Updates of Semileptonic Results for PDG 2007

The changes of this update with respect to the status of PDG 2006 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 2.14 +/- 0.18+/- 0.37 input     parameters Phys.Lett.B395:373-387,1997 [Spires]
CLEO 2.07+/- 0.13+/- 0.16 input     parameters Phys.Rev.Lett.82:3746,1999 [hep-ex/9811042]
BELLE 2.12+/- 0.12+/- 0.39 input     parameters Phys.Lett.B526:258-268,2002 [hep-ex/0111082]
Average 2.08+/- 0.18 chi2/dof = 0.03/2 (CL = 0.98) eps pdf gif
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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 (excl) 5.70 +/- 0.27 +/- 0.35 input     parameters Phys.Lett.B395:373-387,1997 [Spires]
OPAL (excl) 5.35 +/- 0.20 +/- 0.37 input     parameters Exclusive reco, Phys.Lett.B482:15-30,2000 [hep-ex/0003013]
OPAL (partial reco) 6.15 +/- 0.28 +/- 0.58 input     parameters Partial reco, Phys.Lett.B482:15-30,2000 [hep-ex/0003013]
DELPHI (partial reco) 4.98 +/- 0.14 +/- 0.36 input     parameters Partial reco, Phys.Lett.B510:55-74,2001 [hep-ex/0104026]
BELLE (excl) 4.73 +/- 0.24 +/- 0.41 input     parameters Phys.Lett.B526:247-257,2002 [hep-ex/0111060]
CLEO (excl) 6.24 +/- 0.19 +/- 0.38 input     parameters Phys.Rev.Lett.89:081803,2002[hep-ex/0203032]
DELPHI (excl) 5.56 +/- 0.20 +/- 0.44 input     parameters Eur.Phys.J.C33:213,2004 [hep-ex/0401023]
BABAR (excl) 4.82 +/- 0.07 +/- 0.33 input     parameters Phys.Rev.D71:051502,2004 [hep-ex/0408027]
Average 5.29 +/- 0.19 chi2/dof = 14/7 (CL = 0.05) eps pdf gif

Exclusive |Vcb| F(1)

All the measurements in the following average had been recalibrated such that R_1=(1.396+/-0.060+/-0.035+/-0.027) and R_2=(0.885+/-0.040+/-0.022+/-0.013) is assumed, as measured by the BABAR collaboration Phys.Rev. D74 (2006) 092004 [hep-ex/0602023]

This table and the plots in the last row document the two-dimensional simultaneous fit to |Vcb|*F(1) and rho2.
Experiment |Vcb| F(1) (rescaled) [10-3] rho2 (rescaled) Correlation (stat/syst/total) Parameters Remarks
ALEPH (excl) 32.5 +/- 1.7 +/- 1.3 0.49 +/- 0.25 +/- 0.12 0.94/0.60/0.72 input     parameters Phys.Lett.B395:373-387,1997 [Spires]
OPAL (excl) 37.5 +/- 1.6 +/- 1.5 1.21 +/- 0.21 +/- 0.15 0.95/0.42/0.61 input     parameters Phys.Lett.B482:15-30,2000 [hep-ex/0003013]
OPAL (partial reco) 37.7 +/- 1.2 +/- 2.3 1.09 +/- 0.14 +/- 0.30 0.77/0.70/0.71 input     parameters Phys.Lett.B482:15-30,2000 [hep-ex/0003013]
DELPHI (partial reco) 36.0 +/- 1.4 +/- 2.3 1.30 +/- 0.14 +/- 0.27 0.94/0.77/0.79 input     parameters Phys.Lett.B510:55-74,2001 [hep-ex/0104026
BELLE (excl) 34.9 +/- 1.8 +/- 1.7 1.25 +/- 0.16 +/- 0.11 0.91/0.68/0.78 input     parameters Phys.Lett.B526:247-257-,2002 [hep-ex/0111060]
CLEO (excl) 42.4 +/- 1.3 +/- 1.6 1.41 +/- 0.09 +/- 0.09 0.87/0.62/0.67 input     parameters Phys.Rev.Lett.89:081803,2002 [hep-ex/0203032]
DELPHI (excl) 37.2 +/- 1.7 +/- 1.9 1.06 +/- 0.15 +/- 0.16 0.89/0.50/0.58 input     parameters Eur.Phys.J.C33:213,2004 [hep-ex/0401023]
BABAR 34.3 +/- 0.3 +/- 1.2 1.10 +/- 0.03 +/- 0.09 0.56/0.73/0.72 input     parameters Phys.Rev.D71:051502,2004 [hep-ex/0408027]
Average 35.7 +/- 0.6 1.13 +/- 0.07 0.73/0.52/0.55 chi2/dof = 33.6/14 (CL = 0.0024) eps 1  pdf 1  gif 1  eps 2  pdf 2  gif 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 38.7+/- 11.8+/- 6.2 0.95+/- 0.98+/- 0.36 0.98/0.99/0.96 input     parameters Phys.Lett.B395:373-387,1997 [Spires]
CLEO 44.8 +/- 5.9+/- 3.4 1.27+/- 0.25+/- 0.14 0.95/0.98/0.96 input     parameters Phys.Rev.Lett.82:3746,1999 [hep-ex/9811042]
BELLE 41.0+/- 4.4 +/- 5.1 1.12+/- 0.22+/- 0.14 0.96/0.96/0.92 input     parameters Phys.Lett.B526:258-268,2002 [hep-ex/0111082]
Average 42.3+/- 4.5 1.17+/- 0.18 0.95/0.94/0.93 chi2/dof = 0.3/4 (CL = 0.99) eps 1  pdf 1  gif 1  eps 2  pdf 2  gif 2 

