QCD sum rules study of Ξ_c and Ξ_b baryons

Details QCD sum rules study of Ξ_c and Ξ_b baryons QCD sum rules study of Ξ_c and Ξ_b baryons

2007-08-22

arxiv.org/abs/0708.3030v3

Phys.Lett.B658:40-44,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

revised version accepted for publication in Phys. Lett. B. Includes a prediction to the state Omega_b(ssb)

Scientific paper

10.1016/j.physletb.2007.10.054

We use QCD sum rules to study the masses of the baryons $\Xi_c$ and $\Xi_b$. We work with a current where the strange and the light quarks are in a relative spin zero, at leading order in $\alpha_s$. We consider the contributions of condensates up to dimension six. For $\Xi_b$ we get $m_{\Xi_{b}}= (5.75\pm 0.25) {\rm GeV}$, and for $\Xi_c$ we get $m_{\Xi_{c}}= (2.5\pm 0.2) {\rm GeV}$, both in excelent agreement with the experimental values. We also make predictions to the state $\Omega_b(ssb)$ obtaining m_{\Omega_{b}}= (5.82\pm 0.23) GeV.

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