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arXiv 1206.4339hep-phhep-exhep-latnucl-th
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连通海帕顿

Connected-Sea Partons

Keh-Fei Liu, Wen-Chen Chang, Hai-Yang Cheng, Jen-Chieh Peng

备注：
Revised version to be published in Phys. Rev. Lett
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摘要：

根据强子张量的路径积分形式，核子海包含两个不同的组成部分，称为连通海（CS）和非连通海（DS）。讨论了在格点量子色动力学计算部分子分布矩时，如何取用CS和DS。我们发现，CS和DS组件$\bar u(x) + \bar d(x)$可以提取通过使用最近的数据的奇异部分子分布，CT10的全球拟合，和晶格的奇怪的比例，$u(d)$时刻在断开插入的结果。提取的CS和DS的$\bar u(x) + \bar d(x)$有明显的Bjorken $x$依赖性与预期的定性一致。分析还表明，在$Q^2 = 2.5 {\rm GeV}^2$处，$\bar u(x) + \bar d(x)$的动量分数在CS和DS之间大致相等。未来的全球分析的部分子分布的影响。

英文摘要：

According to the path-integral formalism of the hadronic tensor, the nucleon sea contains two distinct components called connected sea (CS) and disconnected sea (DS). We discuss how the CS and DS are accessed in the lattice QCD calculation of the moments of the parton distributions. We show that the CS and DS components for $\bar u(x) + \bar d(x)$ can be extracted by using recent data on the strangeness parton distribution, the CT10 global fit, and the lattice result of the ratio of the strange to $u(d)$ moments in the disconnected insertion. The extracted CS and DS for $\bar u(x) + \bar d(x)$ have distinct Bjorken $x$ dependence in qualitative agreement with expectation. The analysis also shows that the momentum fraction of the $\bar u(x) + \bar d(x)$ is about equally divided between CS and DS at $Q^2 = 2.5 {\rm GeV}^2$. Implications on future global analysis for parton distributions are presented.

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