Updates of Semileptonic Results for the Summer 2003
The changes of this update with respect to the status of winter 2003
are described here.
All analyses are rescaled to a common set of input parameters defined
in common.param.
A spreadsheet with the breakdowns of the errors can be found as xls
and gnumeric.
nada
Exclusive Branching Fraction: B0 -> D*lnu
This is a one-dimensional fit for the average branching fraction.
| Experiment |
BF (rescaled) |
Parameters |
Remarks |
| ALEPH |
5.75 +/- 0.26 +/- 0.36 |
input parameters
| Phys.Lett.B395:373-,1997 |
| OPAL (excl) |
5.44 +/- 0.19 +/- 0.41 |
input parameters |
Phys.Lett.B482:15-,2000, exclusive reco. |
| OPAL (partial reco) |
6.15 +/- 0.27 +/- 0.58 |
input parameters |
Phys.Lett.B482:15-,2000, partial reco. |
| DELPHI (partial reco) |
5.02 +/- 0.13 +/- 0.36 |
input parameters
| Phys.Lett.B510:55-,2001, partial reco. |
| BELLE |
4.78 +/- 0.23 +/- 0.43 |
input parameters
| Phys.Lett.B526:247-,2002 |
| CLEO |
6.25 +/- 0.19 +/- 0.39 |
input parameters
| Phys.Rev.Lett.89:081803,2002 |
| DELPHI (excl) |
5.70 +/- 0.20 +/- 0.41 |
input parameters |
preliminary, exclusive reco. |
| BABAR |
4.68 +/- 0.03 +/- 0.28 |
input parameters |
preliminary |
| Average |
5.20 +/- 0.19 |
chi2/dof = 17.0/7 (CL = 0.018) |
eps gif |
nada
Exclusive Branching Fraction: B0 -> Dlnu
This is a one-dimensional fit for the average branching fraction.
| Experiment |
BF (rescaled) |
Parameters |
Remarks |
| ALEPH |
2.42 +/- 0.20+/- 0.50 |
input parameters |
Phys.Lett.B395:373-,1997 |
| CLEO |
2.11+/- 0.13+/- 0.17 |
input parameters |
Phys.Rev.Lett.82:3746-,1999 |
| BELLE |
2.21+/- 0.12+/- 0.39 |
input parameters |
Phys.Lett.B526:258-268,2002 |
| Average
| 2.14+/- 0.20
| chi2/dof = 0.3/2 (CL = 0.840)
| eps gif |
nada
Inclusive Semileptonic Branching Fraction for B+/B0 Admixture: B -> Xlnu
This is a one-dimensional fit for the average branching fraction.
| Experiment |
Rescaled Value |
Input |
Remarks |
| ARGUS |
09.75 +/- 0.50 +/- 0.39 |
input parameters
| Phys. Lett. B318:397, 1993, e-tag |
| BABAR (breco) |
10.40 +/- 0.50 +/- 0.46 |
input parameters
| preliminary, hep-ex/0204001, breco |
| BELLE (l tag) |
10.96 +/- 0.12 +/- 0.50 |
input parameters
| Phys.Lett.B547:181, 2002, e-tag |
| BABAR (e tag) |
10.91 +/- 0.18 +/- 0.29 |
input parameters
| Phys. Rev. D67:031101, 2003, e-tag |
| BELLE (breco) |
11.19 +/- 0.20 +/- 0.31 |
input parameters
| breco-tag, preliminary |
| CLEO (l tag, 2003) |
10.91 +/- 0.08 +/- 0.30 |
input parameters
| e-tag, preliminary, superceedes PRL 76:1570 (1996) |
| Average |
10.90 +/- 0.23 |
chi2/dof = 5.0/5 (CL = 0.418) |
eps gif |
In hep-ex/0212036, the LEP HF steering group quotes BF(B ->
Xlnu) = 10.65 +/- 0.23 at LEP. This result is model-dependent in
the sense that its error includes a contribution of 0.14 for the
modeling of b->Xl.
There are at least two possibilities to derive Vcb from the inclusive
semileptonic BF
- Use Falk and Luke as done in Phys.Rev.Lett.87:251808,2001
- Use Bauer et al as done in hep-ex/0307046.
The first approach needs an average lambdaBar and lambda1 which does
not exist currently. This is highly nontrivial to do correctly. The
second approach uses the different moments directly -- taking into
account all the correlations -- and fits the semileptonic width
simultaneously to the moments. It is foreseen to use the second
approach in the future.
