论文标题
四夸克国家及其在LHC观察中的证据
Fully-heavy tetraquark states and their evidences in the LHC observations
论文作者
论文摘要
Stimulated by the exciting progress on the observations of the fully-charmed tetraquarks at LHC, we carry out a combined analysis of the mass spectra and fall-apart decays of the $1S$-, $2S$-, and $1P$-wave $cc\bar{c}\bar{c}$ states in a nonrelativistic quark model (NRQM).发现在di-$ j/ψ$不变的质谱中观察到的$ x（6600）$结构可以通过$ 1S $ - 波状态$ t _ {（4c）0^{++}}}（6550）$来解释。这种结构还可能从$ 2S $和/或$ 1p $ tetraquark州产生一些较低的效果。 $ x（6900）$结构在di-$ j/ψ$和$ j/ψψ（2s）$ channels中观察到的结构自然可以由$ 2S $ - 波状态$ t _ {（4C）0^{++}}}（6957）$。在CMS和ATLAS上观察到的$ 6.2-6.4 $ GEV的小肩结构可能是由于$ C = -1 $和/或一些$ 2S $ -WAVE状态的$ 1P $ - 波状态的饲料降低造成的，具有$ J^{pc} = 0^{++} $。在这种情况下暗示了其他衰减通道，可以通过未来的实验分析对其进行研究。考虑到LHC的巨大发现潜力，我们还提出了$ bb \ bar {b} \ bar {b} $状态的预测，将来可以搜索。
Stimulated by the exciting progress on the observations of the fully-charmed tetraquarks at LHC, we carry out a combined analysis of the mass spectra and fall-apart decays of the $1S$-, $2S$-, and $1P$-wave $cc\bar{c}\bar{c}$ states in a nonrelativistic quark model (NRQM). It is found that the $X(6600)$ structure observed in the di-$J/ψ$ invariant mass spectrum can be explained by the $1S$-wave state $T_{(4c)0^{++}}(6550)$. This structure may also bear some feed-down effects from the higher $2S$ and/or $1P$ tetraquark states. The $X(6900)$ structure observed in both the di-$J/ψ$ and $J/ψψ(2S)$ channels can be naturally explained by the $2S$-wave state $T_{(4c)0^{++}}(6957)$. The small shoulder structure around $6.2-6.4$ GeV observed at CMS and ATLAS may be due to the feed-down effects from some $1P$-wave states with $C=-1$ and/or some $2S$-wave states with $J^{PC}=0^{++}$. Other decay channels are implied in such a scenario and they can be investigated by future experimental analyses. Considering the large discovery potential at LHC, we also present predictions for the $bb\bar{b}\bar{b}$ states which can be searched for in the future.
