Article View: sci.physics
Article #850Re: Annihilation?
From: John C. Baez
Date: Fri, 07 Aug 1992 16:10
Date: Fri, 07 Aug 1992 16:10
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In article <12950065@hpspdla.spd.HP.COM> ric@hpspdla.spd.HP.COM (Ric Peregrino) writes: > >Hello sci.physics, > >I'd like to understand electron positron annihilation. I'll just say what >I think I know, and let the net correct me or add info where appropriate. >Spin >conservation has implications on the two cases of incoming spins: > >aligned -> photons have spin 0 and 1 >anti "" -> photons have spin 0 and 0, or 1 and -1 Sorry, photons only have 2 spin states, 1 and -1 (or if you prefer, right and left circularly polarized). That's because they are massless.
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Newsgroups: sci.physics Path: arc1-ca.pugleaf.net!sparky!uunet!snorkelwacker.mit.edu!galois!banach!jbaez From: jbaez@banach.mit.edu (John C. Baez) Subject: Re: Annihilation? Message-ID: <1992Aug7.161055.21138@galois.mit.edu> Sender: news@galois.mit.edu Nntp-Posting-Host: banach Organization: MIT Department of Mathematics, Cambridge, MA References: <12950065@hpspdla.spd.HP.COM> Date: Fri, 7 Aug 92 16:10:55 GMT Lines: 15