Single Spin Asymmetries in High Energy Reactions and Nonperturbative QCD Effectsстатья
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Дата последнего поиска статьи во внешних источниках: 4 февраля 2014 г.
Аннотация: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.