Mass splitting of heavy-baryons from QCD sum rules
Instituto de Física, Universidade de Sāo Paulo,
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.
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 ΞQ , Ξ*Q , ΩQ and Ω*Q using as input the masses of the associated non-strange ΛQ , ΣQ 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 ms . We also predict the hyperﬁne splittings Ω*Q − ΩQ and Ξ*Q − ΞQ .
© Owned by the authors, published by EDP Sciences, 2010