Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-02-18
Phys.Part.Nucl.Lett.6:440-445,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages,8 figures
Scientific paper
10.1134/S154747710906003X
We discuss some experimental and theoretical results on single spin asymmetries (SSA) in high energy lepton-hadron and hadron-hadron reactions. In particular, recent results on meson SSA obtained by HERMES are considered in detail. We also discuss the SSA results obtained recently by COMPASS, as well as those from BRAHMS, PHENIX and STAR. Special attention is paid to a possible nonperturbative QCD mechanism that might be responsible for the observed meson SSA. This mechanism originates from the spin-flip quark-gluon chromomagnetic interaction induced by the complex topological structure of the QCD vacuum. We argue that in semi-inclusive deep-inelastic scattering a large SSA is expected not only for mesons but also for baryons due to strong nonperturbative final state interactions between $ud$-diquark and $u$-quark in the fragmenting proton.
Dorokhov Alexander E.
Kochelev Nikolai I.
Nowak Wolf-Dieter
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