Abstract
We study the weak decay of the $\Lambda_b$ baryon into $J/\psi\ \phi\ \Lambda$, a process that is particularly well suited to analyze the physics of some of the recently observed or theoretically predicted exotic hadrons, as one expects to see their signature in all three final two-body channels. In the $J/\psi \, \phi$ invariant mass spectrum we study the interplay between the $X(4140)$ and the $X(4160)$ resonances. The $J/\psi \, \Lambda$ mass spectrum may help to identify the strange partner of the hidden-charm pentaquark recently observed by the LHCb collaboration, the existence of which has been predicted by a chiral unitary approach. We conclude that this strange pentaquark has a good chance of experimental detection if it is present in the range between $4450-4500$ MeV. Finally, in the $\phi \, \Lambda$ spectrum we expect a contribution from a dynamically generated resonance at around $2160$ MeV, but with the present model parameters there is little chance for its experimental detection.
Highlights
The purpose of this work is to study the Λb → J=ψφΛ decay and to demonstrate that this reaction is interesting as it allows for the possibility of detecting exotic hadrons in the three different two-body invariant mass spectra
Let us briefly review first the experimental and the theoretical works on exotic hadrons that are relevant to the present study
We summarize the theoretical works on exotic hadrons
Summary
The purpose of this work is to study the Λb → J=ψφΛ decay and to demonstrate that this reaction is interesting as it allows for the possibility of detecting exotic hadrons in the three different two-body invariant mass spectra. In the years from 2009 to 2014, a series of experimental observations of the Xð4140Þ were reported by collaborations such as CDF [3,4], LHCb [5], CMS [6] and D0 [7,8]. All these studies associated a narrow width to this resonance with the average being around 19 MeV, as reported
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