Exclusive |Vcb| F(1)
This table and the plots in the last row document the two-dimensional
simultaneous fit to |Vcb|*F(1) and rho2. Note: The fit is
two-dimensional and systematics limited, no confidence level is given
at the moment.
| Experiment |
|Vcb| F(1) [10-3] (rescaled) |
rho2 (rescaled) |
Correlation (stat/syst/total) |
Parameters |
Remarks |
| ALEPH |
33.6 +/- 2.1 +/- 1.6 |
0.75 +/- 0.25 +/- 0.37 |
0.94/0.60/0.72 |
input parameters
| Phys.Lett.B395:373-,1997 |
| OPAL (partial reco) |
38.4 +/- 1.2 +/- 2.4 |
1.25 +/- 0.14 +/- 0.39 |
0.77/0.70/0.71 |
input parameters
| Phys.Lett.B482:15-,2000 |
| OPAL (excl) |
39.1 +/- 1.6 +/- 1.8 |
1.49 +/- 0.21 +/- 0.26 |
0.95/0.44/0.65 |
input parameters
| Phys.Lett.B482:15-,2000 |
| DELPHI (partial reco) |
36.8 +/- 1.4 +/- 2.5 |
1.52 +/- 0.14 +/- 0.37 |
0.94/0.77/0.79 |
input parameters
| Phys.Lett.B510:55-,2001 |
| BELLE |
36.7 +/-1.9 +/- 1.9 |
1.45 +/- 0.16 +/- 0.20 |
0.91/0.67/0.77 |
input parameters
| Phys.Lett.B526:247-,2002 |
| CLEO |
43.6 +/- 1.3 +/- 1.8 |
1.61 +/- 0.09 +/- 0.21 |
0.87/0.62/0.67 |
input parameters
| Phys.Rev.Lett.89:081803,2002 |
| DELPHI (excl) |
38.5 +/- 1.8 +/- 2.1 |
1.32 +/- 0.15 +/- 0.33 |
0.89/0.24/0.40 |
input parameters
| preliminary |
| BABAR |
34.1 +/- 0.2 +/- 1.3 |
1.23 +/- 0.02 +/- 0.28 |
0.92/0.50/0.52 |
input parameters
| preliminary |
| Average |
36.7 +/- 0.8 |
1.44 +/- 0.14 |
0.91/0.56/0.56 |
chi2/dof = 30.3/14 |
eps 1 gif 1
eps 2 gif 2 |
With F(1) = 0.91 +/- 0.04theo, this yields |Vcb| = (40.2
+/-0.9exp +/- 1.8theo)10-3
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Exclusive |Vcb|G(1)
This table and the plots in the last row document the two-dimensional
simultaneous fit to |Vcb|*F(1) and rho2. Note: The fit is
two-dimensional, no confidence level is given at the moment.
| Experiment |
|Vcb| G(1) [10-3] (rescaled) |
rho2 (rescaled) |
Correlation (stat/syst/total) |
Parameters |
Remarks |
| ALEPH |
40.0+/- 10.0+/- 6.4 |
1.02+/- 0.98+/- 0.37 |
0.98/0.99/0.96 |
input parameters |
Phys.Lett.B395:373-,1997 |
| CLEO |
44.9+/- 5.8+/- 3.5 |
1.27+/- 0.25+/- 0.14 |
0.95/0.98/0.96 |
input parameters |
Phys.Rev.Lett.82:3746-,1999 |
| BELLE |
41.8+/- 4.4 +/- 5.2 |
1.12+/- 0.22+/- 0.14 |
0.96/0.96/0.92 |
input parameters |
Phys.Lett.B526:258-268,2002 |
| Average |
42.1+/- 3.7 |
1.15+/- 0.16 |
0.93/0.91/0.90 |
chi2/dof = 0.3/4 (CL = 0.99) |
eps 1 gif 1
eps 2 gif 2
|
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|Vub| in inclusive semileptonic B decays
| Experiment |
Rescaled Value |
Parameters |
Remarks |
| ALEPH |
4.12 +/- 0.67 +/- 0.76 |
|
neural net |
| L3 |
5.70 +/- 1.00 +/- 1.40 |
|
cut and count |
| DELPHI |
4.07 +/- 0.65 +/- 0.61 |
|
mX |
| OPAL |
4.00 +/- 0.71 +/- 0.71 |
|
neural net |
| LEP Average |
4.09 +/- 0.37 +/- 0.56 |
|
|
| CLEO (endpoint) |
4.08 +/- 0.22 +/- 0.61 |
|
2.2 < p < 2.6 |
| BABAR (endpoint) |
4.43 +/- 0.26 +/- 0.67 |
|
2.3 < p < 2.6 |
| CLEO (m_{ X} - Q^{2}) |
4.05 +/- 0.61 +/- 0.65 |
|
mX - Q2 |
| BELLE (m_{ X} with D^{*}l#nu tag) |
5.00 +/- 0.64 +/- 0.53 |
|
mX with D*lnu tag |
| BELLE (m_{ X} - Q^{2}) |
3.96 +/- 0.47 +/- 0.52 |
|
Annealing method |
| BABAR (m_{ X}) |
4.62 +/- 0.38 +/- 0.49 |
|
BRECO tag |
| BELLE (endpoint) |
3.99 +/- 0.25 +/- 0.59 |
|
2.3 < p < 2.6 |
| No combination |
|
|
eps gif |
Last update: 07/28/03 (UL)
