Complete one-loop analysis of the Nucleon's spin polarizabilities
We present a complete one-loop analysis of the four nucleon spin polarizabilities in the framework of heavy baryon chiral-perturbation theory. The first nonvanishing contributions to the isovector and first corrections to the isoscalar spin polarizabilities are calculated. No unknown parameters enter these predictions. We compare our results to various dispersive analyses. We also discuss the convergence of the chiral expansion and the role of the delta isobar.
Gellas
GC
Forschungszentrum Julich, Institut fur Kernphysik (Theorie), D-52425 Julich, Germany.
Hemmert
TR
Meissner
UG