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

Experiment BF (rescaled) Parameters Remarks
ALEPH 5.93 +/- 0.26 +/- 0.39 input     parameters Phys.Lett.B395:373-,1997
OPAL (excl) 5.59 +/- 0.19 +/- 0.42 input     parameters Phys.Lett.B482:15-,2000, exclusive reco.
OPAL (partial reco) 6.31 +/- 0.27 +/- 0.60 input     parameters Phys.Lett.B482:15-,2000, partial reco.
DELPHI (partial reco) 5.15 +/- 0.13 +/- 0.37 input     parameters Phys.Lett.B510:55-,2001, partial reco.
BELLE 4.78 +/- 0.23 +/- 0.43 input     parameters Phys.Lett.B526:247-,2002
CLEO 6.22 +/- 0.19 +/- 0.39 input     parameters Phys.Rev.Lett.89:081803,2002
BABAR 4.89 +/- 0.03 +/- 0.29 input     parameters preliminary
DELPHI (excl) 5.84 +/- 0.20 +/- 0.43 input     parameters preliminary, exclusive reco.
Average 5.33 +/- 0.20 chi2/dof = 14.1/7 (CL = 0.049) eps gif
nada

Exclusive Branching Fraction: B0 -> Dlnu

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 2.20+/- 0.12+/- 0.39 input     parameters Phys.Lett.B526:258-268,2002
Average 2.14+/- 0.20 chi2/dof = 0.3/2 (CL = 0.840) eps gif
nada

Inclusive Semileptonic Branching Fraction for B+/B0 Admixture: B -> Xlnu

Experiment Rescaled Value Input Remarks
ARGUS 09.73 +/- 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) 10.94 +/- 0.12 +/- 0.50 input     parameters Phys.Lett.B547:181, 2002, e-tag
BABAR (e tag) 10.89 +/- 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) 10.88 +/- 0.08 +/- 0.30 input     parameters e-tag, preliminary, superceedes PRL 76:1570 (1996)
Average 10.89 +/- 0.23 chi2/dof = 5.1/5 (CL = 0.410) 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.


Exclusive |Vcb| F(1)

This table and the plots in the last row document the two-dimensional simultaneous fit to |Vcb|*F(1) and rho^2.
Experiment |Vcb| F(1) (rescaled) rho2 (rescaled) Correlation (stat/syst/total) Parameters Remarks
ALEPH 34.0 +/- 2.1 +/- 1.6 0.75 +/- 0.25 +/- 0.37 0.94/0.59/0.71 input     parameters Phys.Lett.B395:373-,1997
OPAL (partial reco) 38.9 +/- 1.2 +/- 2.5 1.25 +/- 0.14 +/- 0.39 0.77/0.69/0.70 input     parameters Phys.Lett.B482:15-,2000
OPAL (excl) 39.6 +/- 1.6 +/- 1.9 1.49 +/- 0.21 +/- 0.26 0.95/0.43/0.64 input     parameters Phys.Lett.B482:15-,2000
DELPHI (partial reco) 37.4 +/- 1.4 +/- 2.5 1.52 +/- 0.14 +/- 0.37 0.94/0.76/0.78 input     parameters Phys.Lett.B510:55-,2001
BELLE 36.6 +/-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) 39.0 +/- 1.8 +/- 2.1 1.32 +/- 0.15 +/- 0.33 0.89/0.24/0.40 input     parameters preliminary
Average 38.6 +/- 1.1 1.58 +/- 0.15 0.88/0.49/0.55 chi2/dof = 22.8/12 (CL = 0.029) eps 1   gif 1   eps 2   gif 2  

With F(1) = 0.91 +/- 0.04, this yields |Vcb| = (42.4 +/-1.2exp +/- 1.9theo)10-3 nada

Exclusive |Vcb|G(1)

Experiment |Vcb| G(1) (rescaled) rho2 (rescaled) Correlation (stat/syst/total) Parameters Remarks
ALEPH 40.5+/- 10.0+/- 6.5 1.02+/- 0.98+/- 0.37 0.98/0.99/0.96 input     parameters Phys.Lett.B395:373-,1997
CLEO 44.6+/- 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 42.4+/- 3.7 1.17+/- 0.16 0.93/0.91/0.90 chi2/dof = 0.2/4 (CL = 0.99) eps 1   gif 1   eps 2   gif 2  
nada

|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   mX 
BABAR (m_{ X}) 4.62 +/- 0.38 +/- 0.49   mX 
No combination     eps gif

Last update: 07/15/03 (UL)