Semileptonic Results for Winter 2003

The changes of this update with respect to the status of summer 2002 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

The following table contains the branching fractions where the Belle and BABAR measurements have been scaled to the rescaled PDG2002 average of f+/f0.
Experiment BF (rescaled) Parameters Remarks
ALEPH 5.73 +/- 0.26 +/- 0.37 input     parameters Phys.Lett.B395:373-,1997
OPAL (Excl) 5.39 +/- 0.19 +/- 0.41 input     parameters Phys.Lett.B482:15-,2000, partial reco.
OPAL (Incl) 6.07 +/- 0.27 +/- 0.59 input     parameters Phys.Lett.B482:15-,2000, exclusive reco.
DELPHI (Incl) 4.90 +/- 0.13 +/- 0.35 input     parameters Phys.Lett.B510:55-,2001, partial reco.
BELLE 4.82 +/- 0.23 +/- 0.42 input     parameters Phys.Lett.B526:247-,2002
CLEO 6.24 +/- 0.19 +/- 0.39 input     parameters Phys.Rev.Lett.89:081803,2002
DELPHI (Excl) 5.68 +/- 0.20 +/- 0.41 input     parameters preliminary, exclusive reco.
BABAR 4.92 +/- 0.03 +/- 0.29 input     parameters preliminary
Average 5.27 +/- 0.19 (CL = 0.064) eps gif
nada

Inclusive Semileptonic Branching Fraction: B -> Xlnu

Experiment Rescaled Value Input Remarks
ARGUS 09.70 +/- 0.50 +/- 0.40 input     parameters Phys. Lett. B318:397, 1993, e-tag
CLEO 10.49 +/- 0.17 +/- 0.43 input     parameters Phys. Rev. Lett. 76:1570, 1996, e-tag
BELLE 10.90 +/- 0.12 +/- 0.50 input     parameters Phys.Lett.B547:181, 2002, e-tag
BABAR (breco) 10.40 +/- 0.50 +/- 0.46 input     parameters preliminary, hep-ex/0204001, breco
BABAR 10.87 +/- 0.18 +/- 0.30 input     parameters submitted to Phys. Rev. D, e-tag
BELLE (breco) 11.19 +/- 0.20 +/- 0.31 input     parameters breco-tag, preliminary
Average 10.81 +/- 0.25 (CL = 0.331) eps gif

Exclusive |Vcb| F(1)

Experiment |Vcb| F(1) (rescaled) rho2 (rescaled) Parameters Remarks
ALEPH 33.5 +/- 2.1 +/- 1.6 0.75 +/- 0.25 +/- 0.37 input     parameters Phys.Lett.B395:373-,1997
OPAL 38.3 +/- 1.2 +/- 2.5 1.23 +/- 0.14 +/- 0.39 input     parameters Phys.Lett.B482:15-,2000 (partial reco)
OPAL 38.9 +/- 1.6 +/- 1.8 1.46 +/- 0.21 +/- 0.26 input     parameters Phys.Lett.B482:15-,2000 (excl)
DELPHI 36.5 +/- 1.4 +/- 2.5 1.47 +/- 0.14 +/- 0.37 input     parameters Phys.Lett.B510:55-,2001
BELLE 36.0 +/-1.9 +/-1.9 1.45 +/- 0.16 +/- 0.20 input     parameters Phys.Lett.B526:247-,2002
CLEO 43.6 +/- 1.3 +/- 1.8 1.61 +/- 0.09 +/- 0.21 input     parameters Phys.Rev.Lett.89:081803,2002
DELPHI 38.5 +/- 1.8 +/- 2.0 1.32 +/- 0.15 +/- 0.32 input     parameters preliminary
average 38.1 +/- 1.0 1.57 +/- 0.14 chi2/dof = 26.2/14 (CL = 0.024) |Vcb| F(1): plot; correlation: plot
While the individual measurements have been rescaled slightly due to minor adjustements in the common input parameters, the average does not change with respect to summer 2002.

With F(1) = 0.91 +/- 0.04, this yields |Vcb| = (41.9 +/-1.1exp +/- 1.8theo)10-3 nada

Exclusive |Vcb*G(1)|

Experiment |Vcb| G(1) (rescaled) rho2 (rescaled) Parameters Remarks
ALEPH 39.3+/- 10.0+/- 6.4 0.98+/- 0.98+/- 0.37 input     parameters Phys.Lett.B395:373-,1997
CLEO 44.8+/- 5.8+/- 3.5 1.27+/- 0.25+/- 0.14 input     parameters Phys.Rev.Lett.82:3746-,1999
BELLE 41.2+/- 4.4 +/- 5.1 1.12+/- 0.22+/- 0.14 input     parameters Phys.Lett.B526:258-268,2002
average 41.9+/- 3.7 1.15+/- 0.16 chi2/dof = 0.01/6 (CL = 1.00) plot
While the individual measurements have been rescaled slightly due to minor adjustements in the common input parameters, the average does not change with respect to summer 2002.

With G(1)=1.0+/-0.07 (PDG), this gives |Vcb| = (41.9 +/-3.7exp +/-2.9theo) 10-3 nada

|Vcb| from Inclusive Semileptonic Decays B -> Xlnu

This relies on the published measurements of the photon spectrum and hadronic mass moments (both by CLEO):

Vcb = 40.7 (1 +/-0.010exp +/-0.012lambda_1, Lambda_bar +/-0.0201/m**3,QCD scale ) 10-3

where we use |Vcb| = |Vcb|CLEO SQRT(GammaSL/GammaSL, CLEO), GammaSL, CLEO=0.427. nada

|Vub| in inclusive semileptonic B decays

Experiment Rescaled Value Parameters Remarks
ALEPH 4.12 +/- 1.00   neural net
L3 5.70 +/- 1.70   cut and count
DELPHI 4.07 +/- 0.92   mX
OPAL 4.00 +/- 1.03   neural net
LEP Average 4.09 +/- 0.70    
CLEO (endpoint) 4.08 +/- 0.65   2.2 < p < 2.6
BABAR (endpoint) 4.43 +/- 0.72   2.3 < p < 2.6  
CLEO (m_{ X} - Q^{2}) 4.05 +/- 0.89   mX - Q2
BABAR (m_{ X}) 4.52 +/- 0.61   mX 
BELLE (m_{ X} with D^{*}l#nu tag) 5.00 +/- 0.83   mX with D*lnu tag  
BELLE (m_{ X} - Q^{2}) 3.96 +/- 0.70   mX 
No combination     eps gif

Last update: 03/07/03 (UL)