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Article #1245mass definition in particle physics
From: kenton yee
Date: Tue, 14 Apr 1992 20:55
Date: Tue, 14 Apr 1992 20:55
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In article <22637@dog.ee.lbl.gov> sichase@csa1.lbl.gov writes: >>>Brahm at Caltech wrote : >>>Mass is the pole of the propagator. ... >> >I would say that the pole of the propagator is the mass, not the other way >around. You write a wave-equation and solve it for the Green's function. It >turns out that the propagator has a pole when the particle is on-shell. >-Scott The advantage of Scott's viewpoint is that it highlights the hidden assumption that there is a "particle" to talk about. For example, you cannot prove that the full QED electron satisfies the Dirac equation... in perturbation theory one assumes in-out states which do, but that's just a working paradigm, probably incorrect.
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Path: arc1-ca.pugleaf.net!sparky!uunet!decwrl!infopiz!lupine!uupsi!psinntp!bnlux1.bnl.gov!kyee Newsgroups: sci.physics Subject: mass definition in particle physics Message-ID: <1992Apr14.205545.27305@bnlux1.bnl.gov> From: kyee@bnlux1.bnl.gov (kenton yee) Date: 14 Apr 92 20:55:45 GMT References: <10APR199210204620@deimos.ucc.umass.edu> <22637@dog.ee.lbl.gov> Distribution: na Organization: Brookhaven National Laboratory, Upton, NY 11973 Keywords: mass, particle physics Lines: 14