| CONF-03/016 Measurement of |V_cb| from B0 -> D* l nu_l Decays |
| Doc Type |
Conference Submissions |
| Record Created |
July 14, 2003 |
| SLAC-PUB |
| Preprint # |
hep-ex/0308027 |
| Completed Date |
August 9, 2003 |
| Abstract |
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A preliminary measurement of |Vcb| and the branching fraction BR(B0 -> D* l nu_l)
has been performed based on a sample of about 55,700 B0 -> D* l nu_l decays
recorded with the BaBar detector.
The decays are identified in the D* -> D0 pi final state, with the D0 reconstructed
in three different decay modes. The differential decay rate is measured as a function
of the relativistic boost of the D* in the B0 rest frame.
The value of the differential decay rate at `zero recoil', namely the point at which
the D* is at rest in the B0 frame, is predicted in Heavy Quark Effective Theory as a
kinematic factor times F(1)|Vcb|, where F(1) is the unique form factor governing the
decay. We extrapolate the measured differential decay rate to the zero recoil point
and obtain F(1)|Vcb|=(34.03+-0.24+-1.31) x 10^-3. Using a theoretical calculation for
F(1) we extract
|Vcb| = (37.27+-0.26(stat.)+-1.43(syst.)+1.5-1.2(theo.) x 10^-3.
From the integrated decay rate we obtain
BR(B0 -> D* l nu_l) = (4.68+-0.03+-0.29)%.
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| Revisions and Files |
1 revised July 14, 2003
File Date
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| 09-AUG-2003 |
abstract.txt |
Abstract |
txt |
1.00 |
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| 09-AUG-2003 |
babar-conf-0316.pdf |
Paper (journal paper or conference submission by BABAR Collaboration) |
pdf |
427.14 |
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| 09-AUG-2003 |
babar-conf-0316.ps |
Paper (journal paper or conference submission by BABAR Collaboration) |
ps |
595.04 |
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| 09-AUG-2003 |
fig01a.eps |
Figure or plot |
eps |
24.07 |
DeltaM distribution for on-resonant data, electron channel |
| 09-AUG-2003 |
fig01b.eps |
Figure or plot |
eps |
25.14 |
DeltaM distribution for on-resonant data, muon channel |
| 09-AUG-2003 |
fig02a.eps |
Figure or plot |
eps |
588.23 |
Experimental cosBY distribution for B0 -> D* e nu_e, D0 -> K pi |
| 09-AUG-2003 |
fig02b.eps |
Figure or plot |
eps |
591.26 |
Experimental cosBY distribution for B0 -> D* mu nu_mu, D0 -> K pi pi0 |
| 09-AUG-2003 |
fig03a.eps |
Figure or plot |
eps |
35.98 |
Experimental w distribution for electrons, for all D0 modes |
| 09-AUG-2003 |
fig03b.eps |
Figure or plot |
eps |
34.97 |
Experimental w distribution for muons, for all D0 modes |
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| Submitted To | 2003 International Symposium on Lepton and Photon Interactions at High Energies |
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| Categories |
- AWG: Exclusive Semileptonic B Decays
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