Abstract
In the framework of the color-magnetic interaction model, we have systematically calculated the mass splittings for the S-wave triply heavy pentaquark states with the configuration $qqQQ\bar{Q}$ $(Q=c,b;q=u,d,s)$. Their masses are estimated and their stabilities are discussed according to possible rearrangement decay patterns. Our results indicate that there may exist several stable or narrow such states. We hope the present study can help experimentalists to search for exotic pentaquarks.
Highlights
The possible existence of multiquark states beyond the ordinary hadrons was first proposed by Gell-Mann and Zweig [1,2]
We hope the present study can help experimentalists search for exotic pentaquarks
The LHCb Collaboration reported the observation of new pentaquark states at the Rencontres de Moriond QCD conference [27,28]
Summary
The possible existence of multiquark states beyond the ordinary hadrons was first proposed by Gell-Mann and Zweig [1,2]. Because of the complicated interactions between the internal quarks, it is generally hard to distinguish whether a hadron is a tightly bound tetraquark (pentaquark) state, a conventional meson (baryon), a molecular state, or a structure in other pictures. If a heavy quark-antiquark pair forms an unflavored state, such pentaquarks look like excited qqQ baryons. We use the color-magnetic interaction (CMI) model to perform a preliminary calculation the mass splittings and investigate the mass spectrum of the qqQQQpentaquark states. In earlier studies on the pentaquark properties, color-magnetic effects were intensively considered as the primary contribution in an attempt to explain the narrow hadronic resonances as well [95].
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