I want to calculate the matrix element of Z0 decay into a fermion, antofermion pair given the propagator, vertex element and fermi's golden rule.(adsbygoogle = window.adsbygoogle || []).push({});

But somewthing is going wrong.

First the propagator has a term 1/Mz^2 so

the MatrixElement^2 will go like 1/Mz^4.

but the vertex factor has a term Mz^2 so the matrix element will finally go

1/Mz^2

But according to the answer the matrix element must go like Mz^2 so I'm wrong a factor Mz^4

take a look here;

https://www.physicsforums.com/attachment.php?attachmentid=8956&d=1169839397" [Broken]

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# Calculating z0 decay

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