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 \(\Xi _{cc}\) 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 , 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 V-baryonium states \(\Psi (4360)\) and Y(4630)/\(\Psi (4660)\) 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 \(\Xi _{cc}{\overline{\Xi }}_{cc}\). Such a decay would be the analog of the decay of the state Y(4630) into to \(\Lambda _c{\overline{\Lambda }}_c\). 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.

最近，在LHCb中观察到了质量为6.9 GeV的新型强子态，该态主要衰变成一对苯甲醛。数据还揭示了以6490 MeV为中心的更广泛的结构，并提出了另一个以7240 MeV为中心的未确认的共振，非常接近两个倍增的\（\ Xi _ {cc} \）重子的阈值。我们在本说明中指出，这些奇异的强子是真正的四夸克，而不是角紫罗兰分子。据推测，它们是V型重氮 ，即具有重氮顶点的内部结构，并带有cc diquark，并通过字符串将其连接到具有\（{\ bar {c} } {\ bar {c}} \）反夸克。我们将这些状态视为V-钡的类似物 状态\（\ Psi（4360）\）和Y（4630）/ \（\ Psi（4660）\）都是像charm一样的四夸克。测试这些声明的一种方法是，在7.2 GeV处搜索状态显着衰减到\（\ Xi _ {cc} {\ overline {\ Xi}} _ {cc} \）中。这样的衰减将类似于状态Y（4630）衰减成\（\ Lambda _c {\ overline {\ Lambda}} _ c \）的模拟。我们进一步认为，应该同时存在X（6900）的轨道和径向激发态的轨迹。我们预测他们的人数。LHCb可能已经看到了其中一些状态。