Axial current conservation in nonrelativistic nuclear physics: The nonlinear sigma model
We analyze partially conserved axial current in the nonlinear realization of chiral symmetry in nuclear physics. We construct the two-nucleon (meson-exchange) axial currents and associated pion emission and absorption operators and compare them with those derived earlier in the linear sigma model. We show the absence of necessity of meson-exchange currents in the nonlinear model, in contrast with the linear one.
Извор:Physical Review C, 2002, 65, 4
ISSN: 2469-9985 (print); 2469-9993 (electronic)