论文标题
QCD和规则中的1+ XTZ状态
1+ XTZ States within QCD Sum Rules
论文作者
论文摘要
我们提出了对$ x_q，z_q $和$ t_ {qq \ bar q \ bar q'} $ state $ x_q，z_q $和$ t_q $ and z_q $和质量比的估计值的改进，使用（逆）qcd laplace sum（lsr），其比率$ {\ cal r} $ and double比（drs drsr）。我们得出的结论是，观察到的$ x_c（3872）$和$ z_c（3900）$是四元状态（准分子分子的叠加和与电流相似的耦合的叠加）与预测的质量相似） $ m _ {{{\ cal t} _ {z_c}} = 3900（42）$ MEV。我们还对不同$ t_ {qq \ bar q \ bar q'}的四夸克性质进行了广泛的分析。然后，结合$ {\ cal r} $和drsr，我们重新分析了观察到的状态$ x_c（3872）$，我们获得了$ m_ {t_ {cc}^{1^+}} $ = 3886（6）MEV的精确预测。扩展到美容领域，我们找到结果：$ m _ {{\ cal t} _ {z_b}} = 10579（99）$ MEV和$ m_ {x_b} = 10545（131）$ MEV。最后，我们与其他方法（晶格和夸克型号）的结合LSR $ \ oplus $ drsr结果面对。
We present improved estimates of the couplings, masses and mass ratios of the $X_Q, Z_Q$ and $T_{QQ\bar q\bar q'}$ states using (inverse) QCD Laplace sum rules (LSR), their ratios ${\cal R}$ and double ratios (DRSR), within stability criteria. We conclude that the observed $X_c(3872)$ and $Z_c(3900)$ are tetramoles states (superposition of quasi-degenerated molecule and tetraquark states having similar couplings to the currents) with the predicted masses: $M_{{\cal T}_{X_c}}=3876(44)$ MeV and $M_{{\cal T}_{Z_c}}=3900(42)$ MeV. We also do an extensive analysis of the four-quark nature of different $T_{QQ\bar q\bar q'}$ axial-vector states. Then, combining ${\cal R}$ and DRSR, we reanalyze the observed state $X_c(3872)$ and we obtain a precise prediction of $M_{T_{cc}^{1^+}}$=3886(6) MeV. Extending to the beauty sector, we find the results: $M_{{\cal T}_{Z_b}}=10579(99)$ MeV and $M_{X_b}=10545(131)$ MeV. Finally, we confront our combined LSR $\oplus$ DRSR results with the ones from some other approaches (lattices and quark models).
