论文标题
$ x（2900）$的运动尖和共振解释
Kinematical Cusp and Resonance Interpretations of the $X(2900)$
论文作者
论文摘要
我们检查LHCB vector $ ud \ bar {c} \ bar {s} $ state $ x（2900）$可以解释为$ \ bar d^*k^*$和$ \ bar d_1 k^*$互动产生的$ \ bar d^*k^*$产生的振尖效应。生产振幅被建模为具有Hadronic最终状态相互作用的三角图。获得了达利兹图投影的令人满意的拟合度，即在不需要$ \ bar {d} k $共振的情况下利用生产图的奇异性。如果最终的状态相互作用足够强以产生共振，尽管有利于这种情况的证据并不是结论性的，但可以获得更好的拟合度。
We examine whether the LHCb vector $ud\bar{c}\bar{s}$ state $X(2900)$ can be interpreted as a kinematical cusp effect arising from $\bar D^*K^*$ and $\bar D_1 K^*$ interactions. The production amplitude is modelled as a triangle diagram with hadronic final state interactions. A satisfactory fit to the Dalitz plot projection is obtained that leverages the singularities of the production diagram without the need for $\bar{D}K$ resonances. A somewhat better fit is obtained if the final state interactions are strong enough to generate resonances, although the evidence in favour of this scenario is not conclusive.
