## rates

Posted May4-12 at 01:39 PM by Ai52487963
Updated May4-12 at 01:56 PM by Ai52487963

$$R = \frac{\sigma(e^+ P^+ \rightarrow C)}{\sigma(e^+ P^+ \rightarrow \bar{\nu}_e)}$$

We know the proton composition is UUD and the reaction is a scattering and not a decay. So the positron has to scatter off one of the constituent quarks in the proton to produce either a charm quark or a neutrino. We know that lepton number and presumably quark number have to be preserved at each vertex as well.

A Feynman diagram (dunno how to draw here) would be one of those vertical...
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