Semileptonic Results for the PDG 2006 (Preliminary)

The changes of this update with respect to the status of PDG 2005 are described here.
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Exclusive Branching Fraction: B0 -> Dlnu

This is a one-dimensional fit for the average branching fraction.
Experiment BF (rescaled) [%] Parameters Remarks
ALEPH 2.28 +/- 0.20+/- 0.41 input     parameters Phys.Lett.B395:373-,1997
CLEO 2.11+/- 0.13+/- 0.17 input     parameters Phys.Rev.Lett.82:3746-,1999
BELLE 2.12+/- 0.12+/- 0.39 input     parameters Phys.Lett.B526:258-268,2002
Average 2.12+/- 0.20 chi2/dof = 0.14/2 (CL = 0.93) eps pdf
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Exclusive Branching Fraction: B0 -> D*lnu

This is a one-dimensional fit for the average branching fraction.
Experiment BF (rescaled) [%] Parameters Remarks
ALEPH 5.77 +/- 0.26 +/- 0.36 input     parameters Phys.Lett.B395:373-,1997
OPAL (excl) 5.51 +/- 0.19 +/- 0.39 input     parameters Phys.Lett.B482:15-,2000, exclusive reco.
OPAL (partial reco) 6.20 +/- 0.27 +/- 0.58 input     parameters Phys.Lett.B482:15-,2000, partial reco.
DELPHI (partial reco) 5.04 +/- 0.13 +/- 0.36 input     parameters Phys.Lett.B510:55-,2001, partial reco.
CLEO 6.29 +/- 0.19 +/- 0.39 input     parameters Phys.Rev.Lett.89:081803,2002
BELLE 4.74 +/- 0.23 +/- 0.42 input     parameters Phys.Lett.B526:247-,2002
BABAR 4.89 +/- 0.07 +/- 0.34 input     parameters Phys.Rev.D71:051502,2004
DELPHI (exclu) 5.80 +/- 0.22 +/- 0.46 input     parameters Eur.Phys.J.C33:213,2004
Average 5.35 +/- 0.20 chi2/dof = 14.8/7 (CL = 0.038) eps pdf

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

This is a one-dimensional fit for the average partial branching fraction for a cut on the momentum
of the lepton at p* > 0.6 GeV/c as measured in the Upsilon(4S) frame.  Note for the Belle(Breco)
measurement, the cut was placed in the rest frame of the B-meson - the difference between the partial branching
above 0.6 GeV/c as measured in either the Upsilon(4S) and B-meson rest frames is entirely negligible.

Experiment BF (Rescaled) [%] Input Remarks
p(l) > 0.6 GeV/c
ARGUS (e tag) 9.17 +/- 0.50 +/- 0.33 input     parameters Phys.Lett.B318:397-, 1993
BELLE (l tag) 10.32 +/- 0.11 +/- 0.46 input     parameters Phys.Lett.B547:181-, 2002
BABAR (e tag) 10.37 +/- 0.06 +/- 0.23 input     parameters Phys.Rev.D69:111104, 2004
CLEO (e tag) 10.24 +/- 0.08 +/- 0.22 input     parameters Phys.Rev.D70:032003,2004
BELLE (breco) 10.35 +/- 0.20 +/- 0.37 input     parameters Phys.Lett.B614:27-,2005
Average 10.27 +/- 0.17 chi2/dof = 3.9/4 (CL = 0.42) eps pdf
  
Using the results of a global fit (hep-ph/0507253)
for HQET parameters in the Kinetic Scheme (Eur. Phys. J C 34 (2004) 181)
where none of the measurements listed above have been used as input, one can extract the extrapolation factor necessary to calculate the full branching fraction,  f_c = 1.0495 +/- 0.0005 +/- 0.0010, where the first error is from experiment and theory in the global fit and the second error is assigned as an additional theoretical uncertainty for the ratio Gamma_sl(0.6)/Gamma_sl(0.0) - for Gamma_sl total width this uncertainty is typically 1.5%, on the recommendation of the authors of the fit, for the ratio it is estimated to be 0.1%.
The full branching fraction is extracted as BF( B+/B0 -> X l nu ) = (10.78 +/- 0.18)% .

