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arXiv 1503.07996hep-phhep-exhep-lat
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基于最近实验约束的$\mathcal{S} \mathcal{T} \langle N| \overline{q} D_μ D_ν q |N \rangle$的新测定

New determination of $\mathcal{S} \mathcal{T} \langle N| \overline{q} D_μ D_ν q |N \rangle$ based on recent experimental constraints

Philipp Gubler, Kie Sang Jeong, Su Houng Lee

摘要:

矩阵元$\mathcal{S} \mathcal{T} \langle N| \overline{q} D_μ D_ν q |N \rangle$的对称和无迹部分可以由扭转3部分子分布函数$e(x)$的二阶矩确定。最近,新的实验数据$e(x)$已成为可用的,这使我们能够评估上述矩阵元素的大小,大大降低了系统的不确定性。基于新的实验数据,我们表明,$\mathcal{S} \mathcal{T} \langle N| \overline{q} D_μ D_ν q |N \rangle$很可能是至少一个数量级小于以前的模型为基础的估计到目前为止建议。我们讨论的后果,这一观察分析的深度非弹性散射和QCD求和规则的研究在有限密度的矢量介子和核子,在此矩阵元素被用作输入参数。

英文摘要:

The symmetric and traceless part of the matrix element $\mathcal{S} \mathcal{T} \langle N| \overline{q} D_μ D_ν q |N \rangle$ can be determined from the second moment of the twist-3 parton distribution function $e(x)$. Recently, novel experimental data on $e(x)$ have become available, which enables us to evaluate the magnitude of the above matrix element with considerably reduced systematic uncertainties. Based on the new experimental data, we show that $\mathcal{S} \mathcal{T} \langle N| \overline{q} D_μ D_ν q |N \rangle$ is likely to be at least an order of magnitude smaller than what previous model-based estimates have so far suggested. We discuss the consequences of this observation for the analysis of deep inelastic scattering and QCD sum rules studies at finite density for the vector meson and the nucleon, in which this matrix element is being used as an input parameter.

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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