Friday, October 19, 2012

1210.5072 (P. Wang et al.)

Chiral extrapolation of nucleon magnetic moments at
next-to-leading-order
   [PDF]

P. Wang, D. B. Leinweber, A. W. Thomas, R. D. Young
Nucleon magnetic moments display a rich nonanalytic dependence on the quark mass in both quenched and full QCD. They provide a forum for a detailed examination of the connection between quenched and full QCD made possible through the formalism of finite-range regularised chiral effective field theory. By defining meson-cloud and core contributions through the careful selection of a regularisation scale, one can correct the meson cloud of quenched QCD to make full QCD predictions. Whereas past success is based on unquenching the leading-order loop contributions, here we extend and test the formalism including next to leading-order (NLO) loop contributions. We discuss the subtleties associated with working at NLO and illustrate the role of higher-order corrections.
View original: http://arxiv.org/abs/1210.5072

No comments:

Post a Comment