Measurement of parton distributions of strange quarks in the nucleon from charged-kaon production in deep-inelastic scattering on the deuteron
Measurement of parton distributions of strange quarks in the nucleon from charged-kaon production in deep-inelastic scattering on the deuteron
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DOI：
10.1016/j.physletb.2008.07.090
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发表时间：
2008-03
影响因子：
4.4
通讯作者：
H. C. A. Airapetian;E. al.
中科院分区：
文献类型：
--
作者：
H. C. A. Airapetian;E. al.
从氘核深度非弹性散射中的荷电K介子产生出发，得到了核子中奇夸克海的动量和螺旋度密度分布。从自旋平均的K±多重性，并从K±和包括双自旋不对称性极化正电子的散射极化氘靶的分布提取。动量分布的形状比u和d夸克的平均值更柔和。在测量值0.02<x <0.6 and Q2>1.0 GeV 2的区域内，在实验不确定性范围内，螺旋度分布为零。
The momentum and helicity density distributions of the strange quark sea in the nucleon are obtained in leading order from charged-kaon production in deep-inelastic scattering on the deuteron. The distributions are extracted from spin-averaged K±multiplicities, and from K±and inclusive double-spin asymmetries for scattering of polarized positrons by a polarized deuterium target. The shape of the momentum distribution is softer than that of the average of the u¯ and d¯ quarks. In the region of measurement 0.02<x<0.6 and Q2>1.0 GeV2, the helicity distribution is zero within experimental uncertainties.