The molecular nature of some $\hat{I}{\text{c◯}}_c^0$ states

Abstract

A vector meson exchange model based on effective Lagrangians is used to build the meson--baryon interaction in the charm $+1$, strangeness $-2$ and isospin $0$ sector. The s-wave scattering amplitudes resulting from the unitarization in coupled-channels show two resonances with masses and widths that are in very good agreement with those of the experimental $\hat{I}{\text{c◯}}_c(3050{)}^0$ and $\hat{I}{\text{c◯}}_c(3090{)}^0$ states observed by the LHCb collaboration. The interpretation of these resonances as pseudoscalar meson--baryon molecules would mean the assignment $J^P=1/2^{-}$ to their spin--parity.

6 pages, 2 figures, 2 tables, contribution to the proceedings of the XXII International Conference on Few-Body Problems in Physics (FB22) 2018, July 9-13, Caen, France. arXiv admin note: substantial text overlap with arXiv:1812.03890