Electromagnetic gauge invariance and composite mesons
Journal Article
·
· Bulletin of the American Physical Society
OSTI ID:243667
Gauge invariance requires that the photon-meson vertex be related to the meson inverse propagator through a Ward-Takahashi identity. Here the author derives the explicit form this identity takes for composite q{bar q} pions at the ladder Bethe-Salpeter level. The composite fields, their propagators, and photon couplings are built from the quark level according to the global color symmetry model of QCD. The contribution beyond the usual point form is related to the ability of the meson internal structure to absorb momentum.
- OSTI ID:
- 243667
- Report Number(s):
- CONF-9304297--; CNN: Grant PHY91-13117; Grant HRD-9154080
- Journal Information:
- Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 2 Vol. 38; ISSN 0003-0503; ISSN BAPSA6
- Country of Publication:
- United States
- Language:
- English
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