论文标题
四夸克异国情调的介子
Four-quark exotic mesons
论文作者
论文摘要
我们审查了用于分析共振$ z_ {c}（3900）$的调查$ Y（2175）$在Belle，Babar，Besiii，D0，CDF，CMS，LHCB和Compass Consergonation中发现的各种过程中。这些共振被认为是对四夸克（Tetraquark）异国情调的介子的严重候选者。我们将所有这些都视为具有相关自旋差异的diquark-antidiquark状态，找到它们的质量和耦合，并探索其主要的强衰变通道。计算是在QCD总规则方法的上下文中执行的。因此，使用两点和规则评估四夸克的光谱参数。对于强耦合的计算，$ g_ {tm_1m_2} $，对应于顶点$ tm_1m_2 $，以找到强衰减的部分宽度$ t \ to m_1m_2 $，我们使用QCD轻度灯单式总和规则的三点或完整/近似版本。将获得的结果与可用的实验数据以及其他理论研究的预测进行了比较。
We review our investigations devoted to the analysis of the resonances $ Z_{c}(3900)$, $Z_{c}(4430)$, $Z_{c}(4100)$, $X(4140)$, $X(4274)$, $a_1(1420)$ , $Y(4660)$, $X(2100)$, $X(2239)$ and $Y(2175)$ discovered in various processes by Belle, BaBar, BESIII, D0, CDF, CMS, LHCb and COMPASS collaborations. These resonances are considered as serious candidates to four-quark (tetraquark) exotic mesons. We treat all of them as diquark-antidiquark states with relevant spin-parities, find their masses and couplings, as well as explore their dominant strong decay channels. Calculations are performed in the context of the QCD sum rule method. Thus, the spectroscopic parameters of the tetraquarks are evaluated using the two-point sum rules. For computations of the strong couplings $G_{TM_1M_2}$, corresponding to the vertices $TM_1M_2$ and necessary to find the partial widths of the strong decays $T \to M_1M_2$, we employ either the three-point or full/approximate versions of the QCD light-cone sum rules methods. Obtained results are compared with available experimental data, and with predictions of other theoretical studies.
