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arXiv 2106.09080hep-lathep-phnucl-th
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全QCD格点模拟研究双夸克态性质

Diquark properties from full QCD lattice simulations

Anthony Francis, Philippe de Forcrand, Randy Lewis, Kim Maltman

摘要:

我们研究了在静态夸克背景下的格点上的双夸克,在一个规范不变的形式主义与夸克质量下降到几乎物理的$m_π$。我们确定双夸克通道之间的质量差以及双夸克夸克质量差。最轻和次轻的双夸克具有“好”标量$\bar{3}_F$、$\bar{3}_c$、$J^P=0^+$,和“坏”轴矢量$6_F$、$\bar{3}_c$、$J^P=1^+$,量子数,以及$ud$味的坏-好质量差$198(4)~\rm{MeV}$,与唯象测定非常一致。夸克-夸克吸引力只存在于“好”的双夸克通道中。我们提取相应的双夸克大小的$\sim 0.6~\rm{fm}$和执行的“好”的双夸克形状,这是球形的第一次探索。我们的研究结果提供了定量的支持,用于建模的低洼重子谱使用良好的轻双夸克有效自由度。

英文摘要:

We study diquarks on the lattice in the background of a static quark, in a gauge-invariant formalism with quark masses down to almost physical $m_π$. We determine mass differences between diquark channels as well as diquark-quark mass differences. The lightest and next-to-lightest diquarks have "good" scalar, $\bar{3}_F$, $\bar{3}_c$, $J^P=0^+$, and "bad" axial vector, $6_F$, $\bar{3}_c$, $J^P=1^+$, quantum numbers, and a bad-good mass difference for $ud$ flavors, $198(4)~\rm{MeV}$, in excellent agreement with phenomenological determinations. Quark-quark attraction is found only in the "good" diquark channel. We extract a corresponding diquark size of $\sim 0.6~\rm{fm}$ and perform a first exploration of the "good" diquark shape, which is shown to be spherical. Our results provide quantitative support for modeling the low-lying baryon spectrum using good light diquark effective degrees of freedom.

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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