POWER CORRECTIONS AND THE GAUSSIAN FORM OF THE MESON WAVE-FUNCTION - ART. NO. 013011

The wave function of a light pseudoscalar meson is considered and nonp erturbative corrections as signaled by perturbation theory are calcula ted. Two schemes are used: the massive gluon and the running coupling scheme. Both indicate the presence of leading power corrections of O(b (2)), whose exponentiation leads to a Gaussian dependence of the wave function on the impact parameter b. The dependence of this correction on the light cone energy fractions of the quark and the antiquark is d iscussed and compared with other models for the meson. [S0556-2821(98) 04113-7].