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From: matt@oddjob.UChicago.UUCP (Matt Crawford)
Newsgroups: net.physics
Subject: Feynman diagram question -- for experts
Message-ID: <378@oddjob.UChicago.UUCP>
Date: Wed, 22-Aug-84 00:03:54 EDT
Article-I.D.: oddjob.378
Posted: Wed Aug 22 00:03:54 1984
Date-Received: Thu, 16-Aug-84 07:20:25 EDT
Organization: U. Chicago: Astronomy & Astrophysics
Lines: 7

Is there a way I can just look at a term in the interaction lagrangian and
know for certain whether the corresponding vertex should have a +i or a -i
multiplying the coupling?  Assume, of course, that I know the spins of all
the fields, and the signature of the metric being used.
___________________________________________________________
Matt		University	ARPA: crawford@anl-mcs.arpa
Crawford	of Chicago	UUCP: ihnp4!oddjob!matt