Hard exclusive meson production and nonforward parton distributions

L. Mankiewicz, G. Piller, T. Weigl
1998 European Physical Journal C: Particles and Fields  
We present an analysis of twist-2, leading order QCD amplitudes for hard exclusive leptoproduction of mesons in terms of double/nonforward parton distribution functions. After reviewing some general features of nonforward nucleon matrix elements of twist-2 QCD string operators, we propose a phenomenological model for quark and gluon nonforward distribution functions. The corresponding QCD evolution equations are solved in the leading logarithmic approximation for flavor nonsinglet
more » ... nglet distributions. We derive explicit expressions for hard exclusive pi^0, eta, and neutral vector meson production amplitudes and discuss general features of the corresponding cross sections.
doi:10.1007/s100520050253 fatcat:q7tp4h2ewfaddc5vxmgmhkoqha