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.Comment: 9 pages, 2 eps figures included by epsf.sty, minor changes in note
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