论文标题
$ \ bar d $ - $ \ bar u $不对称质子的海Quark循环贡献
Sea-quark loop contributions to the $\bar d$-$\bar u$ asymmetry in the proton
论文作者
论文摘要
QCD相等质量费米香味的相互作用是风味盲。这一事实通常用于说明$ u $和$ d $ quarks在大众对称案例中断开的海Quark环路贡献相同，因此这些断开的海Quark Loop贡献不能为Proton中众所周知的$ \ bar d-bar d-bar d-bar u $不对称。取而代之的是，有人认为必须查看晶格QCD相关函数的连接扇区以找到这种差异。在本演讲中，我们注意到这些陈述是真实的，只要包括海Quark Loop部门的非物理贡献，Baryons的贡献都不出现在物理谱中。为了尊重保利原则，来自断开的海Quark Loop部门的这些非物理贡献必须取消相互联系的部门同样非物理的贡献。其余的断开海Quark循环贡献不再具有$ \ bar d $和$ \ bar U $之间的余额。在考虑循环贡献中只有物理观察到的重子，我们说明了海Quark Loop行业对$ \ bar d -bar u $的重要贡献，从而提高了领先的连接贡献12 \％。
QCD interactions for equal-mass fermion flavors are flavor blind. This fact is often used to state that disconnected sea-quark loop contributions are equal for $u$ and $d$ quarks in the mass symmetric case and therefore these disconnected sea-quark loop contributions cannot contribute to the well-known $\bar d - \bar u$ asymmetry in the proton. Instead, it is argued that one must look to the connected sector of lattice QCD correlation functions to find this difference. In this presentation, we note that these statements are true provided unphysical contributions in the sea-quark loop sector are included, contributions from baryons that do not appear in the physical spectrum. To respect the Pauli principle, these unphysical contributions from the disconnected sea-quark loop sector must cancel equally unphysical contributions in the connected sector. The remaining disconnected sea-quark loop contributions no longer have a balance between $\bar d$ and $\bar u$. Upon considering only physically observed baryons in the loop contributions, we illustrate an important contribution from the sea-quark loop sector to $\bar d - \bar u$ that enhances the leading connected contribution by 12\%.
