Global Fit in the Kinetic Scheme

Fit Results

Constraint |Vcb| (10-3) mbkin (GeV) mu2pi (GeV2)
Xsgamma 41.94 +/- 0.43(fit) +/- 0.59(th) 4.574 +/- 0.032 0.459 +/- 0.037 details
mc(3 GeV) 41.88 +/- 0.44(fit) +/- 0.59(th) 4.560 +/- 0.023 0.453 +/- 0.036 details

Figures of the Delta chi2=1 ellipses can be found here:

• in the mb vs. |Vcb| plane: eps, pdf
• in the mb vs. mu2pi plane: eps, pdf

Fit input

Note: The photon energy moments listed are only use in the global fit with Xsgamma constraint.

Table 1. The list of the moment measurements that form the basis for the combined fit. The symbol 'n' indicates the order of the moment while 'c' indicates the value of the minimum lepton or photon energy (in GeV) with which the moments are measured.
Experiment Hadron moments <MnX> Lepton moments <Enl> Photon moments <Engamma> References
BaBar n=2 c=0.9,1.1,1.3,1.5
n=4 c=0.8,1.0,1.2,1.4
n=6 c=0.9,1.3 [1]
n=0 c=0.6,1.2,1.5
n=1 c=0.6,0.8,1.0,1.2,1.5
n=2 c=0.6,1.0,1.5
n=3 c=0.8,1.2 [1,2]
n=1 c=1.9,2.0
n=2 c=1.9 [3,4]
[1] Phys.Rev. D81 (2010) 032003
[2] Phys.Rev. D69 (2004) 111104
[3] Phys.Rev. D72 (2005) 052004
[4] Phys. Rev. Lett. 97, 171803 (2006)
Belle n=2 c=0.7,1.1,1.3,1.5
n=4 c=0.7,0.9,1.3 [5]
n=0 c=0.6,1.0,1.4
n=1 c=0.6,0.8,1.0,1.2,1.4
n=2 c=0.6,1.0,1.4
n=3 c=0.8,1.0, 1.2 [6]
n=1 c=1.8,1.9
n=2 c=1.8,2.0 [7]
[5] Phys.Rev. D75 (2007) 032005
[6] Phys.Rev. D75 (2007) 032001
[7] Phys.Rev.Lett. 103 (2009) 241801
CDF n=2 c=0.7
n=4 c=0.7 [8]
. . [8] Phys.Rev. D71 (2005) 051103
CLEO n=2 c=1.0,1.5
n=4 c=1.0,1.5 [9]
. n=1 c=2.0 [10] [9] Phys.Rev. D70 (2004) 032002
[10] Phys.Rev.Lett. 87 (2001) 251807
DELPHI n=2 c=0.0
n=4 c=0.0 [11]
n=1 c=0.0
n=2 c=0.0
n=3 c=0.0 [11]
. [11] Eur.Phys.J. C45 (2006) 35-59

The only external input used is the average B lifetime taken to be (1.582 +/- 0.007) ps.

last update: Feb 22, 2012 by C.Schwanda