Measurement of branching fractions and form factor parameters of B->Dlnu and B->D*lnu decays at BaBar

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dc.contributor.authorHamano, Kenji
dc.contributor.supervisorKowalewski, Robert
dc.date.accessioned2008-10-16T21:42:48Z
dc.date.available2008-10-16T21:42:48Z
dc.date.copyright2008en_US
dc.date.issued2008-10-16T21:42:48Z
dc.degree.departmentDept. of Physics and Astronomyen_US
dc.degree.levelDoctor of Philosophy Ph.D.en_US
dc.description.abstractWe use a global fit to determine the form factor slopes and branching fractions of the decays B --> Dlnu and B --> D*lnu. We reconstruct Dl pairs and construct a 3-dimensional distribution binned in lepton momentum, D momentum and cosTheta(B-Dl). These kinematic variables provide good separation between the signal and background. We fit electron and muon samples separately and combine them after calculating systematic uncertainties. The form factor slopes, rhoD^2 for B --> Dlnu and rho^2 for B --> D*lnu decays, are measured to be rhoD^2 = 1.22 +- 0.04 +- 0.07 and rho^2 = 1.21 +- 0.02 +- 0.07, where the errors are statistical and systematic, respectively. Branching fractions are fitted to be B(B+ --> D0lnu) = (2.36 +- 0.03 +- 0.12) % and B(B^+ --> D*0lnu) = (5.37 +- 0.02 +- 0.21) %. We use these results to determine the products, G(1)|Vcb| = (43.8 +- 0.8 +- 2.3)*10^{-3} and F(1)|Vcb| = (35.7 +- 0.2 +- 1.2)*10^{-3} of the form factors at zero recoil and the CKM matrix element |Vcb|, from which |Vcb| can be extracted using theoretical input.en_US
dc.identifier.urihttp://hdl.handle.net/1828/1224
dc.languageEnglisheng
dc.language.isoenen_US
dc.rightsAvailable to the World Wide Weben_US
dc.subjectbranching fractionen_US
dc.subjectform factor slopeen_US
dc.subjectCKM matrixen_US
dc.subjectVcben_US
dc.subjectB mesonen_US
dc.subjectsemileptonic decaysen_US
dc.subject.lcshUVic Subject Index::Sciences and Engineering::Physicsen_US
dc.titleMeasurement of branching fractions and form factor parameters of B->Dlnu and B->D*lnu decays at BaBaren_US
dc.typeThesisen_US

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