Brazilian Journal of Physics
On-line version ISSN 1678-4448
FORKEL, Hilmar; NAVARRA, Fernando S. and NIELSEN, Marina. Instanton effects in heavy lambda masses. Braz. J. Phys. [online]. 2001, vol.31, n.1, pp. 71-76. ISSN 1678-4448. http://dx.doi.org/10.1590/S0103-97332001000100013.
We calculate the masses of Lb and Lc in the framework of QCD sum rules including instanton contributions. We find that these contributions have the same size of the four quark condensate contribution and improve the Borel stability in both Dirac structures of the baryon correlation function.