Measurement of |Vcb| using B0 to D*l nu decays

TL;DR

This paper measures the CKM matrix element |Vcb| using B0 to D*l nu decays at LEP, combining experimental data with Heavy Quark Effective Theory to determine |Vcb| with quantified uncertainties.

Contribution

It provides a new measurement of |Vcb| from B0 decays using OPAL data and incorporates theoretical calculations for improved accuracy.

Findings

Measured F(1)|Vcb| = (37.1±1.0±2.0)×10^-3

Derived |Vcb| = (40.7±1.1±2.2±1.6)×10^-3 using HQET

Measured branching ratio Br(B0→D* l nu) = (5.26±0.20±0.46)%

Abstract

The magnitude of the Cabibbo-Kobayashi-Maskawa matrix element Vcb has been measured using B0 to D*l nu decays recorded on the Z0 peak using the OPAL detector at LEP. The D* to D0 pi+ decays were reconstructed both in the particular decay modes D0 to K- pi+ and D0 to K- pi+ pi- and via an inclusive technique. The product of |Vcb| and the decay form factor of the B0 to D* l nu transition at zero recoil F(1) was measured to be F(1)|Vcb| = (37.1+-1.0+-2.0)x10^-3, where the uncertainties are statistical and systematic respectively. By using Heavy Quark Effective Theory calculations for F(1), a value of |Vcb| = (40.7+-1.1+-2.2+-1.6)x 10^-3 was obtained, where the third error is due to theoretical uncertainties in the value of F(1). The branching ratio Br(B0 to D* l nu) was also measured to be (5.26+-0.20+-0.46)%.