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arXiv 1206.0808hep-phhep-ex
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光锥手征夸克模型中的质子自旋

Proton spin in a light-cone chiral quark model

Xinyu Zhang, Bo-Qiang Ma

摘要:

本文讨论了手征夸克模型光锥处理下质子的自旋结构。基于夸克螺旋度在极化深度非弹性散射实验中测量的夸克自旋($Δq$)实际上是光锥形式主义中定义的夸克自旋,而不是夸克自旋($Δq_{QM}$)定义在传统的夸克模型(或在核子的静止坐标系中),计算了极化夸克分布函数$Δq(x)$的$x$依赖性,并且极化结构起$g_1 (x)$的作用。特别关注的是由于夸克在核子内的横向运动的Melosh-Wigner旋转及其对裸夸克输入的影响。结果表明,我们的计算结果与实验数据吻合良好。

英文摘要:

We discuss the spin structure of the proton in a light-cone treatment of the chiral quark model. Based on the fact that the quark helicity ($Δq$) measured in polarized deep inelastic scattering experiments is actually the quark spin defined in the light-cone formalism, rather than the quark spin ($Δq_{QM}$) defined in the conventionally quark model (or in the rest frame of the nucleon), we calculate the $x$-dependence of the polarized quark distribution functions $Δq(x)$, and the polarized structure functions $g_1 (x)$. Special attention is focused on the Melosh-Wigner rotation due to the transversal motions of quarks inside the nucleon and its effects on the bare quark input. It is shown that our results match the experimental data well.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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