奇异四夸克通道的晶格研究

R. Hudspith, B. Colquhoun, A. Francis, R. Lewis, K. Maltman
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引用次数: 30

摘要

我们对一些通道进行$n_f=2+1$晶格研究,在这些通道中,过去文献中存在强相互作用稳定的轻质四夸克的存在。除了在早期的晶格研究中发现的$J^P=1^+$、$I=0$$ud\bar{b}\bar{b}$和$I=1/2$$ls\bar{b}\bar{b}$态之外,我们没有发现任何这样的深束缚态存在的证据。我们还描述了对我们以前的晶格研究的一些系统改进,包括使用更大的$m_\pi L$来更好地抑制可能的有限体积效应,使用扩展汇来更好地控制激发态污染,以及扩大GEVP分析中使用的算子数量。我们的结果也允许我们排除一些现象模型,这些模型预测在没有发现这种结合的通道中有显著的四夸克结合。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Lattice investigation of exotic tetraquark channels
We perform an $n_f=2+1$ lattice study of a number of channels where past claims exist in the literature for the existence of strong-interaction-stable light-heavy tetraquarks. We find no evidence for any such deeply-bound states, beyond the $J^P=1^+$, $I=0$ $ud\bar{b}\bar{b}$ and $I=1/2$ $ls\bar{b}\bar{b}$ states already identified in earlier lattice studies. We also describe a number of systematic improvements to our previous lattice studies, including working with larger $m_\pi L$ to better suppress possible finite volume effects, employing extended sinks to better control excited-state contamination, and expanding the number of operators used in the GEVP analyses. Our results also allow us to rule out several phenomenological models which predict significant tetraquark binding in channels where no such binding is found.
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