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Measurement Of The Branching Fractions Of Bbar D L Nubar L Decays In Events Tagged By A Fully Reconstructed B Meson
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Book Synopsis Measurement of the Branching Fractions of Bbar -] D** L^- Nubar_l Decays in Events Tagged by a Fully Reconstructed B Meson by :
Download or read book Measurement of the Branching Fractions of Bbar -] D** L^- Nubar_l Decays in Events Tagged by a Fully Reconstructed B Meson written by and published by . This book was released on 2008 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report a measurement of the branching fractions of {bar B} 2!D** l−{bar {nu}}{sub l} decays based on 417 fb−1 of data collected at the [Upsilon](4S) resonance with the BABAR detector at the PEP-II ee− storage rings. Events are selected by fully reconstructing one of the B mesons in a hadronic decay mode. A fit to the invariant mass differences m(D{sup (*)})-m(D{sup (*)}) is performed to extract the signal yields of the different D** states. We observe the {bar B} 2!D**{ell}−{bar {nu}}{sub {ell}} decay modes corresponding to the four D** states predicted by Heavy Quark Symmetry with a significance greater than six standard deviations including systematic uncertainties.
Book Synopsis Measurement of the Relative Branching Fractions of Bbar to D/D*/D** L- Nubar_l Decays in Events with a Fully Reconstructed B Meson by :
Download or read book Measurement of the Relative Branching Fractions of Bbar to D/D*/D** L- Nubar_l Decays in Events with a Fully Reconstructed B Meson written by and published by . This book was released on 2007 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: We determine the relative branching fractions of semileptonic B decays to charmed final states. The measurement is performed on the recoil from a fully reconstructed B meson in a sample of 362 million B{bar B} pairs collected at the [Upsilon](4S) resonance with the BABAR detector. A simultaneous fit to a set of discriminating variables is performed on a sample of {bar B} → DXl−{bar {nu}}{sub {ell}} decays to determine the contributions from the different channels.
Book Synopsis A Measurement of the Branching Fractions Ofexclusive Bbar to D(*)(pi)lnu Decays in Events with a Fully Reconstructed BMeson by :
Download or read book A Measurement of the Branching Fractions Ofexclusive Bbar to D(*)(pi)lnu Decays in Events with a Fully Reconstructed BMeson written by and published by . This book was released on 2008 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors report a measurement of the branching fractions for {bar B} → D{sup (*)}?l−{bar ?}{sub l} decays based on 341.1 fb−1 of data collected at the ?(4S) resonance with the BABAR detector at the PEP-II e+e− storage rings. Events are tagged by fully reconstructing one of the B mesons in a hadronic decay mode. The obtain ?(B− → D°l−{bar ?}{sub l}) = (2.33 ± 0.09{sub stat.} ± 0.09{sub syst.})%, ?(B− → D*°l−{bar ?}{sub l}) = 5.83 ± 0.15{sub stat.} ± 0.30{sub syst.}%, ?({bar B}° → D+l−{bar ?}{sub l}) = (2.21 ± 0.11{sub stat.} ± 0.12{sub syst.})% ?({bar B}° → D*+l−{bar ?}{sub l}) = 5.49 ± 0.16{sub stat.} ± 0.25{sub syst.}%, ?(B− → D+?−l−{bar ?}{sub l}) = (0.42 ± 0.06{sub stat.} ± 0.03{sub syst.})%, ?(B− → D*+ ?−l−{bar ?}{sub l}) = (0.59 ± 0.05{sub stat.} ± 0.04{sub syst.})%, ?({bar B}° → D°?+l−{bar ?}{sub l}) = (0.43 ± 0.08{sub stat.} ± 0.03{sub syst.})% and ?({bar B}° → D*° ?+l−{bar ?}{sub l}) = (0.48 ± 0.08{sub stat.} ± 0.04{sub syst.})%.
Book Synopsis Study of Bbar to Xu L Nubar Decays in BBbar Events Tagged by a Fully Reconstructed B-meson Decay and Determination of by :
Download or read book Study of Bbar to Xu L Nubar Decays in BBbar Events Tagged by a Fully Reconstructed B-meson Decay and Determination of written by and published by . This book was released on 2012 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report measurements of partial branching fractions for inclusive charmless semileptonic B decays {bar B} → X{sub u}l{bar {nu}}, and the determination of the CKM matrix element.