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.B318:397-404, 1993 [Spires]
BELLE (l tag) 10.32 +/- 0.11 +/- 0.46 input     parameters Phys.Lett.B547:181-192, 2002 [hep-ex/0208033]
CLEO (e tag) 10.23 +/- 0.08 +/- 0.22 input     parameters Phys.Rev.D70:032003,2004 [hep-ex/0403053]
BABAR (e tag) 10.37 +/- 0.06 +/- 0.23 input     parameters Phys.Rev.D69:111104, 2004 [hep-ex/0403030]
BABAR (B_{reco} tag) 10.03 +/- 0.19 +/- 0.33 input     parameters Phys.Rev.D74:091105,2006 [hep-ex/0607111]
BELLE (B_{reco} tag) 10.28 +/- 0.18 +/- 0.24 input     parameters Phys.Rev.D75:032001,2007 [hep-ex/0610012]
Average 10.24 +/- 0.15 chi2/dof = 4/5 (CL = 0.52) eps pdf gif
  
Using the results of a global fit (Phys.Rev.D73,073008(2006))
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 ) = (10.75 +/- 0.16)% .

Inclusive Semileptonic Branching Fraction for B+ -> Xl+nu

  
Experiment BF (Rescaled) [%] Input Remarks
CLEO (l tag) 10.25 +/- 0.57 +/- 0.66 input     parameters Phys.Lett.B399:321,1997 [hep-ex/9702007]
BABAR (B_{reco} tag) 10.90 +/- 0.27 +/- 0.39 input     parameters Phys.Rev.D74:091105,2006 [hep-ex/0607111]
BELLE (B_{reco} tag) 11.17 +/- 0.25 +/- 0.28 input     parameters Phys.Rev.D75:032001,2007 [hep-ex/0610012]
Average 10.99 +/- 0.28 chi2/dof = 1/2 (CL = 0.61) eps pdf gif
  

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

  
Experiment BF(B+->) (Rescaled) [%] Input Remarks
CLEO (partial tag) 9.9 +/- 3.0 +/- 0.9 input     parameters Phys.Rev.D45:2212-2231,1992 [Spires]
ARGUS (partial tag) 9.3 +/- 1.1 +/- 1.5 input     parameters Phys.Lett.B324:249-254,1994 [Spires]
CLEO (partial tag) 10.78 +/- 0.60 +/- 0.69 input     parameters Phys.Lett.B399:321-328,1997 [hep-ex/9702007]
BABAR (B_{reco} tag) 10.14 +/- 0.28 +/- 0.33 input     parameters Phys.Rev.D74:091105,2006 [hep-ex/0607111]
BELLE (B_{reco} tag) 10.46 +/- 0.30 +/- 0.23 input     parameters Phys.Rev.D75:032001,2007 [hep-ex/0610012]
Average 10.33 +/- 0.28 chi2/dof = 0.9/4 (CL = 0.92) eps pdf gif
  

