Updates of Semileptonic Results for Winter 2004
The changes of this update with respect to the previous status are
described here. The averages are also
summarized in a
writeup with (partially) more detailed documentation.
All analyses are rescaled to a common set of input parameters defined
in common.param.
Spreadsheet with the breakdowns of the errors can be found for
incl |Vub| and excl |Vub|.
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+/- 0.52 |
input parameters |
Phys.Lett.B395:373-,1997 |
| CLEO |
2.11+/- 0.13+/- 0.18 |
input parameters |
Phys.Rev.Lett.82:3746-,1999 |
| BELLE |
2.20+/- 0.12+/- 0.39 |
input parameters |
Phys.Lett.B526:258-268,2002 |
| Average
| 2.14+/- 0.20
| chi2/dof = 0.3/2 (CL = 0.846)
| eps gif |
nada
Exclusive Branching Fraction: B0 -> D*lnu
This is a one-dimensional fit for the average branching fraction.
| Experiment |
BF (rescaled) [%] |
Parameters |
Remarks |
| ALEPH |
5.74 +/- 0.26 +/- 0.36 |
input parameters
| Phys.Lett.B395:373-,1997 |
| OPAL (excl) |
5.48 +/- 0.19 +/- 0.50 |
input parameters |
Phys.Lett.B482:15-,2000, exclusive reco. |
| OPAL (partial reco) |
6.19 +/- 0.27 +/- 0.58 |
input parameters |
Phys.Lett.B482:15-,2000, partial reco. |
| DELPHI (partial reco) |
5.03 +/- 0.13 +/- 0.36 |
input parameters
| Phys.Lett.B510:55-,2001, partial reco. |
| BELLE |
4.70 +/- 0.23 +/- 0.43 |
input parameters
| Phys.Lett.B526:247-,2002 |
| CLEO |
6.14 +/- 0.19 +/- 0.39 |
input parameters
| Phys.Rev.Lett.89:081803,2002 |
| DELPHI (excl) |
5.77 +/- 0.22 +/- 0.57 |
input parameters |
submitted to P.L., exclusive reco. |
| BABAR |
4.60 +/- 0.03 +/- 0.27 |
input parameters |
preliminary |
| Average |
5.13 +/- 0.19 |
chi2/dof = 17.2/7 (CL = 0.02) |
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 (e tag) |
09.75 +/- 0.50 +/- 0.39 |
input parameters
| Phys.Lett.B318:397-, 1993 |
| BABAR (breco tag) |
10.40 +/- 0.50 +/- 0.46 |
input parameters
| conference paper (hep-ex/0204001) |
| BELLE (l tag) |
10.96 +/- 0.12 +/- 0.50 |
input parameters
| Phys.Lett.B547:181-, 2002 |
| BABAR (e tag) |
10.91 +/- 0.18 +/- 0.29 |
input parameters
| Phys.Rev.D67:031101, 2003 |
| 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 |
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 averages
are determined in a two-dimensional fit that is completely systematics
limited.
| Experiment |
|Vcb| F(1) (rescaled) [10-3] |
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) |
38.5 +/- 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 +/- 2.3 |
1.48 +/- 0.21 +/- 0.27 |
0.95/0.42/0.61 |
input parameters
| Phys.Lett.B482:15-,2000 |
| DELPHI (partial reco) |
36.9 +/- 1.4 +/- 2.5 |
1.50 +/- 0.14 +/- 0.37 |
0.94/0.77/0.79 |
input parameters
| Phys.Lett.B510:55-,2001 |
| BELLE |
36.3 +/-1.9 +/- 1.9 |
1.45 +/- 0.16 +/- 0.20 |
0.91/0.67/0.77 |
input parameters
| Phys.Lett.B526:247-,2002 |
| CLEO |
43.3 +/- 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) |
38.7 +/- 1.8 +/- 2.2 |
1.32 +/- 0.15 +/- 0.33 |
0.89/0.48/0.57 |
input parameters
| preliminary |
| BABAR |
33.9 +/- 0.2 +/- 1.1 |
1.23 +/- 0.02 +/- 0.27 |
0.92/0.49/0.52 |
input parameters
| preliminary |
| Average |
36.5 +/- 0.8 |
1.47 +/- 0.13 |
0.88/0.40/0.49 |
chi2/dof = 29.7/14 |
eps 1 gif 1
eps 2 gif 2 |
With F(1) = 0.91 +/- 0.04theo, this yields |Vcb| = (40.1
+/-0.9exp +/- 1.8theo)10-3
nada
Exclusive |Vcb|G(1)
This table and the plots in the last row document the two-dimensional
simultaneous fit to |Vcb|*G(1) and rho2. Note: The averages
are determined in a two-dimensional fit.
