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Hi, I have tested the hypothesis that the resolution on Mx is not properly reproduced in the following way: I have fitted the central part of the distribution to a gaussian indata and in MC, separately on B0 and Bch. I have then extracted two tentative smearings (0.14 MeV for Bch and 0.10 for B0). The impact of such a smearing on the distribution of Mx is shown in http://www.slac.stanford.edu/~rfaccini/phys/vub/comparisonnormmxhadfit0Bchsmear.eps (before smearing) and http://www.slac.stanford.edu/~rfaccini/phys/vub/0.14.ps after smearing This is just to have a feeling of what would happen if we had mistaken the resolution. The fit results after this smearing are: B0 Q0 BRBR = 0.000848906 +- 0.0147637(stat) +- 0.00226813(MC stat) B0 q1 BRBR = 0.0095807 +- 0.00727223(stat) +- 0.00217021(MC stat) Bch q0 BRBR = 0.02242 +-0.00575436(stat) +- 0.00174128(MC stat) Bch q1 BRBR = 0.0289383 +- 0.0066432(stat) +- 0.00197949(MC stat) there is an overall shift down of 0.0040 but overall effects are not greatly reduced (a part from the diverging error on B0 tht would help our problems, but is not real...) ciao ric