Download or read book Measurements of the Inclusive Semileptonic Branching Fraction of B Mesons at the Upsilon 4S Resonance written by Ruoyu Wang and published by . This book was released on 1994 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the Inclusive Charmless Semileptonic Branching Ratio of B Mesons and Determination Of verticalV sub Ub vertical written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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].

Download or read book Measurement of the Branching Fraction for Inclusive Semileptonic B Meson Decays written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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].

Download or read book Measurement of the Inclusive Charmless Semileptonic Branching Ratio of B Mesons and Determination of written by and published by . This book was released on 2003 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Electron Identification and Measurement of the Inclusive Semileptonic Branching Fraction of B Mesons at the BABAR Experiment written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An algorithm for identification of electrons with the BABAR detector is developed. Based on pure samples of electrons and hadrons obtained from data, we determine the electron identification efficiency to be above 90% for momenta above 0.5 GeV/c in the laboratory frame, while the pion fake rate lies between 0.05% and 0.1%. Based on this algorithm, a measurement of the inclusive lepton momentum spectrum in B meson decays is performed. We analyze 4.13 fb^-1 and 0.97 fb^-1 of data recorded at and slightly below the Upsilon(4S) resonance with the BABAR detector at the PEP-II a symmetric B-Factory. B-Bbar events are tagged by a high momentum electron. Using charge and angular correlations, leptons from a second semileptonic $B$ decay are separated from secondary charm semileptonic decays. The inclusive branching ratio is measured to be (10.85 +-0.22(stat.) +-0.34(sys))% . Combined with the B lifetime we determine |V_cb| = 0.0406 +-0.0009(exp) +-0.0019(theory).

Download or read book Measurement of the B meson Inclusive Semileptonic Branching Fraction and Electron energy Moments written by Christopher John Stepaniak and published by . This book was released on 2004 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the Inclusive Semileptonic Branching Fraction of B Mesons Using Fully Reconstructed B mesons as Tags in the BABAR Experiment written by Valery Miftakhov and published by . This book was released on 2003 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the Inclusive Semileptonic Branching Fraction of B Mesons Using Fully Reconstructed B Mesons as Tags in the BABAR Experiment written by and published by . This book was released on 2004 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: The BABAR experiment at SLAC provides an opportunity for measurement of the Standard Model parameters describing CP violation. A method of measuring the CKM matrix element.

Download or read book Electron Identification and Measurement of the Inclusive Semileptonic Branching Fraction of B Mesons at the BABAR Experiment written by Thorsten Brandt and published by . This book was released on 2002 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Measurement of the Semileptonic Branching Fraction of the B s Meson written by and published by . This book was released on 2012 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report a measurement of the inclusive semileptonic branching fraction of the B{sub s} meson using data collected with the BABAR detector in the center-of-mass energy region above the?(4S) resonance. We use the inclusive yield of? mesons and the? yield in association with a high-momentum lepton to perform a simultaneous measurement of the semileptonic branching fraction and the production rate of B{sub s} mesons relative to all B mesons as a function of center-of-mass energy. The inclusive semileptonic branching fraction of the B{sub s} meson is determined to be?(B{sub s} → l?X) = 9.5{sub -2.0}{sup +2.5}(stat){sub -1.9}{sup +1.1}(syst)%, where l indicates the average of e and?

Download or read book 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 written by Alexei Volk and published by . This book was released on 2009 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the Branching Fraction of Upsilon 4S to B0B0bar written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors report the first measurement of the branching fraction f00 for?(4S) → B°{bar B}°. The data sample consists of 81.7 fb−1 collected at the?(4S) resonance with the BABAR detector at the PEP-II asymmetric-energy ee− storage ring. Using partial reconstruction of the decay {bar B}° → D*+l− {bar?}{sub t} in which only the charged lepton and the soft pion from the decay D*+ → D°?+ are reconstructed, they obtain f00 = 0.487 ± 0.010(stat) ± 0.008(sys). The result does not depend on the branching fractions of {bar B}° → D*+l− {nu}{sub t} and D*+ → D°?+ decays, on the ratio of the charged and neutral B meson lifetimes, nor on the assumption of isospin symmetry.

Download or read book MEASUREMENT OF THE INCLUSIVE ELECTRON SPECTRUM IN CHARMLESS SEMILEPTONIC B DECAYS NEAR THE KINEMATIC ENDPOINT written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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].

Download or read book La P tite du sixi me written by and published by . This book was released on 1917 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the Ratio BR B to X E Nu written by and published by . This book was released on 2006 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors report measurements of the inclusive electron momentum spectra in decays of charged and neutral B mesons, and of the ratio of semileptonic branching fractions [Beta](B 2!Xe[nu]) and [Beta](B° 2!Xe[nu]). These were performed on a sample of 231 million B{bar B} events recorded with the BABAR detector at the [Upsilon](4S) resonance. Events are selected by fully reconstructing a hadronic decay of one B meson and identifying an electron among the decay products of the recoiling {bar B} meson. They obtain [Beta](B 2!Xe[nu])/[Beta](B° 2!Xe[nu]) = 1.084 ± 0.041{sub (stat)} ± 0.025{sub (syst)}.

Download or read book A Measurement of the Inclusive Semileptonic Branching Fractions and Lifetime Ratio of the Bu and Bd Mesons written by Mark Alan Lambrecht and published by . This book was released on 1993 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurements of the B Meson Semileptonic Branching Fraction written by Mark A. Worris and published by . This book was released on 1991 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: