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Hi all, these are the results for the B0-Bch and muons and electrons breakdown: All: BRBR :0.0154+-0.0031 (here the result is a bit different with respect to the one in the BAD since I change a bit the mes fit strategy to make it more stable). Electrons: BRBR :0.0133+-0.0047 Muons: BRBR :0.0215+-0.0048 B0: BRBR :0.0029+-0.0040 Bch: BRBR :0.0276+-0.0047 As you see, the result for ele-muons is fine. For the B0-Bch the two numbers are very different. I checked all the mes fit and the numbers for those results and they seem to be ok. In order to understand if this is a problem of the background subtraction I performed the scan as a function of Mx. Here the result: http://www.slac.stanford.edu/~daniele/vub/newmxstudy.ps Look at the last page. Plots on the left are the one obtained with the three shapes fit. The left ones are obtained with the bkg subtraction. Top ones are B0's, bottom ones are Bch's. There could be a trend, in opposite directions for B0 and Bch. In priciple in B0's the background could be overestimated and for Bch the opposite. With this statistic is difficult to get a conclusion. BTW, even in the 1.2 GeV bin (the point with the smallest discrepancy) a 2.5 sigmas effect is present. On the generic MC the results for B0 and Bch are reallly compatible and then it cannot be a problem of the machinery. Daniele