PT Journal
AU Pich, A
   Rosell, I
   Sanz-Cillero, JJ
TI The vector form factor at the next-to-leading order in 1/N-C: chiral couplings L-9(mu) and C-88(mu)-C-90(mu)
SO Journal of High Energy Physics
JI J. High Energy Phys.
PY 2011
BP 109
EP 23pp
VL 02
IS 2
DI 10.1007/JHEP02(2011)109
LA English
DE 1/N Expansion; Chiral Lagrangians; QCD
AB Using the Resonance Chiral Theory Lagrangian, we perform a calculation of the vector form factor of the pion at the next-to-leading order (NLO) in the 1/N-C expansion. Imposing the correct QCD short-distance constraints, one fixes the amplitude in terms of the pion decay constant F and resonance masses. Its low momentum expansion determines then the corresponding O(p(4)) and O(p(6)) low-energy chiral couplings at NLO, keeping control of their renormalization scale dependence. At mu(0) = 0.77 GeV, we obtain L-9(mu(0)) = (7.9 +/- 0.4).10(-3) and C-88(mu(0)) – C-90(mu(0)) = (-4.6 +/- 0.4).10(-5).
ER