content_image/311059.jpg content_image/311060.jpg content_image/311061.jpg content_image/311062.jpg
from the previous section. One finds that 

The result for Eq. (E.28) expanded to first order in 1 /E + is 

<img src='content_image/311059.jpg'>

<img src='content_image/311060.jpg'>

<img src='content_image/311061.jpg'>

<img src='content_image/311062.jpg'>

There are three differences between Eq. (E.58) and Eq. (E.62): the addi- tional overall factor of (1 − x ) 2 in Eq. (E.62), (1 − x ) 2 in Eq. (E.62) instead of 1 − x in Eq. (E.58) as the coefficient of m 2 γ in the denominator, and the additional (1 − x ) $^{2}$m2 γ in the numerator of Eq. (E.62). In the limit of small x for which the calculations are valid, the first two disappear; however the third is a true inconsistency. In the following Appendix we will find that the second is due to including the mass of the gluon from the k 2 term in the denominator of the quark propagator and that the first and third are due to the interference terms from the away-side jet. 

