Models for the polarized parton distributions of the nucleon
Models for the polarized parton distributions of the nucleon
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DOI：
10.1103/physrevd.63.094005
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发表时间：
2000-11
影响因子：
5
通讯作者：
M. Glück;E. Reya;M. Stratmann;W. Vogelsang
中科院分区：
文献类型：
--
作者：
M. Glück;E. Reya;M. Stratmann;W. Vogelsang
在具有风味对称光海（反夸克）分布的极化部分子分布的常见“标准”情景$\ensuremath{\delta}\overline{q},$和具有完全风味不对称光海密度的完全${\mathrm{SU}(3)}_{f}$破碎的“价态”情景$(\ensuremath{\delta}\ifmmode \bar{u}\else ū\fi{}\ensuremath{\ne}\ensuremath{\delta}\overline{d}\ensuremath{\ne}\ensuremath{\delta}\overline{s}).$中，对偏振深度非弹性散射（DIS）数据进行了前序和次序的QCD分析。后一种风味破碎的光海分布在低能级上利用pauli阻塞分析进行了建模的辐射或动态输入尺度${\ensuremath{\mu}}_{\mathrm{LO}(\mathrm{NLO})}^{2}=0.26 (0.40){\mathrm{GeV}}^{2}$，符合手性夸克-孤子模型的预测和基于统计部分子模型的期望，以及相应的、完善的、风味破碎的非极化海$(\overline{d}g\ifmmode \bar{u}\else ū\fi{}).$目前的半包容性DIS数据还不能唯一地区分两种风味对称和风味破碎的偏振光海情景。
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 $\ensuremath{\delta}\overline{q},$ and a completely ${\mathrm{SU}(3)}_{f}$ broken ``valence'' scenario with totally flavor-asymmetric light sea densities $(\ensuremath{\delta}\ifmmode \bar{u}\else \={u}\fi{}\ensuremath{\ne}\ensuremath{\delta}\overline{d}\ensuremath{\ne}\ensuremath{\delta}\overline{s}).$ 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 ${\ensuremath{\mu}}_{\mathrm{LO}(\mathrm{NLO})}^{2}=0.26 (0.40){\mathrm{GeV}}^{2}$ 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 $(\overline{d}g\ifmmode \bar{u}\else \={u}\fi{}).$ Present semi-inclusive DIS data cannot yet uniquely discriminate between those two flavor-symmetric and flavor-broken polarized light sea scenarios.