We study baryon resonances with heavy flavor in a molecular approach, thus as dynamically generated by baryon-meson scattering. This is accomplished by using a unitary coupled-channel model taking, as bare interaction, the extension of the Weinberg-Tomozawa SU(3) Lagrangian. A special attention is payed to the inclusion of heavy-quark spin symmetry and to the study of the generated baryon resonances that complete the heavy-quark spin multiplets. Our model reproduces the \Lambda_b(5912) and \Lambda_b(5920) baryons, which were recently observed by the LHCb collaboration. According to our analysis, these two states are heavy-quark spin symmetric partners. We also make predictions for few \Xi_b baryon resonances, which belong to the same SU(3)xHQSS multiplets as the \Lambda_b particles.
@article{arxiv.1304.4747,
title = {Odd-parity dynamically generated baryon resonances with beauty flavor},
author = {O. Romanets and C. Garcia-Recio and L. L. Salcedo and J. Nieves and L. Tolos},
journal= {arXiv preprint arXiv:1304.4747},
year = {2013}
}
Comments
Proceedings of the Excited QCD 2013 Workshop, Bjelasnica Mountain, Sarajevo, Bosnia and Herzogovina, February 3-9, 2013