Ratio of Semileptonic Branching Fractions for B+ to B0 -> X-l+nu

The total width of semileptonic B meson decays is expected to be the same for both neutral and charged mesons. Therefore the ratio of the branching fractions R+0 should be equivalent to the ratio of the B-meson lifetime Tau_B+/Tau_B0. Recently both Babar and Belle reported precise measurements of R_+0 for which we provide an average.   
Experiment R+/0(Rescaled) [%] Input Remarks
BABAR 1.084 +/- 0.041 +/- 0.025 input     Phys.Rev.D74:091105,2006 [hep-ex/0607111]
BELLE 1.069 +/- 0.040 +/- 0.026 input     Phys.Rev.D75:032001,2007 [hep-ex/0610012]
Average 1.076 +/- 0.034 chi2/dof = 0.05/1 (CL = 0.82) eps pdf gif
  
B+ -> pi0 l+ nu average for ICHEP 2006

Branching fractions of B+ -> pi0 l+ nu

Experiment / Mode BF [10-4] BF(q2<16 GeV2) [10-4] BF(q2>16 GeV2) [10-4] Reference
BABAR SL tag: B ^{+} \rightarrow \pi^{0} l^{+} \nu 0.73 +/- 0.18 +/- 0.08 0.63 +/- 0.16 +/- 0.06 0.10 +/- 0.12 +/- 0.04 SL tag, Phys.Rev.Lett.97:211801,2006 [hep-ex/0607089] (input)
BABAR B_{reco} tag: B ^{+} \rightarrow \pi^{0} l^{+} \nu 0.82 +/- 0.22 +/- 0.11 0.56 +/- 0.19 +/- 0.08 0.26 +/- 0.12 +/- 0.06 Breco tag, Phys.Rev.Lett.97:211801,2006 [hep-ex/0607089] (input)
BELLE SL tag: B ^{+} \rightarrow \pi^{0} l^{+} \nu 0.77 +/- 0.14 +/- 0.08 0.57 +/- 0.12 +/- 0.06 0.20 +/- 0.08 +/- 0.02 Accepted by PLB, SL tag hep-ex/0604024] (input)
Average: B ^{+} \rightarrow \pi^{0} l^{+} \nu 0.77 +/- 0.10 +/- 0.07 0.58 +/- 0.09 +/- 0.05 0.18 +/- 0.09 +/- 0.04 Plots: eps pdf gif   chi2/dof = 0.07/2 (CL = 0.96)

B -> pi l nu average for ICHEP 2006

Branching fractions of B -> pi l nu

The measurements quoted here include both B0 and B+ decays; the average assumes equality of the semileptonic decays widths for these isospin-conjugate states, and is quoted for B0 decays.

Experiment / Mode BF [10-4] BF(q2<16 GeV2) [10-4] BF(q2>16 GeV2) [10-4] Reference
BABAR SL tag: B ^{0} \rightarrow \pi^{-} l^{+} \nu 1.12 +/- 0.25 +/- 0.10 0.83 +/- 0.22 +/- 0.08 0.29 +/- 0.15 +/- 0.04 SL tag, Phys.Rev.Lett.97:211801,2006 [hep-ex/0607089] (input)
BELLE SL tag: B ^{0} \rightarrow \pi^{-} l^{+} \nu 1.38 +/- 0.19 +/- 0.15 1.02 +/- 0.16 +/- 0.11 0.36 +/- 0.10 +/- 0.04 Accepted by PLB, SL tag (hep-ex/0604024) (input)
BABAR B_{reco} tag: B ^{0} \rightarrow \pi^{-} l^{+} \nu 1.07 +/- 0.27 +/- 0.15 0.42 +/- 0.18 +/- 0.05 0.65 +/- 0.20 +/- 0.13 Breco tag, Phys.Rev.Lett.97:211801,2006 [hep-ex/0607089] (input)
CLEO untagged: B^{0} \rightarrow \pi^{-} l^{+} \nu 1.33 +/- 0.18 +/- 0.11 1.08 +/- 0.16 +/- 0.10 0.25 +/- 0.09 +/- 0.05 Untagged, Phys. Rev. D 68, 072003 (2003) (hep-ex/0304019) (input)
BABAR untagged: B^{0} \rightarrow \pi^{-} l^{+} \nu 1.46 +/- 0.07 +/- 0.08 1.09 +/- 0.06 +/- 0.07 0.38 +/- 0.04 +/- 0.03 Untagged loose neutrino, Phys. Rev. Lett. 98, 091801 (2007) [hep-ex/0612020 ] (input)
Average: B ^{0} \rightarrow \pi^{-} l^{+} \nu 1.36 +/- 0.06 +/- 0.07 0.95 +/- 0.05 +/- 0.05 0.35 +/- 0.04 +/- 0.03 Plots: eps pdf gif   chi2/dof = 2/4 (CL = 0.68)

