Models for the Polarized Parton Distributions of the Nucleon

Details Models for the Polarized Parton Distributions of the Nucleon Models for the Polarized Parton Distributions of the Nucleon

2000-11-17

arxiv.org/abs/hep-ph/0011215v1

Phys.Rev. D63 (2001) 094005

Physics

High Energy Physics

High Energy Physics - Phenomenology

39 pages, LaTeX

Scientific paper

10.1103/PhysRevD.63.094005

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 (antiquark) distribution $\delta\bar{q}$, and a completely SU(3)$_f$ broken `valence' scenario with totally flavor-asymmetric light sea densities $(\delta\bar{u}\neq\delta\bar{d}\neq\delta\bar{s})$. The latter flavor-broken light sea distributions are modelled with the help of a Pauli-blocking ansatz at the low radiative/dynamical input scales of $\mu_{\rm LO(NLO)}^2=0.26$ (0.40) GeV$^2$ which complies with predictions of the chiral quark-soliton model and expectations based on the statistical parton model as well as with the corresponding, well established, flavor-broken unpolarized sea ($\bar{d}>\bar{u}$). 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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