Preasymptotic effects in extraction of strange quark polarization

Europe/Rome
Aula Seminari (Laboratori Nazionali di Frascati, Via Enrico Fermi 40, Frascati)

Aula Seminari

Laboratori Nazionali di Frascati, Via Enrico Fermi 40, Frascati

Via Enrico Fermi 40 00044 Frascati
Description
ABSTRACT

Ordinary expression for SIDIS cross section based on QCD factorization theorem contains only partons Distribution and Fragmentation functions. This approximation is valid for very high energies. I'll discuss the parton model expression for (un)polarized SIDIS cross section based on LUND String Fragmentation Model. In this model Hadronization function appears to be spin dependent even for unpolarized hadron production off longitudinally polarized target. This effect can be modeled using LEPTO event generator. The presence of preasymptotic terms in cross section affect the final result on polarized strangeness. Required improvements in modern techniques of flavor decomposition will be discussed and the example based on HERMES data will be presented.



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