Calculation of the axial charge in the γ and γ^{'} regimes of heavybaryon chiral perturbation theory
Abstract
The axial charge g_{A} is calculated in the γ regime of heavybaryon chiral perturbation theory to order γ^{3}. To perform this calculation, we develop a technique to compute baryon properties in the γ regime of chiral perturbation theory. This technique includes contributions from pion zero momentum modes and can be used at arbitrary order, diagram by diagram, in the γ regime to calculate any matrix element. Also, a calculation of g_{A} in the γ^{'} regime to order γ^{'3} is performed. A discussion of the domain of applicability for both the γ and γ^{'} regimes is also included.
 Publication:

Physical Review D
 Pub Date:
 October 2007
 DOI:
 10.1103/PhysRevD.76.074503
 arXiv:
 arXiv:0706.3731
 Bibcode:
 2007PhRvD..76g4503S
 Keywords:

 12.38.Gc;
 12.39.Fe;
 Lattice QCD calculations;
 Chiral Lagrangians;
 High Energy Physics  Lattice
 EPrint:
 24 pgs., added references, fixed typos