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)
|