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Alessio and I have gone through the exercise of calculating the chi^2 of the consistency of our data with a grid of values of lambda_bar and lambda_1. This is an evolution of Urs's study in http://www.slac.stanford.edu/cgi-bin/lwgate/VUB-RECOIL/archives/vub-recoil.200306/Author/article-35.html since it is done with the full reweighting and with a chi^2 on the background subtracted distribution of Mxhadfit. This are done with the new 1D reweighting and therefore the default is BRBR = 0.0219733 +- 0.00265286(stat) +- 0.000977835(MC stat) The raw results are in http://www.slac.stanford.edu/~asarti/recoil/newchiscan/ Out of them, I produced the plot of the deltaChi^2 wrt to the minimum as a function of lambda_bar and l1 in http://www.slac.stanford.edu/~rfaccini/phys/vub/SF/ll_zcol.eps http://www.slac.stanford.edu/~rfaccini/phys/vub/SF/ll_cont.eps where the three contours are at deltaChi^2=1 , deltaChi^2 =2.25 (1 sigma) and deltaChi^2=5. There is a funny rectangle at the bottom, but this is just a plotting feature. The ellipse represents the assumed values in our analysis. It is to be noted that the fit prefers slightly higher values of lambda_bar and of lambda_1. The long tail from CLEO is completely excluded. In order to show the level of consistency of our assumed values and the fit results, I show the fit projections: deltaChi^2 vs lambda_bar http://www.slac.stanford.edu/~rfaccini/phys/vub/SF/lbproj.eps vs lambda_1 http://www.slac.stanford.edu/~rfaccini/phys/vub/SF/l1proj.eps and vs BrBr http://www.slac.stanford.edu/~rfaccini/phys/vub/SF/brbr.eps In these plots the arrows indicate the 1sigma contours of our assumed values. I would say that we are consistent although the central value of our fit lies ~1sigma from our assumed value, which is possible. I would say this is the way we should go but I would not be ready to make these plots ufficial yet: what is the impact of the detector? Is there a binning effect? Claiming that we get an error on BRBR of about 10% which is what we would claim from the last plot I show needs lots more Xchecks. It basically means that we discard this configuration http://www.slac.stanford.edu/~asarti/recoil/newchiscan/RicQ2_b5l6_var.eps at the two sigma level wrt to the best chi^2 which is obtained in http://www.slac.stanford.edu/~asarti/recoil/newchiscan/RicQ2_b4l10_var.eps can we get together to discuss this sometime today? can we use these plots in the discusion with CLEO anyhow? ciao ric