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Compositeness of the strange, charm, and beauty odd parity Lambda states

AuthorsGarcía Recio, Carmen; Hidalgo Duque, Carlos ; Nieves, Juan Miguel ; Salcedo, Lorenzo Luis; Tolós, Laura
KeywordsUnitary spin independence
Elementary particle
baryon resonances
Issue Date11-Aug-2015
PublisherAmerican Physical Society
CitationPhysical Review - Section D - Particles and Fields 92 (3): 034011 - 14 (2015)
AbstractWe 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.
Description14 pages.- 2 figures.- 5 tables
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevD.92.034011
Appears in Collections:(ICE) Artículos
(IFIC) Artículos
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