Inclusive Semileptonic Branching Fraction for B0 -> X-l+nu and B+ -> Xl+nu


Here we list the measurements contributing to the 2005 PDG average (which was not performed by HFAG); as well as the 2005 itself average itself; and the newly published result of Belle. The Belle result makes use of the extrapolation factor (1.0495) explained above. At this time we are unable to provide the average.
Experiment BF(B0 -> X-l+nu)[%] Remarks
CLEO 10.78 +/- 0.60 +/- 0.69 Phys.Lett.B399:321,1997
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ARGUS 9.3 +/- 1.1 +/- 1.5 Phys.Lett.B324:249,1994
CLEO 9.9 +/- 3.0 +/- 0.9 Phys.Rev.D45:2212,1992
PDG 2005 average 10.5 +/- 0.8 Phys. Lett. B 592, 1 (2004) and 2005 partial update
BELLE (breco) 10.32 +/- 0.36 +/- 0.35 Phys.Lett.B614:27-,2005
  

Experiment BF(B+ -> Xl+nu)[%] Remarks
CLEO 10.25 +/- 0.57 +/- 0.65 Phys.Lett.B399:321,1997
PDG 2005 average 10.25 +/- 0.57 +/- 0.65 Phys. Lett. B 592, 1 (2004) and 2005 partial update
BELLE (breco) 11.15 +/- 0.26 +/- 0.41 Phys.Lett.B614:27-,2005
  

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) (rescaled) [10-3] rho2 (rescaled) Correlation (stat/syst/total) Parameters Remarks
ALEPH 33.7 +/- 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) 38.6 +/- 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) 39.3 +/- 1.6 +/- 1.8 1.49 +/- 0.21 +/- 0.26 0.95/0.42/0.61 input     parameters Phys.Lett.B482:15-,2000
DELPHI (partial reco) 37.0 +/- 1.4 +/- 2.5 1.50 +/- 0.14 +/- 0.37 0.94/0.77/0.79 input     parameters Phys.Lett.B510:55-,2001
BELLE 36.0 +/-1.9 +/- 1.8 1.45 +/- 0.16 +/- 0.20 0.91/0.68/0.78 input     parameters Phys.Lett.B526:247-,2002
CLEO 43.8 +/- 1.3 +/- 1.8 1.61 +/- 0.09 +/- 0.21 0.87/0.62/0.67 input     parameters Phys.Rev.Lett.89:081803,2002
BABAR 35.5 +/- 0.3 +/- 1.6 1.29 +/- 0.03 +/- 0.27 0.56/0.73/0.72 input     parameters Phys.Rev.D71:051502,2004
DELPHI (exclu) 38.9 +/- 1.8 +/- 2.1 1.32 +/- 0.15 +/- 0.33 0.89/0.50/0.58 input     parameters Eur.Phys.J.C33:213,2004
Average 37.6 +/- 0.8 1.58 +/- 0.14 0.73/0.58/0.59 chi2/dof = 30.2/14 eps 1  pdf 1  eps 2  pdf 2 
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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|*G(1) and rho2. Note: The fit is two-dimensional, no confidence level is given at the moment.
Experiment |Vcb| G(1) (rescaled) [10-3] rho2 (rescaled) Correlation (stat/syst/total) Parameters Remarks
ALEPH 39.76+/- 10.00+/- 6.43 1.00+/- 0.98+/- 0.37 0.98/0.99/0.96 input     parameters Phys.Lett.B395:373-,1997
CLEO 45.12 +/- 5.80+/- 3.51 1.27+/- 0.25+/- 0.14 0.95/0.98/0.96 input     parameters Phys.Rev.Lett.82:3746-,1999
BELLE 40.99+/- 4.40 +/- 5.10 1.12+/- 0.22+/- 0.14 0.96/0.96/0.92 input     parameters Phys.Lett.B526:258-268,2002
Average 42.6+/- 4.5 1.17+/- 0.18 0.95/0.95/0.93 chi2/dof = 0.3/4 eps 1  pdf 1  eps 2  pdf 2 
Last update: 2006/03/07 Antonio Limosani