2003/10/31 by Fabio L. Braghin
Physics and Astronomy · #hep-lat
published as Braz.J.Phys. 34 (2004) 243-246 · five pages, Contribution for the Proceedings of the Meeting on Hadronic Interactions, Mackenzie University, São Paulo, SP, Brazil, May 2003
arxiv created 2003/10/31 · arxiv updated 2009/12/01
The relevance of the pion mass, provenient from a term which explicitely breaks chiral symmetry in the Lagrangian, for nucleon magnetic moment in the frame of the Skyrmion model in two different versions: the usual Skyrme model and a modified one which includes a coupling to a light scalar meson field, the sigma σ(≃ 500-600 MeV). The results are compared to other calculations. Our main motivation comes from usual extrapolations for values of low energy QCD observables obtained in lattices with large values of pion/quark masses toward realistic value of mπ. which do not allow it. We do a comparison with results from the Cloudy Bag Model and a chiral hadronic model from chiral perturbation theory. There are several resulting extrapolations from the region of large pion mass to the realistic value depending on the considered model for low energy QCD.