A Measurement Of The Branching Fraction Of The Semileptonic Decay From The D Meson To The K892 Meson PDF Download

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Measurement of the Branching Fraction for Inclusive Semileptonic B Meson Decays

Measurement of the Branching Fraction for Inclusive Semileptonic B Meson Decays
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Release: 2003
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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].

Measurement of the Branching Fraction of the Semileptonic Decay Anti-B0 ---] D*+ Mu- Anti-Muon-Neutrino in the BaBar Experiments

Measurement of the Branching Fraction of the Semileptonic Decay Anti-B0 ---] D*+ Mu- Anti-Muon-Neutrino in the BaBar Experiments
Author: Douglas Michael Thiessen
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Total Pages: 125
Release: 2005
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This thesis presents a measurement of the branching fraction for the exclusive semileptonic decay {bar B}{sup 0} {yields} D*{sup +}{mu}{sup -}{nu}{sub {mu}}. This decay is essentially the decay of a b quark to a c quark inside the meson with the release of a muon and neutrino, and it provides a very clean signal for measuring various B meson decay properties. the data for this measurement consist of 22.3 million B{bar B} pairs collected by the BABAR detector at the Stanford Linear Accelerator Center in 1999-2000. The branching fraction is measured to be {Beta}({bar B}{sup 0} {yields} D*{sup +}{mu}{sup -}{bar {nu}}{sub {mu}}) = [4.72 {+-} 0.10 (data stat.) {+-} 0.06 (MC stat.) {+-} 0.20 (syst.) {+-} 0.17 (other {Beta})]%.

Measurement of the Branching Fraction of B0 Meson Decay to A_1^+(1260) Pi-

Measurement of the Branching Fraction of B0 Meson Decay to A_1^+(1260) Pi-
Author: J. C. Chen
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Total Pages: 14
Release: 2005
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We present a preliminary measurement of the branching fraction of the B meson decay B{sup 0} {yields} a{sub 1}{sup +}(1260){pi}{sup -}with a{sub 1}{sup +}(1260) {yields} {pi}{sup +}{pi}{sup +}{pi}{sup -}. The data sample corresponds to 218 x 10{sup 6} B{bar B} pairs produced in e{sup +}e{sup -} annihilation through the {Upsilon}(4S) resonance. We find the branching fraction (40.2 {+-} 3.9 {+-} 3.9) x 10{sup -6}, where the first error quoted is statistical and the second is systematic. The fitted values of the a{sub 1}(1260) parameters are m{sub a{sub 1}} = 1.22 {+-} 0.02 GeV/c{sup 2} and {Lambda}{sub a{sub 1}} = 0.423 {+-} 0.050 GeV/c{sup 2}.