MEASUREMENT OF THE INCLUSIVE ELECTRON SPECTRUM IN CHARMLESS SEMILEPTONIC B DECAYS NEAR THE KINEMATIC ENDPOINT. PDF Download
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A preliminary result on the study of the inclusive electron spectrum in B[yields] X[sub u]e[nu] decays above the kinematic limit for the dominant B[yields] X[sub c]e[nu] transitions is presented. This study is performed at the PEP-II asymmetric B Factory, where B meson pairs are produced in the decay of the[Upsilon](4S) resonance. For the electron momentum range of 2.3-2.6 GeV/c in the[Upsilon](4S) rest frame, the partial branching ratio is measured to be[Delta][Beta](B[yields] X[sub u]e[nu])= (0.152[+-] 0.014[+-] 0.014)[center-dot] 10[sup -3].
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A preliminary result on the study of the inclusive electron spectrum in B[yields] X[sub u]e[nu] decays above the kinematic limit for the dominant B[yields] X[sub c]e[nu] transitions is presented. This study is performed at the PEP-II asymmetric B Factory, where B meson pairs are produced in the decay of the[Upsilon](4S) resonance. For the electron momentum range of 2.3-2.6 GeV/c in the[Upsilon](4S) rest frame, the partial branching ratio is measured to be[Delta][Beta](B[yields] X[sub u]e[nu])= (0.152[+-] 0.014[+-] 0.014)[center-dot] 10[sup -3].
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Languages : en
Pages : 5
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The authors study the inclusive electron spectrum of B --> X{sub u}e[nu] decays near the kinematic limit for B --> X{sub c}e[nu] transitions using a sample of 88 million [Upsilon](4S) decays recorded by the BABAR detector at the PEP II ee− storage rings. For the electron momentum interval of 2.0-2.6GeV/c the partial branching fraction is measured to be [Delta]B(B --> X{sub u}e[nu]) = (0.480 ± 0.029(stat) ± 0.053(syst) x 10−3). Combining this result on [Delta]B with measurements of the inclusive photon spectrum in B --> X{sub s}[gamma] transition the authors find.
![Preliminary Measurement of the Inclusive Electron Spectrum in Charmless Semileptonic B Decays Near the Kinematic Endpoint and Determination of [verticalV[sub Ub][vertical PDF](https://books.google.com/books/content/images/frontcover/BhkJkAEACAAJ?fife=w80-h100)
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The authors study the inclusive electron spectrum of B --> X[sub u]e[nu] decays near the kinematic limit for B --> X[sub c]e[nu] transitions using a sample of 88 million [Upsilon](4S) decays recorded by the BABAR detector at the PEP II e[sup +]e[sup -] storage rings. For the electron momentum interval of 2.0-2.6GeV/c the partial branching fraction is measured to be [Delta]B(B --> X[sub u]e[nu]) = (0.480 [+-] 0.029(stat) [+-] 0.053(syst) x 10[sup -3]). Combining this result on [Delta]B with measurements of the inclusive photon spectrum in B --> X[sub s][gamma] transition the authors find V[sub ub] = 3.94 [+-] 0.25exp [+-] 0.37 f[sub u] [+-] 0.19 theory x 10[sup -3], where the first error represents the combined statistical and systematic experimental uncertainty of the partial branching fraction measurement, the second refers to the uncertainty of the determination of the fraction f[sub u] of the inclusive electron spectrum that falls within the cuts, and the third error is due to theoretical uncertainties in the QCD corrections, plus the uncertainty in the b-quark mass. All results are preliminary.
