Abstract
We investigated the lightest pentaquark state observed by the LHCb collaboration as a compact five-quark ground-state, with spin S = 3/2, and we showed that this state belongs to a SUf(3) flavor octet by means of a group theory approach. Moreover, we predicted in a parameter-free way the pentaquark state mass spectra for all the octet-pentaquark states. Finally, by means of an effective Lagrangian approach, we computed the octet-pentaquark partial decay widths in J/ψΛ, J/ψΣ and J/ψΞ channels.
Highlights
In 2015, the Large Hadron Collider beauty experiment (LHCb) collaboration observed two hidden-charm pentaquarks, P+c (4380) and P+c (4450) in Λb → J/ΨK− p decay [1]
We investigated the lightest pentaquark state observed by the LHCb collaboration as a compact five-quark ground- state, with spin S = 3/2, and we showed that this state belongs to a S U f (3) flavor octet by means of a group theory approach
We studied all the charmonium pentaquark states which belong to the octet, predicted their masses, and suggested possible decay channels in which the experimentalists can observe them
Summary
In 2015, the Large Hadron Collider beauty experiment (LHCb) collaboration observed two hidden-charm pentaquarks, P+c (4380) and P+c (4450) in Λb → J/ΨK− p decay [1]. This decay can proceed both by intermediate Λ∗ → K− p resonances, expected to be dominant, and by intermediate exotic structures, which were referred to as charmonium pentaquark states by LHCb [1]. J/Ψ photoproduction data, they found an upper limit for branching ratio B(P+c → J/Ψp) By using this upper limit and our predicted masses, we calculated the partial decay widths for the predicted pentaquark resonances [4]
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