Further signatures to support the tetraquark mixing framework for the two light-meson nonets
Further signatures to support the tetraquark mixing framework for the two light-meson nonets
复制标题
DOI：
10.1103/physrevd.99.014005
复制
发表时间：
2018-11
影响因子：
5
通讯作者：
Hungchong Kim;K. S. Kim;M. Cheoun;D. Jido;M. Oka
中科院分区：
文献类型：
--
作者：
Hungchong Kim;K. S. Kim;M. Cheoun;D. Jido;M. Oka
在这项工作中，我们研究了额外的签名，以支持四夸克混合框架，最近已提出作为一个可能的结构的两个九，即a0（980），K 0 *（800），f0（500），和f0（980）在轻九和a0（1450），K 0 *（1430），f0（1370），和f0（1500）在重九。首先，我们主张两个九弦波形成近似满足Gell-Mann-Okubo质量关系的味九弦波。然后我们重新研究了四夸克态九重态产生的质量序，并证明了这种质量序是由两个九重态满足的，尽管重九重态的质量序是边缘的。然而，边缘质量排序可以被认为是四夸克的另一个特征，因为它可以部分地由四夸克混合框架计算的超精细质量来解释。四夸克混合参数被发现是独立的同位旋给额外的支持形成的味道九。此外，我们还讨论了其他的方法，如双夸克图像和介子-介子束缚态，以及它们在解释这两个九子时可能存在的局限性。作为一个独特的签名区别于其他方法，我们调查的fallapart耦合强度到两个矢量介子从我们的四夸克。耦合强度到两个矢量模式被发现，以加强强烈的重九重态，而他们被抑制在轻九重态。耦合比，这取决于同位旋通道，被发现是巨大的约1500。这一趋势与双赝标衰变模相反，可以为四夸克态混合框架提供另一个试验场。一些实验证据有关的现象进行了讨论，特别是从属于重九重共振。
In this work, we investigate additional signatures to support the tetraquark mixing framework that has been recently proposed as a possible structure for the two nonets, namely a0(980), K0*(800), f0(500), and f0(980) in the light nonet and a0(1450), K0*(1430), f0(1370), and f0(1500) in the heavy nonet. First, we advocate that the two nonets form the flavor nonet approximately satisfying the Gell-Mann–Okubo mass relation. Then we reexamine the mass ordering generated from the tetraquark nonets and show that this mass ordering is satisfied by the two nonets although the ordering in the heavy nonet is marginal. The marginal mass ordering however can be regarded as another signature for tetraquarks because it can be explained partially by the hyperfine masses calculated from the tetraquark mixing framework. The tetraquark mixing parameters are found to be independent of isospins giving additional support for the formation of the flavor nonets. In addition, we discuss the other approaches like two-quark pictures or meson-meson bound states, and their possible limitations in explaining the two nonets. As a peculiar signature distinguished from other approaches, we investigate the fall-apart coupling strengths into two vector mesons from our tetraquarks. Coupling strengths into the two-vector modes are found to enhance strongly in the heavy nonet while they are suppressed in the light nonet. The coupling ratios, which depend on the isospin channel, are found to be huge around ∼15. This trend in the two-vector modes, which is opposite to that in the two-pseudoscalar fall-apart modes, can provide another testing ground for the tetraquark mixing framework. Some experimental evidence related to the phenomena is discussed particularly from the resonances belonging to the heavy nonet.