Abstract
We investigate the B^+rightarrow J/psi phi K^+ decay via various rescattering diagrams. Without introducing genuine exotic resonances, it is shown that the Z_{cs}(4000), Z_{cs}(4220) and X(4700) reported by the LHCb collaboration can be simulated by the J/psi K^{*+}, psi ^prime K^+ and psi ^prime phi threshold cusps, respectively. These cusps are enhanced by some nearby triangle singularities. The X(4685) with J^P=1^+ cannot be well simulated by the threshold effects in our model, which implies that it may be a genuine resonance.
Highlights
Very recently, the LHCb collaboration reported the observation of several resonance-like structures in the B+ → J/ψφ K + decay [1]
Without introducing genuine exotic states, it is shown that the Zcs(4000) and Zcs(4220)
Reported by LHCb can be simulated by the J/ψ K ∗+ and ψ K + threshold cusps, respectively
Summary
The LHCb collaboration reported the observation of several resonance-like structures in the B+ → J/ψφ K + decay [1]. The resonance-like peaks observed in the J/ψφ invariant mass distributions are very intriguing, because they may contain both a ccpair and and an sspair, which implies that these states may be exotic. There have been many theoretical interpretations concerning the nature of these exotic hadron candidates, such as molecular states, tetraquark states, or hybrid. Apart from these genuine resonances interpretations, some nonresonance interpretations were proposed in literature. We study the B+ → J/ψφ K + decay by considering several possible rescattering processes, and try to provide a natural explanation for the exotic hadron candidates Zcs(4000), Zcs(4220), X (4700) and X (4685) reported by LHCb
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