The anapole form factor of the nucleon is calculated in chiral perturbation theory in leading order. To this order, the form factor originates from the pion cloud, and is proportional to the non-derivative parity-violating pion-nucleon coupling. The momentum dependence of the form factor - and in particular, its radius - is completely determined by the pion mass.
@article{arxiv.hep-ph/0006161,
title = {The anapole form factor of the nucleon},
author = {C. M. Maekawa and U. van Kolck},
journal= {arXiv preprint arXiv:hep-ph/0006161},
year = {2009}
}
Comments
9 pages, 2 eps figures included by epsf.sty, minor changes in note added