# W boson decay

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1. Feb 1, 2016

### andrex904

Hi, i'm trying to compute the differential decay of W boson at rest
$$W^+ \rightarrow e^+ \nu_e$$
where the boson has fixed spin along z axis, and so specific cirular polarization. Using Feynman rules i get
$$M=\frac{ig_w}{\sqrt{2}}\bar{u}(q)\gamma^\mu(\frac{1-\gamma_5}{2})v(k)\epsilon_\mu^\lambda(p)$$
and i'm in trouble with a term coming from trace
$\varepsilon^{\alpha \mu \beta \nu} q_\alpha k_\beta$ $\epsilon^\lambda_\mu$ $\epsilon^{*\lambda}_\nu$
where $\varepsilon$ is the Levi-Civita symbol.

2. Feb 6, 2016

### Staff: Admin

Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?

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