Factorisation in higher-twist single-spin amplitudes
1 Dipartimento di Scienze,
Università dell'Insubria - sede di Como,
via Lucini 3, I-22100 Como, Italy
2 Istituto Nazionale di Fisica Nucleare - sezione di Milano, Italy
Received: 31 July 1998 / Revised version: 12 November 1998 / Published online: 11 March 1999
We analyse the twist-three amplitudes that can give rise to single-spin asymmetries in hadron-hadron scattering; in so doing we bring to light a novel factorisation property. As already known, the requirement of an imaginary part leads to consideration of twist-three contributions that are also related to transverse spin in deep-inelastic scattering. In particular, when an external line becomes soft in contributions arising from three-parton correlators, the imaginary part of an internal propagator may be exposed. As shown here, it is precisely this kinematical configuration that permits the factorisation. An important feature is the resulting simplification: the calculation of tens of Feynman diagrams normally contributing to such processes is reduced to the evaluation of products of the simple factors derived here and known two-body helicity amplitudes. We thus find clarifying relations between the spin-dependent and spin-averaged cross-sections and formulate a series of selection rules. In addition, the kinematical dependence of such asymmetries, is rendered more transparent.
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