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The European Physical Journal C
ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)
Abstract Volume 5 Issue 1 (1998) pp 119-128
DOI 10.1007/s100529800829
theoretical physics:
Hard exclusive meson production and nonforward parton distributions
L. Mankiewicz (a), G. Piller, T. Weigl
Physik Department, Technische Universität München, D-85747 Garching, Germany
Received: 12 November 1997 / Published online: 26 February 1998
Abstract. 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 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.
(a) On leave of absence from N. Copernicus Astronomical Center, Polish Academy of Science, ul. Bartycka 18, PL-00-716 Warsaw (Poland)
Article in PDF-Format (351 KB)
Article in (gzipped) PS-Format (207 KB)
Online publication: August 4, 1998
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