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首页> 外文期刊>Physical review, D >Heavy-quark spin and flavor symmetry partners of the X(3872) revisited: What can we learn from the one boson exchange model?
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Heavy-quark spin and flavor symmetry partners of the X(3872) revisited: What can we learn from the one boson exchange model?

机译：再谈X（3872）的重夸克自旋和风味对称伙伴：我们可以从一个玻色子交换模型中学到什么？

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Heavy-quark symmetry as applied to heavy hadron systems implies that their interactions are independent of their heavy-quark spin (heavy-quark spin symmetry) and heavy flavor contents (heavy flavor symmetry). In the molecular hypothesis the X ( 3872 ) resonance is a 1 + + D * D ˉ bound state. If this is the case, the application of heavy-quark symmetry to a molecular X ( 3872 ) suggests the existence of a series of partner states, the most obvious of which is a possible 2 + + D * D ˉ * bound state for which the two-body potential is identical to that of the 1 + + D * D ˉ system, the reason being that these two heavy hadron-antihadron states have identical light-spin content. As already discussed in the literature, this leads to the prediction of a partner state at 4012?MeV, at least in the absence of other dynamical effects which might affect the location of this molecule. However the prediction of further heavy-quark symmetry partners cannot be made solely on the basis of symmetry and requires additional information. We propose to use the one-boson-exchange model to fill this gap, in which case we will be able to predict or discard the existence of other partner states. Besides the isoscalar 2 + + D * D ˉ * bound state, we correctly reproduce the location and quantum numbers of the isovector hidden-bottom Z b ( 10610 ) and Z b ( 10650 ) molecular candidates. We also predict the hidden-bottom 1 + + B * B ˉ * and 2 + + B * B ˉ * partners of the X ( 3872 ) , in agreement with previous theoretical speculations, plus a series of other states. The isoscalar, doubly charmed 1 + ? ? D D * and D * D * molecules, and their doubly bottomed counterparts are likely to bind, providing a few instances of explicitly exotic systems.
机译：适用于重质强子系统的重夸克对称性意味着它们的相互作用独立于重夸克自旋（重夸克自旋对称）和浓味含量（重香对称）。在分子假设中，X（3872）共振为1 + + D * Dˉ结合态。如果是这种情况，将重夸克对称应用于分子X（3872）则表明存在一系列伙伴状态，其中最明显的是可能的2 + + D * Dˉ*束缚态两体电势与1 + + D * Dˉ系统的电势相同，原因是这两个重的强子-反强子态具有相同的轻旋含量。正如文献中已经讨论过的那样，至少在没有其他可能影响该分子位置的动力学效应的情况下，这导致对伴侣状态在4012？MeV的预测。但是，不能完全根据对称性来预测其他重夸克对称伙伴，并且需要其他信息。我们建议使用一次玻色子交换模型来填补这一空白，在这种情况下，我们将能够预测或丢弃其他伙伴状态的存在。除了等量2 + + D * Dˉ*束缚态之外，我们还正确地再现了等位点隐藏底Z b（10610）和Z b（10650）分子候选物的位置和量子数。我们还根据先前的理论推测以及一系列其他状态，预测了X（3872）的隐藏底1 + + B * Bˉ*和2 + + B * Bˉ*的伙伴。等量倍增1 +？ ？ D D *和D * D *分子及其加倍底部的对应物很可能会结合，从而提供了一些明显异乎寻常的系统实例。

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