Investigation of ΛQ and ΞQ baryons in the heavy quark-light diquark picture

We apply a new mass formula which is derived analytically in the relativistic flux tube model to the mass spectra of Lambda(Q) and Xi(Q) (Q = c or b quark) baryons. To this end, the heavy quark-light diquark picture is employed. We find that all masses of the available Lambda(Q) and Xi(Q) states can be understood well. The assignments to these states do not appear to contradict the strong decay properties. Lambda(c)(2760)(+) and Xi(c)(2980) are assigned to the first radial excitations with J(P) = 1/2(+). Lambda(c)(2940)(+) and Xi(c)(3123) might be the 2P states. The Lambda(c)(2880)(+) and Xi(c)(3080) are the good 1D candidates with J(P) = 5/2(+). Xi(c)(3055) is likely to be a 1D state with J(P) = 3/2(+). Lambda(b)(5912)(0) and Lambda(b)(5920)(0) favor the 1P assignments with J(P) = 1/2(-) and 3/2(-), respectively. We propose a search for the (Lambda) over tilde (c2)(5/2(-)) state which can help to distinguish the diquark and three-body schemes.