

 Combine All SLD Ab measurements (Revised Winter 2001 - May/20/01)

 Lepton: 93-95  PRL
         96-98  Giulia and Jorge's thesis
 Jet-Q:  93-95 PRL + 96-98  R17
 Kaon:   94-95 PRL
 VTX+K:  96-98 R17 analysis

 Statistical correlation between analysis:
 A formal tests using individual analysis event by event weights
 based on Winter-98 data. The correct for actual analysis data
 periods not quite same:
                   Win-98 data    actual analysis data periods
                   -----------    -----------------------------
 JetQ   vs Lepton      22.1         22.1       (~100% overlap)
 JetQ   vs Vtx+K       34.3         32.0       (87%)
 JetQ   vs Ktag        23.1          8.3       (13%)
 Lepton vs Vtx+K       15.9         14.5       (83%)
 Lepton vs Ktag        10.4          4.3       (17%)
 Vtx+K  vs Ktag          0            0   (93-5 separate from 96-98)

 The corrections are based on  JetQ 93-5,96-98  wt=13/87
                               Lept 93-5,96-98  wt=17/83
                               Ktag 94-5 only   wt=100/0
                               Vtx+K 96-98 only wt=0/100
 Corr-coef correct ~ sqrt(data period overlap weight fraction)*Corr0

Nmeas, Nuncorr    4    4   Average  Lepton   Jet-Q   K-tag   Vtx+K
Measurement values         0.9127   0.9253  0.9067  0.8550  0.9126
Statistical correlation Matrix
 1.0000 0.2210 0.0430 0.1450
 0.2210 1.0000 0.0830 0.3200
 0.0430 0.0830 1.0000 0.0000
 0.1450 0.3200 0.0000 1.0000
Data Statistics            0.0149   0.0296  0.0197  0.0877  0.0189
MC statistics              0.0017   0.0000  0.0000  0.0026  0.0034
ML weights                 0.0006   0.0032  0.0000  0.0000  0.0000
Self-calib statistics      0.0077   0.0000  0.0135  0.0000  0.0130
Tracking inefficiency      0.0042   0.0048  0.0079  0.0060  0.0016
Vtx Q detector effect      0.0017   0.0000  0.0000  0.0000  0.0035
K-tag detector effect      0.0004   0.0000  0.0000  0.0092  0.0007
Jet axis smearing          0.0013   0.0071  0.0000  0.0000  0.0000
mu background level        0.0005   0.0029  0.0000  0.0000  0.0000
e  background level        0.0005   0.0025  0.0000  0.0000  0.0000
mu background asymmetry    0.0003   0.0014  0.0000  0.0000  0.0000
e  background asymmetry    0.0003   0.0014  0.0000  0.0000  0.0000
Neural Net Training        0.0008   0.0044  0.0000  0.0000  0.0000
Jet-Q calibration syst.    0.0049   0.0000  0.0156  0.0000  0.0000
Vtx-Q calibration syst.    0.0038   0.0000  0.0000  0.0000  0.0077
b-tag purity               0.0064   0.0092  0.0054  0.0009  0.0060
L/D weights                0.0002   0.0012  0.0000  0.0000  0.0000
K-tag phys. sys.           0.0022   0.0000  0.0000  0.0975  0.0028
BR(b->l)                   0.0006   0.0032  0.0000  0.0000  0.0000
BR(b->c->l)                0.0006   0.0030  0.0000  0.0000  0.0000
BR(b->cbar->l-)            0.0007   0.0036  0.0000  0.0000  0.0000
BR(b->tau->l)              0.0003   0.0018  0.0000  0.0000  0.0000
BR(b->J/psi->l+l-)         0.0005   0.0026  0.0000  0.0000  0.0000
BR(c->l)                   0.0002   0.0012  0.0000  0.0000  0.0000
B mixing                   0.0020   0.0107  0.0000  0.0000  0.0000
B-> D** l nu frac          0.0006   0.0034  0.0000  0.0000  0.0000
D->l spectrum              0.0009   0.0049  0.0000  0.0000  0.0000
B->DDX                     0.0014   0.0076  0.0000  0.0000  0.0000
B->D0/D+                   0.0002   0.0012  0.0000  0.0000  0.0000
Bs fraction                0.0008   0.0034  0.0000  0.0154  0.0000
Lambda b fraction          0.0006   0.0026  0.0000  0.0162  0.0000
b frag xEb                 0.0007   0.0013  0.0000  0.0060  0.0009
c frag xEc                 0.0006   0.0028  0.0000  0.0000  0.0002
b frag shape               0.0005   0.0019  0.0000  0.0128  0.0000
g->bb                      0.0009   0.0018  0.0012  0.0017  0.0003
g->cc                      0.0002   0.0002  0.0000  0.0000  0.0003
Polarization               0.0049   0.0052  0.0049  0.0060  0.0048
QCD correction             0.0035   0.0048  0.0033  0.0026  0.0031
BR(Z->b bbar)              0.0009   0.0004  0.0000  0.0001  0.0017
BR(Z->c cbar)              0.0004   0.0007  0.0000  0.0002  0.0006
Ac variation               0.0011   0.0028  0.0011 -0.0006  0.0004
** Total error             0.0210   0.0378  0.0307  0.1344  0.0263
** Systematic error sum    0.0148   0.0235  0.0236  0.1019  0.0183
Weight fraction            1.0000   0.1853  0.3116  0.0079  0.4952

Combined result =  0.9127+- 0.0149+- 0.0148