Book Synopsis Measurement of the Inclusive Semileptonic Branching Fraction of B Mesons Using Fully Reconstructed B-Mesons as Tags in the BABAR Experiment by :
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 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 V[sub cb] using Inclusive Semileptonic B decays in events tagged by a fully reconstructed decay of one of the B mesons is presented here. This mode is considered to be one of the most powerful approaches due to its large branching fraction, simplicity of the theoretical description and very clean experimental signatures. Using fully reconstructed B mesons to flag B[bar B] event we were able to produce the spectrum and branching fraction for electron momenta P[sub C.M.S.]> 0.5 GeV/c. Extrapolation to the lower momenta has been carried out with Heavy Quark Effective Theory. The branching fractions are measured separately for charged and neutral B mesons. For 82 fb[sup -1] of data collected at BABAR we obtain: BR(B[sup [+-]] [yields] X e[bar [nu]]) = 10.63 [+-] 0.24 [+-] 0.29%, BR(B[sup 0] [yields] X e[bar [nu]]) = 10.68 [+-] 0.34 [+-] 0.31%, averaged BR(B [yields] X e[bar [nu]]) = 10.65 [+-] 0.19 [+-] 0.27%, ratio of Branching fractions BR(B[sup [+-]])/BR(B[sup 0]) = 0.996 [+-] 0.039 [+-] 0.015 (errors are statistical and systematic, respectively). They also obtain V[sub cb] = 0.0409 [+-] 0.00074 [+-] 0.0010 [+-] 0.000858 (errors are: statistical, systematic and theoretical).
Book Synopsis An Inclusive Measurement of the Branching Fraction for the B{u2192}s? Using the Recoil of Fully Reconstructed B Meson Decays by : Clare Louise Brown
Download or read book An Inclusive Measurement of the Branching Fraction for the B{u2192}s? Using the Recoil of Fully Reconstructed B Meson Decays written by Clare Louise Brown and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Inclusive Measurement of the Branching Fraction for the B{602}s{222} Using the Recoil of Fully Reconstructed B Meson Decays by : Clare Louise Brown
Download or read book An Inclusive Measurement of the Branching Fraction for the B{602}s{222} Using the Recoil of Fully Reconstructed B Meson Decays written by Clare Louise Brown and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Inclusive Measurement of the Branching Fraction for the B{u2192}s? Using the Recoil of Fully Reconstructed B Meson Decays by : Clare Louise Brown
Download or read book An Inclusive Measurement of the Branching Fraction for the B{u2192}s? Using the Recoil of Fully Reconstructed B Meson Decays written by Clare Louise Brown and published by . This book was released on 2005 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Branching Fraction for B+ -] Pi0 L+ Nu, Measured in Upsilon (4S) -] BBbar Events Tagged by B- -] D0 L- Nubar (X) Decays by : J. C. Chen
Download or read book Branching Fraction for B+ -] Pi0 L+ Nu, Measured in Upsilon (4S) -] BBbar Events Tagged by B- -] D0 L- Nubar (X) Decays written by J. C. Chen and published by . This book was released on 2005 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report a preliminary branching fraction of (1.80 {+-} 0.37{sub stat.} {+-} 0.23{sub syst.}) x 10{sup -4} for the charmless exclusive semileptonic B{sup +} {yields} {pi}{sup 0}{ell}{sup +}{nu} decay, where {ell} can be either a muon or an electron. This result is based on data corresponding to an integrated luminosity of 81 fb{sup -1} collected at the {Upsilon}(4S) resonance with the BABAR detector. The analysis uses B{bar B} events that are tagged by a B meson reconstructed in the semileptonic B{sup -} {yields} D{sup 0}{ell}{sup -}{bar {nu}}(X) decays, where X can be either a {gamma} or a {pi}{sup 0} from a D* decay.
Download or read book La P'tite du sixième written by and published by . This book was released on 1917 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Crippen wedi ei gondemnio i farw am lofruddio a darnio ei wraig a'i chladdu yn seler ei dy by :
Download or read book Crippen wedi ei gondemnio i farw am lofruddio a darnio ei wraig a'i chladdu yn seler ei dy written by and published by . This book was released on 18?? with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Inclusive Measurement of the Branching Fraction for the B{u2192}sÞ Using the Recoil of Fully Reconstructed B Meson Decays by : Clare Louise Brown
Download or read book An Inclusive Measurement of the Branching Fraction for the B{u2192}sÞ Using the Recoil of Fully Reconstructed B Meson Decays written by Clare Louise Brown and published by . This book was released on 2005 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis MEASUREMENT OF THE BRANCHING FRACTIONS FOR INCLUSIVE B[sup -] AND [bar B][sup 0] DECAYS TO FLAVOR-TAGGED D, D[sub S] AND LAMBDA[sub C]. by :
Download or read book MEASUREMENT OF THE BRANCHING FRACTIONS FOR INCLUSIVE B[sup -] AND [bar B][sup 0] DECAYS TO FLAVOR-TAGGED D, D[sub S] AND LAMBDA[sub C]. written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors report on the inclusive branching fractions of B[sup -] and of [bar B][sup 0] mesons decaying to D[sup 0]X, [bar D][sup 0]X, D[sup +]X, D[sup -]X, D[sub s][sup +]X, D[sub s][sup -]X, [Lambda][sub c][sup +]X, [bar [Lambda]][sub c][sup -]X, based on a sample of 88.9 million B[bar B] events recorded with the BABAR detector at the [Upsilon](4S) resonance. Events are selected by completely reconstructing one B and searching for a reconstructed charmed particle in the rest of the event. The authors measure the number of charmed and of anit-charmed particles per B decay and derive the total charm yield per B[sup -] decay, n[sub c][sup -] = 1.313 [+-] 0.037 [+-] 0.037 [+-] 0.062[sub -0.043][sup +0.063], and per [bar B][sup 0] decay, n[sub c][sup 0] = 1.276 [+-] 0.062 [+-] 0.058[sub -0.046][sup +0.066] where the first uncertainty is statistical, the second is systematic, and the third reflects the charm branching-fraction uncertainties.
