PT Journal
AU Hiller Blin, AN
   Gutsche, T
   Ledwig, T
   Lyubovitskij, VE
TI Hyperon forward spin polarizability gamma(0) in baryon chiral perturbation theory
SO Physical Review D
JI Phys. Rev. D
PY 2015
BP 096004
EP 9pp
VL 92
IS 9
DI 10.1103/PhysRevD.92.096004
LA English
AB We present the calculation of the hyperon forward spin polarizability gamma(0) using manifestly Lorentz-covariant baryon chiral perturbation theory including the intermediate contribution of the spin-3/2 states. As at the considered order the extraction of. 0 is a pure prediction of chiral perturbation theory, the obtained values are a good test for this theory. After including explicitly the decuplet states, our SU(2) results have a very good agreement with the experimental data and we extend our framework to SU(3) to give predictions for the hyperons'. 0 values. Prominent are the Sigma(-) and Xi(-) baryons as their photon transition to the decuplet is forbidden in SU(3) symmetry and therefore they are not sensitive to the explicit inclusion of the decuplet in the theory.
ER