Measurement Of The Branching Fraction For Inclusive Semileptonic B Meson Decays PDF Download
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Release | : 2003 |
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Download Measurement of the Branching Fraction for Inclusive Semileptonic B Meson Decays Book in PDF, ePub and Kindle
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].
Author | : Alexei Volk |
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Total Pages | : 127 |
Release | : 2009 |
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Download Measurement of the Partial Branching Fraction for Inclusive Semileptonic B Meson Decays to Light Hadrons B->Xu L Nu and an Improved Determination of the Quark-mixing Matrix Element V Ub Book in PDF, ePub and Kindle
Author | : Alexei Volk |
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Total Pages | : 127 |
Release | : 2009 |
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Download Measurement of the Partial Branching Fraction for Inclusive Semileptonic B Meson Decays to Light Hadrons B->Xulv and an Improved Determination of the Quark Mixing Matrix Element Vub Book in PDF, ePub and Kindle
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Total Pages | : 7 |
Release | : 2003 |
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Download Measurement of the Inclusive Charmless Semileptonic Branching Ratio of B Mesons and Determination of Book in PDF, ePub and Kindle
We report a measurement of the inclusive charmless semileptonic branching fraction of B mesons in a sample of 89 million B{bar B} events recorded with the BABAR detector at the [Upsilon](4S) resonance. Events are selected by fully reconstructing the decay of one B meson and identifying a charged lepton from the decay of the other B meson. The number of signal events is extracted from the hadronic mass distribution and is used to determine the ratio of branching fractions [Beta]({bar B} → X{sub u}l{bar {nu}})/[Beta]({bar B} → Xl{bar {nu}}) = (2.06 ± 0.25(stat) ± 0.23(syst) ± 0.36(theo)) x 10−2. Using the measured branching fraction for inclusive semileptonic B decays, we find [Beta]({bar B} → X{sub u}l{bar {nu}}) = (2.24 ± 0.27(stat) ± 0.26(syst) ± 0.39(theo)) x 10−3 and derive the CKM matrix element.
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Release | : 2003 |
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Download Measurement of the Inclusive Charmless Semileptonic Branching Ratio of B Mesons and Determination Of[verticalV[sub Ub][vertical Book in PDF, ePub and Kindle
We report a measurement of the inclusive charmless semileptonic branching fraction of B mesons in a sample of 89 million B[bar B] events recorded with the BABAR detector at the[Upsilon](4S) resonance. Events are selected by fully reconstructing the decay of one B meson and identifying a charged lepton from the decay of the other B meson. The number of signal events is extracted from the hadronic mass distribution and is used to determine the ratio of branching fractions[Beta]([bar B][yields] X[sub u]l[bar[nu]])/[Beta]([bar B][yields] Xl[bar[nu]])= (2.06[+-] 0.25(stat)[+-] 0.23(syst)[+-] 0.36(theo)) x 10[sup -2]. Using the measured branching fraction for inclusive semileptonic B decays, we find[Beta]([bar B][yields] X[sub u]l[bar[nu]])= (2.24[+-] 0.27(stat)[+-] 0.26(syst)[+-] 0.39(theo)) x 10[sup -3] and derive the CKM matrix elementV[sub ub]= (4.62[+-] 0.28(stat)[+-] 0.27(syst)[+-] 0.48(theo)) x 10[sup -3].
Author | : Ruoyu Wang |
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Total Pages | : 312 |
Release | : 1994 |
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Download Measurements of the Inclusive Semileptonic Branching Fraction of B Mesons at the Upsilon(4S) Resonance Book in PDF, ePub and Kindle
Author | : Daniel Edward Azzopardi |
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Total Pages | : 183 |
Release | : 2003 |
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Download A Measurement of the Inclusive Semileptonic B Meson Branching Fraction at Babar Book in PDF, ePub and Kindle
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Release | : 2009 |
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Download Measurement of the Partial Branching Fraction for Inclusive Semileptonic B Meson Decays to Light Hadrons B-]Xu L Nu and an Improved Determination of the Quark-Mixing Matrix Element |V_ub| Book in PDF, ePub and Kindle
This thesis presents an analysis of inclusive semileptonic $B \to X_u e \nu$ decays using approximately 454 million $\Upsilon(4S) \to B \bar{B}$ decays collected during the years 1999 to 2008 with the BABAR detector. The electron energy, $E_e$, and the invariant mass squared of the electron-neutrino pair, $ q^2$, are reconstructed, where the neutrino kinematics is deduced from the decay products of both B mesons. The final hadronic state, $ X_u$, consists of a sum of many hadronic channels, each of which contains at least one $u$ quark. The variables $q^2$ and $E_e$ are then combined to compute the maximum kinematically allowed invariant mass squared of the hadronic system, $s_h^{max}$. Using these kinematic quantities, the partial branching fraction, $\Delta BR(B \to X_u e \nu)$, unfolded for detector effects, is measured to be $\Delta BR(E_e>2.0 GeV, s_h^{max}3.52 GeV^2) = (3.33 \pm 0.18 \pm 0.21) \times 10^{-4} in the $\Upsilon(4S)$ and \Delta \tilde{\BR}(\tilde E_e1.9 GeV, \tilde {s}^{max}_{h}
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Release | : 2003 |
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Download Studies of Inclusive Semileptonic B Meson Decays with the BABAR Detector Book in PDF, ePub and Kindle
This is a brief report on the measurement of the inclusive branching fraction[Beta]([bar B][yields] X[sub c][ell][sup -][bar[nu]]) and the preliminary measurement of the first moment of the hadron mass M[sub X] in such decays. The implications of these results onV[sub cb] are discussed.
Author | : Christopher John Stepaniak |
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Total Pages | : 438 |
Release | : 2004 |
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Download Measurement of the B-meson Inclusive Semileptonic Branching Fraction and Electron-energy Moments Book in PDF, ePub and Kindle