Hard Exclusive Electroproduction of Pions(13)

We investigate the exclusive electroproduction of pi^+ mesons from nucleons. To leading twist, leading order alpha_s accuracy the corresponding production amplitude can be decomposed into pseudovector and pseudoscalar parts. Both can be expressed in terms

ππ+o

Figure3:Ratioofthedi erentialproductioncrosssectionsforexclusiveπ+andπ0productionthroughthescatteringoflongitudinallypolarizedphotonsfromprotonsatt=tminandQ2=10GeV2formodelA.Thedottedcurvecorrespondstothepseudovectorcontributionalone.