Re: particle physics


Posted by Pasti on Apr 07, 2004 at 11:38
(64.231.233.118)

Re: particle physics (Ashok Narayan)

Well,there is a good reason why you haven't heard of this reaction.Or it's inverse.

Photons are quanta of the electromagnetic field, and the electromagnetic field is produced by electrically charged particles.

On the other hand, neutrinos, as the name implies, are neutral leptons, si they cannot generate electromagnetic field.In other words, they cannot couple at the vertex with a photon.This in spite of the fact that leptonic number is conserved in the neutrino-antineutrino process that you mention.

The only QCD vertex that I know of, involving two neutrinos (in fact, only one neutrino that goes in and then out)is the vertex where the neutrinos couple to a Z0 particle.But this does not mean that there are two neutrinos interacting, it only means that a neutrino spontaneously emits a Z0 in its way, and couples to whatever other allowed vertex.


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