Single Spin Asymmetry in Inclusive Pion Production

Details Single Spin Asymmetry in Inclusive Pion Production Single Spin Asymmetry in Inclusive Pion Production

1994-10-26

arxiv.org/abs/hep-ph/9410382v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

(To appear in the proceedings of the XI International Symposium on High Energy Spin Physics, September 15-22, Bloomington, Ind

Scientific paper

10.1063/1.48876

It is shown how the single spin asymmetry observed in inclusive pion production is related, in the helicity basis, to the imaginary part of the product of two different distribution amplitudes, rather than to the usual quark and gluon distribution functions; there is then no reason why it should be zero even in massless perturbative QCD, provided the quark intrinsic motion is taken into account. A simple model is constructed which reproduces the main features of the data.

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