In Muon decay, the decay width is:(adsbygoogle = window.adsbygoogle || []).push({});

[itex]\Gamma[/itex]_{[itex]\mu[/itex]}= hbar/[itex]\tau[/itex]_{[itex]\mu[/itex]}= G_{F}² / (192π³(hbar.c)^{6}) . (m_{[itex]\mu[/itex]}c²)^{5}(1+[itex]\epsilon[/itex])

It's this (m_{[itex]\mu[/itex]}c²)^{5}that bothers me.. How do you decide the powers in other reactions? I know it has something to do with the degrees of freedom, but I don't know how.

Also: what would be the answer to following question?

p^{+}+ p^{-}-> top particles.

The decay width will go according to G_{F}.(M_{t})^{x}

What is the value of x?

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# Energy powers in decay widths

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