Factorization, power corrections, and the pion form factor

This paper is an investigation of the pion form factor utilizing recently developed effective field theory techniques. The primary results reported are both the transition and electromagnetic form factors are corrected at order Lambda/Q due to time ordered products which account for deviations of the pion from being a state composed purely of highly energetic collinear quarks in the lab frame. The usual higher twist wave function corrections contribute only at order Lambda(2)/Q(2), when the quark mass vanishes. In the case of the electromagnetic form factor the Lambda/Q power correction is enhanced by a power of 1/alpha(s)(Q) relative to the leading order result of Brodsky and Lepage, if the scale rootLambdaQ is nonperturbative. This enhanced correction could explain the discrepancy with the data.