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Hi all, I recomputed few syst error for B0 and Bch separately: Excl b->ulnu ------------ B0 +-4% Bch +- 2% Hadronization ------------- - fit with non-resonant model: B0 +17.0% Bch -3.4% this effect was already known. B0 is much more affected by resonant vs non-resonant fraction in the model. They go in oppposite direction. This is why the effect in the total sample is small. - fit with multiplicity categories: B0 -6.0% Bch -10.% These numbers seem to be affected by low statistics in the single fits. I am not quite sure we can use them as they are. Fit with no crossfeed in the MC models -------------------------------------- B0 0% Bch +6.8% The size of the effect is reasonable and it impies that we are actually measuring the right quantity. Including these uncertainties (except the ones due to the multiplicity fits) and the new numbers from Alessio for B&D and Fermi motion sustematics I get BR(Bch->Xulnu)/BR(B0->Xulnu) = 0.69 +- 0.17(stat) +- 0.17(syst) (0.69 +- 0.24) Below you find the detailed information Daniele ============================================================================= Effect SYS B+ SYS B0 corr(C) or uncorr(U)? redone? ============================================================================= stat 18.1% 17.4% U MC stat 8.5% 6.5% U ele ID 1% 1% C mu ID 5% 5% C K ID 3.8% 1.9% C tracking 0% 0.8% C neutral 4.7% 3.4% C breco 7.0% 3.8% U binning 2.9% 2.9% U eps_t ratio 4% 4% U B_D 8.% 2.9% U Excl b->u 4.% 2.% C Incl b->u 1.1% 4.8% C had 3% 17% U fermi 19.5% 14.5% C The central values are B0 BRBR = 0.0245504 +- 0.00428074(stat) +- 0.00161026(MC stat) Bch BRBR = 0.0168213 +- 0.00304205(stat) +- 0.00143939(MC stat)