We propose novel triangle relations, not the well-known triangle singularity, for better understanding of the exotic XY Z states. Nine XY Z resonances, X(3872), Y (4230), Zc(3900), X(4012), Y (4360/4390), Zc(4020), X(4274), Y (4660), and Zcs(3985) have been classified into triples to construct three triangles based on the assumption that they are all tetra-quark states. Here X(4012) has not been observed experimentally yet, and we predict its mass and roughly the width. We also suggest some channels deserving search for with high priority based on this hypothesis, as well as predictions of a few production/decay rates of these channels. We hope further experimental studies of the XY Z states will benefit from our results.

中文翻译：

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XY Z 状态的三角形关系

我们提出了新颖的三角形关系，而不是众所周知的三角形奇点，以便更好地理解奇异的X是 Z状态。九X是 Z共振，X(3872),是 (4230),ZC(3900),X(4012),是 (4360/4390),ZC(4020),X(4274),是 (4660)， 和ZCs(3985)基于它们都是四夸克状态的假设，已将它们分类为三元组以构造三个三角形。这里X(4012)尚未通过实验观察到，我们预测其质量和大致宽度。我们还根据这一假设建议了一些值得优先搜索的渠道，以及对这些渠道的一些生产/衰减率的预测。希望进一步的实验研究X是 Z各国将从我们的成果中受益。