Hidden-color configurations are a key prediction of QCD with important physical consequences. In this work we examine a QCD color-singlet configuration in nuclei formed by combining six scalar $[ud]$ diquarks in a strongly bound $\mathrm{SU}{(\mathrm{3})}_{\mathrm{C}}$ channel. The resulting hexadiquark state is a charge-2, spin-0, baryon number-4, isospin-0, color-singlet state. It contributes to alpha clustering in light nuclei and to the additional binding energy not saturated by ordinary nuclear forces in ${}^{\mathrm{4}}\mathrm{He}$ as well as the alpha-nuclei sequence of interest for nuclear astrophysics. We show that the strongly bound combination of six scalar isospin-0 $[ud]$ diquarks within the nuclear wave function - relative to free nucleons - provides a natural explanation of the EMC effect measured by the CLAS collaboration's comparison of nuclear parton distribution function ratios for a large range of nuclei. These experiments confirmed that the EMC effect; i.e., the distortion of quark distributions within nuclei, is dominantly identified with the dynamics of neutron-proton (“isophobic”) short-range correlations within the nuclear wave function rather than proton-proton or neutron-neutron correlations.

隐藏的颜色配置是对QCD具有重要物理后果的关键预测。在这项工作中，我们研究了通过结合六个标量形成的核中的QCD颜色-单分子构型$[üd]$ 严格绑定的夸克 $\mathrm{苏}{（\mathrm{3}）}_{\mathrm{C}}$渠道。最终的六夸克状态为电荷2，自旋0，重子数为4，同位旋0，色单状态。它有助于轻核中的α团簇和有助于普通核力不饱和的附加结合能。${}^{\mathrm{4}}\mathrm{他}$以及核天体物理学感兴趣的α核序列。我们表明六个标量isospin-0的强绑定组合$[üd]$相对于游离核子而言，核波函数中的双夸克自然解释了EMC效应，该效应是通过CLAS合作比较大范围核的Parton分布函数比率来衡量的。这些实验证实了EMC的效果；也就是说，核中夸克分布的畸变主要是由核波函数中的中子-质子（“等距”）短程相关性而不是质子-质子或中子-中子相关性来确定的。