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Hi, this is the spread sheet to compute the error on the ratio bch/b0. http://www.slac.stanford.edu/~daniele/vub/VubB0Bch.xls Just in case you want to play with it... Daniele > > 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) ) > > > ============================================================================= > 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 1.6% 0.8% C > mu ID 5% 5% C (no fit, just a guess) > K ID 3.8% 1.9% C > tracking 0% 0.8% C > neutral 4.7% 3.4% C > breco 3.8% 3.8% U * > binning 2.9% 2.9% U * > eps_t ratio 4% 4% U * > B_D 8.6% 2.6% U > Excl b->u 2.7% 2.7% C * > Incl b->u 1.1% 4.8% C > had 3% 3% U * > fermi 18.8% 15.8% 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) > >