- #1

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I tried to do as following,

find out the value of |M

_{W}|

^{2}, |M

_{Z}|

^{2}and 2 M

_{W}* M

_{Z}and add them. The |M

_{W}|

^{2}and the |M

_{Z}|

^{2}were lengthy but easy, but the Interference Term 2 M

_{W}* M

_{Z}I was unable to calculate even after applying Fierz Rearrangement.

Since to apply Fierz Rearrangement one Lorentz index in the gamma matrix should be in the upper position and the same index should be lowered in another gamma matrix.

But, in my case, I had 4 gamma matrix with all the Lorentz index is in the upper position and I could not lower them using Metric Tensor

* What should I do to calculate this invariant amplitude?

* Where can I find out any kind of hints and results of this calculation?

* Is my approach to solving the problem wrong?

* I am new in this Forum, so I don't know the perfect people who can help me. If someone can suggest me who can help, It will be a pleasure.

* Sorry for my poor way of describing the problem. i tried to insert some images but I just failed.