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- W169252012 abstract "I discuss a degree of freedom in formulating perturbation theory that is often neglected: the in- and out-states need not be empty. The inclusion of (free) particles in the asymptotic states modifies the on-shell prescription of the free propagator. This affects loop contributions -- but the modified expansion is {it a priori} as justified as the standard one with Feynman prescription. It is possible to dress the quark propagator to all orders with zero-momentum gluons from the perturbative ground state. The dressed quark has no pole and thus cannot appear as an external particle in the S-matrix. Chiral symmetry may be spontaneously broken, but Lorentz and gauge symmetry is exact. Adding loop corrections to this ``dressed tree approximation'' gives a formally exact PQCD expansion." @default.
- W169252012 created "2016-06-24" @default.
- W169252012 creator A5083575147 @default.
- W169252012 date "2003-04-02" @default.
- W169252012 modified "2023-09-27" @default.
- W169252012 title "Filling Perturbative Ground States" @default.
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