Exotic baryons as a hadronic molecule in the heavy quark region
Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Genova, via Dodecaneso 33, 16146 Genova, Italy
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Published online: 25 November 2016
We study the hadronic molecules formed by the coupled-channel system of D̄(*)Λc and D̄(*)Σc(*), inspired by the two hidden-charm pentaquark states observed by LHCb collaborations in 2015. In these molecules, the coupled channels of D̄(*)Σc(*) are important because the thresholds of these channels are approximately degenerated by the heavy quark spin symmetry. In addition, we consider the coupling to the D̄(*)Λc channel whose thresholds are close to the D̄(*)Σc(*) thresholds, and the coupling to the state with ℓ ≠ 0 mixed by the tensor force. By solving the coupled-channel Schrödinger equations with the one meson exchange potentials, we study the hidden-charm hadronic molecules with I(JP) = 1/2(3/2±) and 1/2(5/2±). We conclude that the JP assignment of the observed pentaquarks is 3/2+ for P+c (4380) and 5/2− for P+c (4450), which is agreement with the results of the LHCb analysis. In addition, we give predictions for other JP = 3/2± states.
© The Authors, published by EDP Sciences, 2016
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