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Helicity Formalism and Spin Asymmetries in Hadronic Processes

M. Anselmino, M. Boglione, U. D'Alesio, E. Leader, S. Melis, F. Murgia

hep-pharXiv:hep-ph/0512124

Abstract

We present a generalized QCD factorization scheme for the high energy inclusive polarized process, (A, SA) + (B, SB) -> C + X, including all intrinsic partonic motions. This introduces many non-trivial azimuthal phases and several new spin and kT dependent soft functions. The formal expressions for single and double spin asymmetries are discussed. Numerical results for AN[p(transv. polarized) p -> pi + X] are presented.

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