From approximately 3 million hadronic decays of Z bosons recorded with the ALEPH detector at LEP, a sample of 410 +/- 32 over bar B(0) -> D*(+)l(-)nu(l) candidates is selected, where l is either an electron or a muon. The differential decay rate dGamma(over bar B(0) -> D*(+)l(-)nu(l))/(domega) from this sample is fitted, yielding a value for the product of the CKM matrix element |Vcb| and the normalisation of the decay form factor at the point of zero recoil of the D*(+) meson F(omega = 1)|Vcb| = (31.4 +/- 2.3(stat) +/- 2.5(syst)) x 10(-3). A value for |Vcb| is extracted using theoretical calculations of the form factor normalisation, with the result |Vcb| = (34.5 +/- 2.5(stat) +/- 2.7(syst) +/- 1.5(theory)) x 10(-3) From the integrated spectrum, the measured branching fraction is Br(over bar B(0) -> D*(+)l(-)nu) = (5.18 +/- 0.30(stat) +/- 0.62(syst))%.

D., B., D., C., I., D., D., D., P., G., C., G., et al. (1995). A Measurement of the |Vcb| from over bar B(0) -> D*+ lepton- (nu bar)_l. PHYSICS LETTERS. SECTION B, 359(1-2), 236-248 [10.1016/0370-2693(95)01021-H].

A Measurement of the |Vcb| from over bar B(0) -> D*+ lepton- (nu bar)_l

CIOCCI, MARIA AGNESE;MARROCCHESI, PIER SIMONE;
1995-01-01

Abstract

From approximately 3 million hadronic decays of Z bosons recorded with the ALEPH detector at LEP, a sample of 410 +/- 32 over bar B(0) -> D*(+)l(-)nu(l) candidates is selected, where l is either an electron or a muon. The differential decay rate dGamma(over bar B(0) -> D*(+)l(-)nu(l))/(domega) from this sample is fitted, yielding a value for the product of the CKM matrix element |Vcb| and the normalisation of the decay form factor at the point of zero recoil of the D*(+) meson F(omega = 1)|Vcb| = (31.4 +/- 2.3(stat) +/- 2.5(syst)) x 10(-3). A value for |Vcb| is extracted using theoretical calculations of the form factor normalisation, with the result |Vcb| = (34.5 +/- 2.5(stat) +/- 2.7(syst) +/- 1.5(theory)) x 10(-3) From the integrated spectrum, the measured branching fraction is Br(over bar B(0) -> D*(+)l(-)nu) = (5.18 +/- 0.30(stat) +/- 0.62(syst))%.
1995
D., B., D., C., I., D., D., D., P., G., C., G., et al. (1995). A Measurement of the |Vcb| from over bar B(0) -> D*+ lepton- (nu bar)_l. PHYSICS LETTERS. SECTION B, 359(1-2), 236-248 [10.1016/0370-2693(95)01021-H].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/37514
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