Abstract
We derive expressions for pion electroproduction amplitudes in the 1/Nc expansion of QCD, and obtain from them linear relations between the electromagnetic multipole amplitudes that hold at all energies. The leading-order relations in 1/Nc compare favorably with available data (especially away from resonances), but the next-to-leading-order relations tend to provide only small or no improvement.
| Original language | English (US) |
|---|---|
| Article number | 076006 |
| Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |
| Volume | 80 |
| Issue number | 7 |
| DOIs | |
| State | Published - Oct 16 2009 |
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)
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