# I Time invariance of weak interaciton e-p->\nu n

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1. Jun 26, 2017

### Phizzzzzik

The question is rather simple, but I cannot seem to find a solid answer. I need the cross section of the following interaction:
$$e^- + p\rightarrow n+ \nu .$$
I need the cross section using the form factors. There are many solutions for the interactions like:
$$n+ \nu\rightarrow e^- + p$$
or
$$p+\overline{\nu}\rightarrow e^+ + n,$$
but I am not sure which one of them is the right one for my case. I know that the lepton current is not T-invariant and I think that hadronic is, but I am not sure. I would be really thankful for some short explanation.

2. Jul 1, 2017

### PF_Help_Bot

Thanks for the thread! 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? The more details the better.