B -> pi l nu average for ICHEP 2006

Branching fractions of B -> pi l nu

The measurements quoted here include both B0 and B+ decays; the average assumes equality of the semileptonic decays widths for these isospin-conjugate states, and is quoted for B0 decays.

Experiment / Mode BF [10-4] BF(q2<16 GeV2) [10-4] BF(q2>16 GeV2) [10-4] Reference
BABAR SL tag: B ^{+} \rightarrow \pi^{0} l^{+} \nu \times 2\tau_{0}/\tau_{+} 1.36 +/- 0.34 +/- 0.15 1.18 +/- 0.30 +/- 0.11 0.19 +/- 0.22 +/- 0.07 SL tag, Phys.Rev.Lett.97:211801,2006 [hep-ex/0607089] (input)
BABAR B_{reco} tag: B ^{+} \rightarrow \pi^{0} l^{+} \nu \times 2\tau_{0}/\tau_{+} 1.53 +/- 0.41 +/- 0.21 1.05 +/- 0.35 +/- 0.15 0.49 +/- 0.22 +/- 0.11 Breco tag, Phys.Rev.Lett.97:211801,2006 [hep-ex/0607089] (input)
BELLE SL tag: B ^{+} \rightarrow \pi^{0} l^{+} \nu \times 2\tau_{0}/\tau_{+} 1.44 +/- 0.26 +/- 0.15 1.06 +/- 0.22 +/- 0.11 0.37 +/- 0.15 +/- 0.04 Accepted by PLB, SL tag hep-ex/0604024] (input)
BABAR SL tag: B ^{0} \rightarrow \pi^{-} l^{+} \nu 1.12 +/- 0.25 +/- 0.10 0.83 +/- 0.22 +/- 0.08 0.29 +/- 0.15 +/- 0.04 SL tag, Phys.Rev.Lett.97:211801,2006 [hep-ex/0607089] (input)
BELLE SL tag: B ^{0} \rightarrow \pi^{-} l^{+} \nu 1.38 +/- 0.19 +/- 0.15 1.02 +/- 0.16 +/- 0.11 0.36 +/- 0.10 +/- 0.04 Accepted by PLB, SL tag (hep-ex/0604024) (input)
BABAR B_{reco} tag: B ^{0} \rightarrow \pi^{-} l^{+} \nu 1.07 +/- 0.27 +/- 0.15 0.42 +/- 0.18 +/- 0.05 0.65 +/- 0.20 +/- 0.13 Breco tag, Phys.Rev.Lett.97:211801,2006 [hep-ex/0607089] (input)
CLEO untagged: B^{0} \rightarrow \pi^{-} l^{+} \nu 1.33 +/- 0.18 +/- 0.11 1.08 +/- 0.16 +/- 0.10 0.25 +/- 0.09 +/- 0.05 Untagged, Phys. Rev. D 68, 072003 (2003) (hep-ex/0304019) (input)
BABAR untagged: B^{0} \rightarrow \pi^{-} l^{+} \nu 1.46 +/- 0.07 +/- 0.08 1.09 +/- 0.06 +/- 0.07 0.38 +/- 0.04 +/- 0.03 Untagged loose neutrino, Phys. Rev. Lett. 98, 091801 (2007) [hep-ex/0612020 ] (input)
Average: B ^{0} \rightarrow \pi^{-} l^{+} \nu 1.37 +/- 0.06 +/- 0.07 0.97 +/- 0.05 +/- 0.05 0.35 +/- 0.03 +/- 0.03 Plots: eps pdf gif   chi2/dof = 2/7 (CL = 0.92)

Last update: 2007/31/06 Francesca Di Lodovico (Bug fix).