Abstract
We derive expressions for pion photoproduction amplitudes in the 1/N c expansion of QCD, and obtain linear relations directly from this expansion that relate electromagnetic multipole amplitudes at all energies. The leading-order relations in 1/Nc compare favorably with available data, while the next-to-leading-order relations seem to provide only a small improvement. However, when resonance parameters are compared directly, the agreement at O(1/Nc) or O(1/Nc2) is impressive.
| Original language | English (US) |
|---|---|
| Article number | 076010 |
| Pages (from-to) | 1-12 |
| Number of pages | 12 |
| Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |
| Volume | 71 |
| Issue number | 7 |
| DOIs | |
| State | Published - Apr 1 2005 |
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)
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Cohen, T. D., Dakin, D. C., Lebed, R., & Martin, D. R. (2005). Pion photoproduction amplitude relations in the 1/Nc expansion. Physical Review D - Particles, Fields, Gravitation and Cosmology, 71(7), 1-12. [076010]. https://doi.org/10.1103/PhysRevD.71.076010