论文标题
解密最近发现的Tetraquark候选人约为6.9 GEV
Deciphering the recently discovered tetraquark candidates around 6.9 GeV
论文作者
论文摘要
最近在LHCB中观察到了一种新型的Hadronic质量6.9 GEV，主要腐烂到一对charmonia。该数据还揭示了一个更广泛的结构，中心约为6490 MEV，并建议另一个未经证实的共振，中心约为7240 MEV，非常接近两个双重诱人的$ξ_{cc} $ baryons的阈值。我们在此指出中认为，这些异国情调的亨德子是真正的四夸克，而不是charmonia的分子。可以猜想它们是v-baryonium tetraquarks，即具有带有$ cc $ diquark的巴里型顶点的内部结构，该结构与$ cc $ diquark相连，它通过字符串连接到带有$ \ bar c \ bar c \ bar c \ bar c \ bar c $ c $ anti anti anti-diquark。我们将这些状态视为$ψ（4360）$和$ y（4630）$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$/$ψ（4660）$的类似物。测试这些主张的一种方法是，在7.2 GEV中搜索该状态的重大衰减到$ξ_{cc} \overlineξ_{cc} $中。这样的衰减将是状态$ y（4630）$ to $λ_c\overlineλ_c$的类似物。我们进一步认为，$ x（6900）$的轨道和径向激发态应该存在轨迹。我们预测他们的群众。 LHCB可能已经看到了其中一些州。
Recently a novel hadronic state of mass 6.9 GeV, that decays mainly to a pair of charmonia, was observed in LHCb. The data also reveals a broader structure centered around 6490 MeV and suggests another unconfirmed resonance centered at around 7240 MeV, very near to the threshold of two doubly charmed $Ξ_{cc}$ baryons. We argue in this note that these exotic hadrons are genuine tetraquarks and not molecules of charmonia. It is conjectured that they are V-baryonium tetraquarks, namely, have an inner structure of a baryonic vertex with a $cc$ diquark attached to it, which is connected by a string to an anti-baryonic vertex with a $\bar c \bar c$ anti-diquark. We examine these states as the analogs of the states $Ψ(4360)$ and $Y(4630)$/$Ψ(4660)$ which are charmonium-like tetraquarks. One way to test these claims is by searching for a significant decay of the state at 7.2 GeV into $Ξ_{cc}\overlineΞ_{cc}$. Such a decay would be the analog of the decay of the state $Y(4630)$ into to $Λ_c\overlineΛ_c$. We further argue that there should be trajectories of both orbital and radial excited states of the $X(6900)$. We predict their masses. It is possible that a few of these states have already been seen by LHCb.
