Mass spectra of the heavy baryons ΛQ and ΣQ(*) from QCD sum rules

We use QCD sum rule approach to calculate the masses of the ground-state Lambda(Q) and Sigma(()(Q)*()) baryons. Contributions of the operators up to dimension six are included in operator product expansion. The resulting heavy baryonic masses from the calculations are m(Lambda b)=5.69 +/- 0.13 GeV, and m(Lambda c)=2.31 +/- 0.19 GeV for Lambda(Q); m(Sigma b)=5.73 +/- 0.21 GeV, m(Sigma b)*=5.81 +/- 0.19 GeV, m(Sigma c)=2.40 +/- 0.31 GeV and m(Sigma c)*=2.56 +/- 0.24 GeV for Sigma(()(Q)*()), respectively, which are in good agreement with the experimental values.