Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-09-21
Phys.Rev.D71:014037,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
version 2 includes few refs and new fig.5 which contains comparison to recent data
Scientific paper
10.1103/PhysRevD.71.014037
It is by now well understood that spin asymmetry in deep inelastic scattering (DIS) can appear if two things are both present: (i) a chirality flip of the struck quark; (ii) a nonzero T-odd phase due to its final state interaction. So far (i) was attributed to a new structure/wave function of the nucleon and (ii) to some gluon exchanges. We propose a new mechanism utilizing strong vacuum fluctuations of the gluon field described semiclasically by instantons, and show that both (i) and (ii) are present. The magnitude of the effect is estimated using known parameters of the instanton ensemble in the QCD vacuum and known structure and fragmentation functions, without any new free parameters. The result agrees in sign and (roughly) in magnitude with the available data on single particle inclusive DIS. Furthermore, our predictions uniquely relate effects for longitudinally and transversely polarized targets.
Ostrovsky Dmitry
Shuryak Edward
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