EPJ Web of Conferences 3, 07011 (2010)
https://doi.org/10.1051/epjconf/20100307011

Mass splitting of heavy-baryons from QCD sum rules

¹ Instituto de Física, Universidade de Sāo Paulo, C.P. 66318, 05389-970 Sao Paulo, SP, Brazil
² Laboratoire de Physique Théorique et Astroparticules, CNRS-IN2P3 & Université de Montpellier II, Case 070, Place Eugène Bataillon, 34095 - Montpellier Cedex 05, France.

^a e-mail: rma@if.usp.br
^b e-mail: snarison@yahoo.fr
^c e-mail: mnielsen@if.usp.br

Abstract

We extract the heavy-baryons mass-splittings due to S U (3) breaking using double ratios of QCD sum rules. We evaluate the masses of the strange-heavy baryons Ξ_Q , Ξ*_Q , Ω_Q and Ω*_Q using as input the masses of the associated non-strange Λ_Q , Σ_Q and Σ*_Q baryons. We notice that the leading term controlling the mass-splittings is the ratio of the quark condensate and not the running mass m_s . We also predict the hyperfine splittings Ω*_Q − Ω_Q and Ξ*_Q − Ξ_Q .