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Hi all, playing with the multiplicity fit scans I discovered that the excess in Mx spectrum that affects the Mx scans is due to a particular mutiplicity category. Compare the fit result for the category 1 charged track and >0 neutrals. data http://www.slac.stanford.edu/~daniele/vub/multi/B0datathesis_multich2ne2fitresults_nocat.eps generic MC http://www.slac.stanford.edu/~daniele/vub/multi/B0genethesis_multich2ne2fitresults_nocat.eps The 3' bin (0.6 GeV - 1.1 GeV) scales properly, while the next one (1.1 GeV - 1.55GeV) show a large excess. The ratio(BR) I get is a factor 2 higher. For Bch the results are perfect. Daniele