals with hadronic W and Z productions, and includes the $K$ factor which represents QCD corrections.
However, when dealing with the hadronic process
$$\bar{u} d \to W \to e \nu$$
and then later with the inclusive
$$AB \to e \nu X,$$ (pg. 248, 255)
it does not include the $K$ factor.
It does, however, again includes the $K$ factor on pg. 260, when dealing with transverse mass.
Is this simply an error or is there a reason for this?
