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Hi all, we have a preliminary calculation of the the ratio R = BR(Bch->Xulnu)/BR(B0->Xulnu) R = 0.69 +- 0.17(stat) +- 0.12(syst) (0.69 +- 0.21) Below you can find the detailed information including the correlation (between B0 and B+) assumed for each term. Few systematic uncertainties have to be recomputed separately in order to have a more precise calculation of the syst error. Daniele and Riccardo V_ik = Vuncorr_ik + Vcorr_ik Vuncorr_ik = sigma_i * sigma_k * delta_ik Vcorr_ik = sigma_i * sigma_k Stot = sqrt( Sum_ik (D(ratio)_i D(ratio)_k * V_ik) )