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The wave function of a light pseudoscalar meson is considered andnonperturbative corrections as signaled by perturbation theory are calculated.Two schemes are used, the massive gluon and the running coupling scheme. Bothindicate the presence of leading power corrections of ${\cal O}(b^2)$, whoseexponentiation leads to a Gaussian dependence of the wave function on theimpact parameter $b$. The dependence of this correction on the light coneenergy fractions of the quark and the antiquark is discussed and compared withother models for the meson.Comment: 15 pp, Latex, 2 figures, uses axodraw. Discussion of comparison with  other models modified. One reference adde

Power corrections and the Gaussian form of the meson wave function