2014/03/18 by Romanets, Olena, Garcia-Recio, Carmen, Nieves, Juan +2
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th)
paper · doi:10.48550/arxiv.1403.4515
We study baryon resonances with heavy flavor in a molecular approach, thus as dynamically generated by meson-baryon scattering. This is accomplished by using a unitary coupled-channel model taking, as bare interaction, the extension to four flavors and spin symmetry of the Weinberg-Tomozawa interaction potential. A special attention is paid to the inclusion of heavy-quark spin symmetry and to the studies of the generated baryon resonances which complete the heavy-quark spin multiplets. We reproduce few charmed and strange baryon resonances found experimentally, that is, Λc(2595), Λc(2625), Ξc(2790), Ξc(2815), and make predictions for more states. The bottom-flavored Λb(5912) and Λb(5920) states, found by the LHCb collaboration, are also obtained by our model, thus these resonances can be interpreted as molecular states. We also study Ξb resonances, which belong to the same SU(3) x HQSS multiplets as the observed Λb particles. Finally we analyze hidden-charm baryon resonances. In this sector, we predict seven N-like and five Δ-like states with masses around 4 GeV, most of them as bound states, and compare them with predictions from other models. The predicted states can be searched for in future experiments that involve studies of heavy-flavor physics, e.g. PANDA/FAIR, where charm physics will be analyzed.