Zusammenfassung
Polarized deep inelastic scattering (DIS) data are analyzed in leading and next-to-leading order of QCD within the common "standard" scenario of polarized parton distributions with a flavor-symmetric light sea (antiqualk) distribution delta(q) over bar, and a completely SU(3)(f) broken "valence" scenario with totally flavor-asymmetric light sea densities (delta(u) over bar not equal delta(d) over ...
Zusammenfassung
Polarized deep inelastic scattering (DIS) data are analyzed in leading and next-to-leading order of QCD within the common "standard" scenario of polarized parton distributions with a flavor-symmetric light sea (antiqualk) distribution delta(q) over bar, and a completely SU(3)(f) broken "valence" scenario with totally flavor-asymmetric light sea densities (delta(u) over bar not equal delta(d) over bar not equal delta(s) over bar). The latter flavor-broken light sea distributions are modeled with the help of a Pauli-blocking ansatz at the low radiative or dynamical input scales of mu (2)(LO(NLO)) = 0.26 (0.40) GeV2 which complies with predictions of the chiral quarh;-soliton model and expectations based on the statistical parton model as well as with the corresponding, well established, flavor-broken unpolarized sea ((d) over bar><(<mu>)over bar>). Present semi-inclusive DIS data cannot yet uniquely discriminate between those two flavor-symmetric and flavor-broken polarized light sea scenarios.
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