Speaker
Description
We study the weak decay of the $\Lambda_b$ baryon into $J/\psi\ \phi\ \Lambda$ and the possibility of formation of exotic hadrons via final state interaction in 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. Particularly for the $X(4160)$ resonance we use a theoretical model which dynamically generates it in chiral unitarity approach [Molina, Oset, PRD80, 114013 (2009)].
The $J/\psi \, \Lambda$ mass spectrum may help to identify the strange ($S=-1$) 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.
In the $\phi \, \Lambda$ spectrum there is a contribution from a dynamically generated resonance at around $2160$ MeV [Oset, Ramos, EPJA44, 445 (2010)], but with the present model parameters we see a rather little chance for its experimental detection.