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Languages : en
Pages : 19
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We present a measurement of the inclusive electron spectrum in B → X{sub u}e[nu] decays near the kinematic limit for B → X{sub c}e[nu] transitions, using a sample of 88 million B{bar B} pairs recorded by the BABAR detector at the [Upsilon](4S) resonance. Partial branching fraction measurements are performed in five overlapping intervals of the electron momentum; for the interval of 2.0-2.6 GeV/c we obtain [Delta][Beta](B → X{sub u}e[nu]) = (0.572 ± 0.041{sub stat} ± 0.065{sub syst}) x 10−3. Combining this result with shape function parameters extracted from BABAR measurements of moments of the inclusive photon spectrum in B → X{sub s}[gamma] decays and moments of the hadron mass and lepton energy spectra in B → X{sub c}l[nu] decays we determine.
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Languages : en
Pages : 19
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Charmless semileptonic decays, {bar B} 2!X{sub u}l{bar {nu}}, are studied in a sample of 232 million B{bar B} decays recorded with the BABAR detector, in events where the decay of the second B meson is fully reconstructed. Inclusive charmless decays are selected in kinematic regions where the dominant background from semileptonic B decays to charm is reduced by requirements on the hadronic mass M{sub X} and the momentum transfer q2. The partial branching fraction for {bar B} 2!X{sub u}l{bar {nu}} decays for M{sub X} 1.7 GeV/c2 and q2 8 GeV2/c4 is measured to be [Delta][Beta]({bar b} 2!X{sub u}l{bar {nu}}) = (0.87 ± 0.09{sub stat} ± 0.09{sub sys} ± 0.01{sub th}) x 10−3. The CKM matrix element.
Author: Jeffrey Kevin Nelson
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Languages : en
Pages : 556
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Languages : en
Pages : 37
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A largely model-independent measurement of the inclusive electron momentum spectrum and branching fraction for semileptonic decays of B mesons is presented based on data recorded at the[Upsilon](4S) resonance with the BABAR detector. Backgrounds from secondary charm decays are separated from prompt B decays using charge and angular correlations between the electron from one B meson and a high momentum electron tag from the second B meson. The resulting branching fraction is[Beta](B[yields] Xe[nu])= (10.87[+-] 0.18(stat)[+-] 0.30(syst))%. Based on this measurement we determine the CKM matrix elementV[sub cb].
![Determination of [verticalV[sub Ub][vertical in Inclusive Semileptonic B Meson Decays PDF](https://books.google.com/books/content/images/frontcover/--7CjwEACAAJ?fife=w80-h100)
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The authors present a preliminary determination of the CKM matrix element V[sub ub] based on the analysis of semileptonic B decays from a sample of 88 million [Upsilon](4S) decays collected with the BaBar detector at the e[sup +]e[sup -] storage ring. Charmless semileptonic B decays are selected using the electron energy E-e and the invariant mass q[sup 2] of the electron-neutrino pair. The neutrino meomentum is inferred from a measurement of the visible energy and momentum in the detector and knowledge of the e[sup +]e[sup -] beam momenta. The partial branching fraction is determined in a region of the q[sup 2]-E-e plane where semileptonic B decays to charm are highly suppressed. The total charmless semileptonic branching fraction is extracted using a theoretical calculation based on the heavy quark expansion. Preliminary results yield V[sub ub] = (4.57 [+-] 0.21 [+-] 0.25 [+-] 0.34 + 0.59 - 0.29 [+-] 0.22) x 10[sup -3] where the uncertainties are from statistics (data and MC), detector modeling, background modeling, the shape function, and the heavy quark operator product expansion, respectively.
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Languages : en
Pages : 8
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A measurement of the first four moments of the hadronic mass distribution in B → C{sub c}l{bar [nu]} decays is presented for minimum lepton momenta varying between 0.9 and 1.6 GeV, using data recorded with the BABAR detector. Furthermore, a measurement of the inclusive electron energy spectrum for semileptonic B decays together with a measurement of its first, second and third moments for minimum electron energies between 0.6 and 1.5 GeV is reported. We determine the inclusive B → X{sub c}l{bar {nu}} branching fraction, [Beta]{sub c{ell}{nu}}, the CKM matrix element.
