A New Mechanism for Single Spin Asymmetries in Strong Interactions

Details A New Mechanism for Single Spin Asymmetries in Strong Interactions A New Mechanism for Single Spin Asymmetries in Strong Interactions

1999-05-26

arxiv.org/abs/hep-ph/9905497v5

JETP Lett.72:481-485,2000; Pisma Zh.Eksp.Teor.Fiz.72:691-697,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 3 figures, Latex; final version to appear in JETP Lett

Scientific paper

10.1134/1.1343147

It is shown that the contribution of the instantons to the fragmentation of quarks leads to the appearance of a imaginary part in diagrams of quark-quark scattering at large transfer momentum. The imaginary part comes from the analytical continuation of the instanton amplitudes from Euclidean to Minkowsky space-time and reflects quasiclassical origin of instanton solution of QCD equations of motion. This phenomenon and instanton--induced quark spin-flip give a new nonperturbative mechanism for the observed anomalous single-spin asymmetries in hadron-hadron and lepton-hadron interactions.

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