论文标题
S波的频谱完全重型的Tetraquark表明
Spectrum of the S-wave fully-heavy tetraquark states
论文作者
论文摘要
在目前的工作中，$ s $ - 波的频谱完全沉重的tetraquark说明$ qq \ bar {q} \ bar {q} $（$ q = c，b $），即$ cc \ bar {b} \ bar {b} $/ $ bb \ bar {c} \ bar {c} $，$ bc \ bar {c} \ bar {c} $/ $ cc \ bar {b} $bb\bar{c}\bar{b}$/$cb\bar{b}\bar{b}$, and $bc\bar{b}\bar{c}$ are systematically investigated within an nonrelativistic constituent quark model, in which the Instanton-induced and one-gluon-exchange interactions are taken into account as the residual spin-dependent超细相互作用。我们的结果表明，具有$ cc \ bar {c} \ bar {c} $和$ bb \ bar {b} \ bar {b} $组件的状态分别分别位于$ 6500 $ MEV和$ 19200 $ MEV。根据我们的计算，LHCB观察到的新的$ x（6900）$状态可能不是$ cc \ bar {c} \ bar {c} $ tetraquark state，而它可能是$ cc \ bar {c} c} \ bar {c} $ system的典型或辐射激发的状态。另一方面，CMS和ATLAS最近报道的$ x（6600）$状态可以解释为$ cc \ bar {c} \ bar {c} $ tetraquark State，带有spin-pary $ j^{pc} = 0^{++} $。
In present work, spectrum of the $S$-wave fully-heavy tetraquark states $QQ\bar{Q}\bar{Q}$ ($Q=c,b$), i.e., $cc\bar{c}\bar{c}$, $bb\bar{b}\bar{b}$, $cc\bar{b}\bar{b}$/$bb\bar{c}\bar{c}$, $bc\bar{c}\bar{c}$/ $cc\bar{b}\bar{c}$, $bb\bar{c}\bar{b}$/$cb\bar{b}\bar{b}$, and $bc\bar{b}\bar{c}$ are systematically investigated within an nonrelativistic constituent quark model, in which the Instanton-induced and one-gluon-exchange interactions are taken into account as the residual spin-dependent hyperfine interaction. Our results show that the states with $cc\bar{c}\bar{c}$ and $bb\bar{b}\bar{b}$ components could be located around $ 6500$ MeV and $ 19200$ MeV, respectively. Based on our calculations, the new $X(6900)$ state observed by LHCb may be not a ground $cc\bar{c}\bar{c}$ tetraquark state, while it could be an orbitally or radially excited state of $cc\bar{c}\bar{c}$ system. On the other hand, the recently reported $X(6600)$ state by CMS and ATLAS can be explained as a ground $cc\bar{c}\bar{c}$ tetraquark state with spin-parity $J^{PC} =0^{++}$.
