2024-03-29T11:00:55Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1305702017-03-03T12:42:01Zcom_10261_45com_10261_4com_10261_61col_10261_298col_10261_314
http://hdl.handle.net/10261/130570
10.1103/PhysRevD.92.034011
309665
Compositeness of the strange, charm, and beauty odd parity Lambda states
American Physical Society
2015
artículo
García Recio, Carmen
Hidalgo Duque, Carlos
Nieves, Juan Miguel
Salcedo, Lorenzo Luis
Tolós, Laura
Unitary spin independence
Elementary particle
Symmetry-breaking
Baryon resonances
2015-08-11
14 pages.- 2 figures.- 5 tables
We study the dependence on the quark mass of the compositeness of the lowest-lying odd parity hyperon states. Thus, we pay attention to Lambda-like states in the strange, charm, and beauty sectors which are dynamically generated using a unitarized meson-baryon model. In the strange sector we use a SU(6) extension of the Weinberg-Tomozawa meson-baryon interaction, and we further implement the heavy-quark spin symmetry to construct the meson-baryon interaction when charmed or beauty hadrons are involved. In the three examined flavor sectors, we obtain two J(P) = 1/2- and one J(P) = 3/2(-) Lambda states. We find that the. states which are bound states (the three Lambda(b)) or narrow resonances [one Lambda(1405) and one Lambda(c)(2595)] are well described as molecular states composed of s-wave meson-baryon pairs. The 1/2(-) wide Lambda(1405) and Lambda(c)(2595) as well as the 3/2(-) Lambda(1520) and Lambda(c)(2625) states display smaller compositeness so they would require new mechanisms, such as d-wave interactions.
Ministerio de Economía y Competitividad (España)
Junta de Andalucía
European Commission
Consejo Superior de Investigaciones Científicas (España)
Physical Review - Section D - Particles and Fields 92
2015
034011
14