Measurement of the partial branching fraction for inclusive semileptonic B meson decays to light hadrons B→X_1tnulv and an improved determination of the quark mixing matrix element V_1tnu_1tnb [Elektronische Ressource] / von Alexei Volk

Measurement of the Partial Branching Fraction forInclusive Semileptonic B Meson Decays to Light HadronsB→ X l and an Improved Determination of the Quark-uMixing Matrix Element|V |ubDISSERTATIONzur Erlangung des akademischen GradesDoctor rerum naturalium(Dr. rer. nat.)vorgelegtder Fakultät Mathematik und Naturwissenschaftender Technischen Universität DresdenvonDiplom-Physiker Alexei Volkgeboren am 16. Februar 1978 in WinogradnojenGutachter :AbstractThis thesis presents an analysis of inclusive semileptonic B→ X e decays using approximatelyu e454 million (4S)→ BB decays collected during the years 1999 to 2008 with the BABAR detector.2The electron energy, E , and the invariant mass squared of the electron-neutrino pair, q , are recon-estructed, where the neutrino kinematics is deduced from the decay products of both B mesons. Thefinal hadronic state, X , consists of a sum of many hadronic channels, each of which contains at leastu2one u quark. The variables q and E are then combined to compute the maximum kinematicallyemaxallowed invariant mass squared of the hadronic system, s . Using these kinematic quantities, thehpartial branching fraction, B(B→ X l ), unfolded for detector effects, is measured to beumax 2 −4B(E > 2.0GeV,s < 3.52GeV )=(3.33± 0.18± 0.21)× 10e hin the (4S) andmax 2 −4˜ ˜B(E > 1.9GeV,s˜ < 3.5GeV )=(4.57± 0.24± 0.32)× 10e hin the B meson rest frames. The quoted errors are statistical and systematic, respectively.