Book Synopsis Measurement of the Partial Branching Fraction for Inclusive Charmless Semileptonic B Decays and Extraction of by :
Download or read book Measurement of the Partial Branching Fraction for Inclusive Charmless Semileptonic B Decays and Extraction of written by and published by . This book was released on 2005 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Semileptonic B Decays at BaBar written by and published by . This book was released on 2007 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present measurements of the inclusive semileptonic branching fractions of charged and neutral B mesons using 20.6 fb-1 of data measured at the Upsilon(4S) with the BABAR detector. Events are tagged with a fully reconstructed hadronic decay of a B meson. The correlation between the flavor of the tag B meson and the electron charge allows the separation of prompt semileptonic B decays and cascade semileptonic charm decays. We obtain the preliminary inclusive semileptonic branching fraction of charged B mesons b+ = 0.103+/-0.006+/-0.005, neutral B mesons b0 = 0.104+/-0.008+/-0.005, their average b = 0.104+/-0.005+/-0.004, and their ratio b+/b0 = 0.99+/-0.10+/-0.03.
Book Synopsis Measurement of the Branching Fractions for the Exclusive Decays of B0 and B+ to Dbar(*)D(*)K. by :
Download or read book Measurement of the Branching Fractions for the Exclusive Decays of B0 and B+ to Dbar(*)D(*)K. written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors report the observation of 823[+-] 57 B[sup 0] and 970[+-] 65 B[sup+] decays to doubly charmed final states[bar D][sup (*)] D[sup (*)]K, where[bar D][sup (*)] and D[sup (*)] are fully reconstructed and K is either a K[sup[+-]] or a K[sup 0]. They use a sample of 82.3[+-] 0.9 million B[bar B] events collected between 1999 and 2002 with the BABAR detector at the PEP-II storage ring at the Stanford Linear Accelerator Center. The 22 possible B decays to[bar D][sup (*)] D[sup (*)]K are reconstructed exclusively and the corresponding branching fractions or limits are determined. The branching fractions of the B[sup 0] and of the B[sup+] to[bar D][sup (*)] D[sup (*)]K are found to be[Beta](B[sup 0][yields][bar D][sup (*)]D[sup (*)]K)= (4.3[+-] 0.3(stat)[+-] 0.6(sys))%, [Beta](B[sup+][yields][bar D][sup (*)] D[sup (*)]K)= (3.5[+-] 0.3(stat)[+-] 0.5(syst))%.
Book Synopsis The Search for Rare Non-hadronic B-meson Decays with Final-state Neutrinos Using the BaBar Detector by : Dana Lindemann
Download or read book The Search for Rare Non-hadronic B-meson Decays with Final-state Neutrinos Using the BaBar Detector written by Dana Lindemann and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "This thesis presents the searches for two rare B meson decays: the radiative leptonic decay B+ -> l+ nu gamma (l = e, mu) and the flavor-changing neutral current B -> K(*) nu nubar. These searches use the full dataset collected by the BaBar experiment, which corresponds to almost 500 million BB pairs. After fully reconstructing the hadronic decay of one of the B mesons in Upsilon(4S) -> BB decays, evidence of B+ -> l+ nu gamma or B -> K(*) nu nubar is looked for in the rest of the event. No significant evidence of either signal decay is observed. Model-independent branching-fraction upper limits are set at BR(B ->e nu gamma)17 x10 {-6}, BR(B -mu nu gamma)24 x10 {-6}, and BR(B -l nu gamma)15.6 x10 {-6}, all at the 90% confidence level. These are currently the most stringent published upper limits for B+ - l+ nu gamma. In addition, branching-fraction upper limits are set at BR(B -> K+ nu nubar)3.7 x10 {-5}, BR(B - K0 nu nubar)8.0 x10 {-5}, BR(B - K*+ nu nubar)11.5 x10 {-5}, and BR(B - K*0 nu nubar)9.2 x10 {-5}, all at the 90% confidence level. For additional sensitivity to New Physics contributions, partial B - K(*) nu nubar branching-fraction upper limits are also determined over the full kinematic range." --
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