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Factorization for hard exclusive electroproduction of mesons in QCD

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arxiv hep-ph/9611433 v4 pith:5RN5WZAX submitted 1996-11-26 hep-ph

John C. Collins , Leonid Frankfurt , Mark Strikman This is my paper · ORCID
classification hep-ph
keywords mesonsdensitypartondeltadensitieselectroproductionexclusivefactorization
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We formulate and prove a QCD factorization theorem for hard exclusive electroproduction of mesons in QCD. The proof is valid for the leading power in Q and all logarithms. This generalizes previous work on vector meson production in the diffractive region of small x. The amplitude is expressed in terms of off-diagonal generalizations of the usual parton densities. The full theorem applies to all kinds of meson and not just to vector mesons. The parton densities used include not only the ordinary parton density, but also the helicity density (g_1 or $\Delta q$) and the transversity density ($h_1$ or $\delta q$), and these can be probed by measuring the polarization of the produced mesons with unpolarized protons.

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Cited by 13 Pith papers

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