Determination of ${\rm |V_{ub}|}$ from the measurement of the inclusive charmless semileptonic branching ratio of b hadrons | Zendy

R. Barate et al. | Zendy

Open Access

Determination of ${\rm |V_{ub}|}$ from the measurement of the inclusive charmless semileptonic branching ratio of b hadrons

Author(s) -

R. Barate et al.

Publication year - 1999

Publication title -

the european physical journal c

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.938

H-Index - 198

eISSN - 1434-6052

pISSN - 1434-6044

DOI - 10.1007/s100529801031

Subject(s) - physics , hadron , particle physics , branching fraction , semileptonic decay , electron–positron annihilation , aleph , homogeneous , branching (polymer chemistry) , cabibbo–kobayashi–maskawa matrix , cp violation , nuclear physics , lepton , electron , quark , materials science , composite material , thermodynamics

From a study of the kinematic properties of the final state produced in the semileptonic decays b→Xℓνℓ , the inclusive charmless semileptonic branching ratio of b hadrons is measured. With a sample of 3.6 million hadronic Z decays recorded between 1992 and 1995 with the ALEPH detector at LEP, the value Br(b→Xuℓνℓ) is determined to be (1.73±0.55stat±0.55syst)×10−3 , where Xu represents any charmless hadronic state and b is a mixture of b hadrons weighted by their production rates. This measurement yields the result |Vub|2=(18.68±5.94stat±5.94syst±1.45HQE)×10−6, where the last error comes from the conversion of the branching ratio to the CKM matrix element squared

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