| Experiment |
|Vcb| G(1) (rescaled) [10-3] |
rho2 (rescaled) |
Correlation (stat/syst/total) |
Parameters |
Remarks |
| ALEPH |
39.2+/- 10.0+/- 6.5 |
0.97+/- 0.98+/- 0.38 |
0.98/0.99/0.96 |
input parameters |
Phys.Lett.B395:373-,1997 |
| CLEO |
44.4+/- 5.8+/- 3.5 |
1.27+/- 0.25+/- 0.14 |
0.95/0.97/0.96 |
input parameters |
Phys.Rev.Lett.82:3746-,1999 |
| BELLE |
41.7+/- 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 |
41.8+/- 3.7 |
1.15+/- 0.16 |
0.93/0.91/0.90 |
chi2/dof = 0.3/4 |
eps 1 gif 1
eps 2 gif 2
|
With G(1)=1.04+/-0.06theo, this gives |Vcb| = (40.2 +/-3.6exp +/-2.3theo) 10-3
nada
|Vub| in inclusive semileptonic B decays
The errors in the table are uncorrelated (statistical and experimental
systematic) and correlated (experimental and theoretical). The
procedure for this average is documented in the
writeup. The average is currently based on the results from the
Upsilon(4S), i.e. from the BABAR, BELLE, and CLEO collaborations.
| Experiment |
Value [10-3] |
Parameters |
References |
Remarks |
| ALEPH |
4.12 +/- 0.67 +/- 0.71 |
|
|
neural net (not used in average) |
| L3 |
5.70 +/- 1.00 +/- 1.40 |
|
|
cut and count (not used in average) |
| DELPHI |
4.07 +/- 0.65 +/- 0.61 |
|
|
mX (not used in average) |
| OPAL |
4.00 +/- 0.71 +/- 0.71 |
|
|
neural net (not used in average) |
| CLEO (endpoint) |
4.11 +/- 0.20 +/- 0.65 |
input
| Phys.Rev.Lett.88:231803,2002 |
2.2 < p < 2.6 |
| BABAR (endpoint) |
4.31 +/- 0.25 +/- 0.79 |
input
| hep-ex/0207081 |
2.3 < p < 2.6, fu from CLEO |
| BELLE (m_{ X} - Q^{2}) |
4.63 +/- 0.45 +/- 0.63 |
input
| Phys.Rev.Lett.92:101801,2004 (hep-ex/0311048) |
mX - Q2, tag with annealing method |
| BABAR (m_{ X}) |
5.04 +/- 0.37 +/- 0.65 |
input
| Phys.Rev.Lett.92:071802,2004 (hep-ex/0307062) |
mX, BRECO tag |
| BELLE (endpoint) |
3.99 +/- 0.20 +/- 0.73 |
input
| BELLE-CONF-0325 |
2.3 < p < 2.6, fu from CLEO |
| Average |
4.57 +/- 0.61 |
chi2/dof = 5.7/4 (CL = 0.22) |
|
eps gif
all: eps gif
|
nada
|Vub| from exclusive decays
Measurements using the entire q2 range
| Experiment |
Mode |
BF [10-4] |
|Vub| (rescaled) [10-3] |
Reference |
| CLEO |
B0-> rho- l+ nu |
2.69 +/-0.41 +0.35/-0.40 +/-0.50 |
3.24 +/-0.25 +0.21/-0.24 +/-0.58 |
Phys. Rev. D 61, 052001 (2000) |
| BABAR |
B0-> rho- l+ nu |
3.29 +/-0.42 +/-0.47 +/-0.60 |
3.59 +/-0.23 +/-0.26 +/-0.66 |
Phys. Rev. Lett. 90, 181801 (2003) |
| Belle |
B+-> omega l+ nu |
1.3 +/-0.4 +/-0.2 +/-0.3 |
3.1 +/-0.2 +/-0.2 +/-0.6 |
submitted to Phys. Rev. Lett. |
The uncertainties on |Vub| are statistical, experimental
systematic and theoretical, respectively.
Measurements using different bins of q2
| Experiment |
Mode |
BF [10-4] |
|Vub| [10-3] |
Reference |
| CLEO |
B0-> pi- l+ nu |
1.33 +/-0.18 +/-0.11 +/-0.01 +/-0.07 |
3.24 +/-0.22 +/-0.13 +0.55/-0.39 +/-0.09 |
Phys. Rev. D 68, 072003 (2003) |
| CLEO |
B0-> rho- l+ nu |
2.17 +/-0.34 +0.47/-0.54 +/-0.41 +/-0.01 |
3.00 +/-0.21 +0.29/-0.35 +0.49/-0.38 +/-0.28 |
Phys. Rev. D 68, 072003 (2003) |
The uncertainties on |Vub| are statistical, experimental
systematic, theoretical and signal form-factor shape, respectively.
Last update: 2004/03/23 Urs Langenegger and Christoph Schwanda
