Description of the $Î_c$ and $Î_b$ states as molecular states
arXiv:1811.11738 · doi:10.1140/epjc/s10052-019-6665-z
Abstract
In this work we study several $Î_c$ and $Î_b$ states dynamically generated from the meson-baryon interaction in coupled channels, using an extension of the local hidden gauge approach in the Bethe-Salpeter equation. These molecular states appear as poles of the scattering amplitudes, and several of them can be identified with the experimentally observed $Î_c$ states, including the $Î_c(2790)$, $Î_c(2930)$, $Î_c(2970)$, $Î_c(3055)$ and $Î_c(3080)$. Also, for the recently reported $Î_b(6227)$ state, we find two poles with masses and widths remarkably close to the experimental data, for both the $J^P=1/2^-$ and $J^P=3/2^-$ sectors.
27 pages, 24 tables, 2 figures