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Description of an Expression

Mystery111
in Quantum Theory

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I haven't seen this expression before:

 

[math]\frac{-iM\gamma}{\hbar^2k}[/math]

 

Well I can immediately see that [math]\hbar k[/math] is the momentum. What is the gamma here acting coefficient on the imaginary mass?

 

In fact, more generally, what is this expression describing? I am inclined to believe it is simply a momentum, but the gamma is knocking me off: source can be found in the first equation in this link:

 

http://hitoshi.berkeley.edu/221B-S02/sol2.pdf

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