TY - JOUR
T1 - Pion photoproduction amplitude relations in the 1/Nc expansion
AU - Cohen, Thomas D.
AU - Dakin, Daniel C.
AU - Lebed, Richard
AU - Martin, Daniel R.
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2005/4/1
Y1 - 2005/4/1
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevD.71.076010
DO - 10.1103/PhysRevD.71.076010
M3 - Article
AN - SCOPUS:18444405206
VL - 71
SP - 1
EP - 12
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
SN - 1550-7998
IS - 7
M1 - 076010
ER -