We present a measurement of the Cabibbo-Kobayashi-Maskawa matrix element |V<inf>cb</inf>| based on a sample of about 53 700 B̄<sup>0</sup> → D*<sup>+</sup>ℓ<sup>-</sup>ν̄<inf>ℓ</inf> decays observed by the BABAR detector. We obtain the branching fraction averaged over ℓ = e, μ, B(B̄<sup>0</sup> → D*<sup>+</sup>ℓ <sup>-</sup>ν̄<inf>ℓ</inf>) = (4.90 ± 0.07(stat.) <inf>-0.35</inf><sup>+0.36</sup>(syst.))%. We measure the differential decay rate as a function of w, the relativistic boost γ of the D*<sup>+</sup> in the B̄<sup>0</sup> rest frame. By extrapolating dΓ/dw to the kinematic limit w → 1, we extract the product of |V <inf>cb</inf>| and the axial form factor A<inf>1</inf>(w = 1). We combine this measurement with a lattice QCD calculation of A<inf>1</inf>(w = 1) to determine |V<inf>cb</inf>) = (38.7 ± 0.3(stat.) ± 1.7(syst.) <inf>-1.3</inf><sup>+1.5</sup>(theory)) × 10<sup>-3</sup>. © 2005 The American Physical Society.

Aubert, B., Barate, R., Boutigny, D., Couderc, F., Gaillard, J., Hicheur, A., et al. (2005). Measurement of the B̄<sup>0</sup> → D *<sup>+</sup>ℓ<sup>-</sup>ν̄<inf>ℓ</inf> decay rate and |V<inf>cb</inf>|. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 71(5), 1-8 [10.1103/PhysRevD.71.051502].

Measurement of the B̄0 → D *+-ν̄ decay rate and |Vcb|

PATRIGNANI, CLAUDIA;
2005

Abstract

We present a measurement of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| based on a sample of about 53 700 B̄0 → D*+-ν̄ decays observed by the BABAR detector. We obtain the branching fraction averaged over ℓ = e, μ, B(B̄0 → D*+-ν̄) = (4.90 ± 0.07(stat.) -0.35+0.36(syst.))%. We measure the differential decay rate as a function of w, the relativistic boost γ of the D*+ in the B̄0 rest frame. By extrapolating dΓ/dw to the kinematic limit w → 1, we extract the product of |V cb| and the axial form factor A1(w = 1). We combine this measurement with a lattice QCD calculation of A1(w = 1) to determine |Vcb) = (38.7 ± 0.3(stat.) ± 1.7(syst.) -1.3+1.5(theory)) × 10-3. © 2005 The American Physical Society.
2005
Aubert, B., Barate, R., Boutigny, D., Couderc, F., Gaillard, J., Hicheur, A., et al. (2005). Measurement of the B̄<sup>0</sup> → D *<sup>+</sup>ℓ<sup>-</sup>ν̄<inf>ℓ</inf> decay rate and |V<inf>cb</inf>|. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 71(5), 1-8 [10.1103/PhysRevD.71.051502].
Aubert, B; Barate, R.; Boutigny, D.; Couderc, F.; Gaillard, J.-M.; Hicheur, A.; Karyotakis, Y.; Lees, J.P.; Tisserand, V.; Zghiche, A.; Palano, A.; Po...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/551965
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