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Hi all, since the BR(b->ulnu) changed a lot in the last releases and then it is pretty hard to know exactly its value on large samples of MC, a different approach was used (with respect to the one I proposed in the previous mail). The absolute breco efficiency was calculated in two different MC's: for b->ulnu Vub - generic MC (SP3 + SP4 run2) for b->clnu Generic MC (SP3 + SP4 run2) I added a loose cut on the integrated purity (intpur>50%) since with that low purity (<40%) the mes fit gives large uncertainties. SP3: (eps_t^u/eps_t^sl)_B0 = 0.964 +- 0.067 (eps_t^u/eps_t^sl)_B+ = 1.034 +- 0.068 SP4 (eps_t^u/eps_t^sl)_B0 = 0.884 +- 0.073 (eps_t^u/eps_t^sl)_B+ = 1.090 +- 0.069 TOTAL: (eps_t^u/eps_t^sl)_B0 = 0.927 +- 0.049 (eps_t^u/eps_t^sl)_B+ = 1.062 +- 0.049 (eps_t^u/eps_t^sl)_mean = 0.995 +- 0.035 This ratio seems to be compatible with 1 with an uncertainty of 3.5% Daniele