Abstract
In this work we study several Xi _c and Xi _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 Xi _c states, including the Xi _c(2790), Xi _c(2930), Xi _c(2970), Xi _c(3055) and Xi _c(3080). Also, for the recently reported Xi _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.
Highlights
Heavy baryons containing one c or b quark have been the subject of intense study
Analyzing the spin-parity of each sector, we find that for the states that arise from P B we have J P = 0− ⊗ 1/2+ = 1/2−, for V B we have degenerate states J P = 1− ⊗ 1/2+ = 1/2−, 3/2− and for P B∗ we have J P = 0− ⊗ 3/2+ = 3/2−
We follow closely the calculations in the previous one. It starts with the J P = 1/2− sector, where we have ten coupled channels similar to the ones we considered for c, only with the c quark replaced by a b quark in each channel
Summary
Heavy baryons containing one c or b quark have been the subject of intense study. Starting from early quark models [1], work along this line has been rather extensive and fruitful [2,3,4,5,6,7,8]. There are many review papers on the subject to which we refer the reader [25,26,27,28,29,30,31,32]. Recent studies of such states using QCD sum rules can be found in Refs. As to molecular states of this type we refer to the work of Ref. As to molecular states of this type we refer to the work of Ref. [15]
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