Predictions for the $${\varvec{\Lambda }_b \rightarrow J/\psi ~ \Lambda (1405)}$$ Λ b → J / ψ Λ ( 1405 ) decay

Abstract

We calculate the shape of the and invariant mass distributions in the and decays that are dominated by the resonance. The weak interaction part is the same for both processes and the hadronization into the different meson–baryon channels in the final state is given by symmetry arguments. The most important feature is the implementation of the meson–baryon final-state interaction using two chiral unitary models from different theoretical groups. Both approaches give a good description of antikaon–nucleon scattering data, the complex energy shift in kaonic hydrogen and the line shapes of in photoproduction, based on the two-pole scenario for the . We find that this reaction reflects more the higher mass pole and we make predictions of the line shapes and relative strength of the meson–baryon distributions in the final state.

The hidden-charm pentaquark and tetraquark states

“…[414] discussed the Λ b → J/ψΛ(1405) decay. Similar production mechanisms of hidden charm pentaquarks with strangeness from Λ b and Ξ b decays were investigated in Refs.…”

J/ψNinteractions revisited andΛb0→Xiao1 2017Phys. Rev. D15090View full textAdd to dashboardCite

“…[78] shows that this tree-level contribution is nontrivial which is the same weight as the K − p amplitude as found in Ref. [41]. Since we do not consider the contributions from the K − p amplitude that was taken into account in Ref.…”

“…Following the method used in Refs. [14,41] (more details and discussions about this method can be found in Ref. [77], and references 6 Note that this does not hold for theKN interactions in the isospin I ¼ 1 sector, where important contributions of the u channel were found in Ref.…”

“…On the other hand, the role of Λð1405Þ in the Λ 0 b → J=ψK − p decays was discussed with both the Murcia-Valencia model and Bonn model in Ref. [41] before the experiments. Thus, about the existence of these two pentaquark states, the confidence and the suspicion coexist since there are different theoretical opinions about them.…”

The Role of High Spin Hyperon Resonances in the Ξ Production Meson-Baryon Reactions

“…One such opportunity arises from the weak decay of the Λ b into states containing a J/Ψ and meson-baryon pairs [18], measured by the CDF [19] and LHCb [20] collaborations, and recently our models have been applied to make predictions for such a decay with different final meson-baryon pairs [21,22].…”