Measurement of the B0bar --> D*+ l- nubar_l Decay Rate and |Vcb|
| dc.creator | Aubert, B. | |
| dc.creator | Collaboration, BABAR | |
| dc.date | 2004-08-10 | |
| dc.date.accessioned | 2026-07-07T11:57:54Z | |
| dc.date.available | 2026-07-07T11:57:54Z | |
| dc.description | We present a measurement of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| based on a sample of about 53,700 B0bar --> D*+ l- nubar_l decays observed by the BaBar detector. We obtain the branching fraction averaged over l = e, mu, BR(B0bar --> D*+ l- nubar_l) = (4.90 +- 0.07(stat.) +0.36-0.35(syst.))%. We measure the differential decay rate as a function of w, the relativistic boost gamma of the D*+ in the B0bar rest frame. By extrapolating dGamma/dw to the kinematic limit w --> 1, we extract the product of |Vcb| and the axial form factor A_1(w=1). We combine this measurement with a lattice QCD calculation of A_1(w=1) to determine |Vcb| = (38.7 +- 0.3(stat.) +- 1.7(syst.) +1.5-1.3(theory)) * 10^-3. | |
| dc.description | 8 pages, 4 postscript figures, contributed to ICHEP'04, 32nd International Conference on High Energy Physics, 8/16 - 8/22/2004, Beijing, China. Submitted to Phys. Rev. D (Rapid Communications) | |
| dc.identifier | https://arxiv.org/abs/hep-ex/0408027 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/0408027 | |
| dc.identifier | Phys.Rev.D71:051502,2005 | |
| dc.identifier | doi:10.1103/PhysRevD.71.051502 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/206044 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Measurement of the B0bar --> D*+ l- nubar_l Decay Rate and |Vcb| | |
| dc.type | text |