QCD sum rules study of Ξc and Ξb baryons

We use QCD sum rules to study the masses of the baryons Ξc and Ξb. We work with a current where the strange and the light quarks are in a relative spin zero, at leading order in αs. We consider the contributions of condensates up to dimension six. For Ξb we get mΞb=(5.75±0.25) GeV, and for Ξc we get mΞc=(2.5±0.2) GeV, both in excellent agreement with the experimental values. We also make predictions to the state Ωb(ssb) obtaining mΩb=(5.82±0.23) GeV.