I have introduced the relation
m_B = m_b + Lambda_bar + lambda/(2*m_B)
which changes the a-m_b correlations by a tiny amount:
http://www.slac.stanford.edu/~elsen/amb.pdf
I would suggest to stick to a variation of +-0.15 for m_b nevertheless.
This corresponds to -0.8 for the correlation in lambda and Lambda_bar.
Eckhard
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