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arXiv 2004.14659hep-phnucl-exnucl-th
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核中央核中的QCD隐色六夸克态

QCD Hidden-Color Hexa-diquark in the Central Core of Nuclei

Jennifer Rittenhouse West, Stanley J. Brodsky, Guy F. de Teramond, Alfred S. Goldhaber, Ivan Schmidt

摘要:

隐色组态是量子色动力学的一个重要预言,具有重要的物理意义。本文研究了在强束缚$\rm SU(3)_C$通道中由六个标量$[u d]$双夸克组合而成的核中的QCD色单态组态。由此产生的六夸克态是电荷2,自旋0,重子数4,同位旋0,色单态。它有助于轻核中的α成簇和\he中普通核力不饱和的额外结合能,以及核天体物理学感兴趣的α核序列。我们发现,强约束组合的6个标量的同位旋-0 $[ud]$双夸克的核波函数内-相对于自由核子-提供了一个自然的解释EMC效应的测量的CLAS合作的比较核部分子分布函数比率为大范围的核。这些实验证实了EMC效应,即,核内夸克分布的畸变主要与核波函数内的中子-质子("等阻“)短程关联的动力学而不是质子-质子或中子-中子关联相一致。

英文摘要:

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 $[u d]$ diquarks in a strongly bound $\rm SU(3)_C$ 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 \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.

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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