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Stewart V. Wright

University of Liverpool, UK
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Chiral PerturbationTheory, Models, and the Lattice: Different views, the same
physics

Consideration of the analytic properties of pion-induced
hadron self-energies leads to new functional forms for the
extrapolation of light hadron masses. These functional forms
reproduce the leading non-analytic behaviour of chiral perturbation
theory, the correct non-analytic behaviour at the hadron-pion
threshold and the appropriate heavy-quark limit. The parameters in
these forms may be obtained by fitting to available lattice data. We
have used these functions to examine the systematic error of
traditional naive extrapolations, probe the limit of applicability of
chiral perturbation theory and to compare with model predictions.

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