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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?

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Welcome to Physics.SE! We have the MathJax rendering engine active on the site, so you can write math in LaTeX. I've done some this one for you. –  dmckee Jan 15 '12 at 16:48

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