Abstract

CAVALCANTE, I. P. et al. Nucleon and delta sigma-terms. Braz. J. Phys. [online]. 2007, vol.37, n.1a, pp. 84-91. ISSN 0103-9733.  http://dx.doi.org/10.1590/S0103-97332007000100026.

We evaluate nucleon and delta sigma-terms and obtain the results 43 MeV  < s_N <  49 MeV and 28 MeV  < s_D <  32 MeV, depending on the coupling constants used, which are compatible with values extracted from experiment and produced by other groups. We show that the decay D ® pN explains the relation s_D < s_N.

Keywords : Nucleon and delta sigma terms; Delta decay; Effective theories.