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.

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.

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.})%.

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.

Download or read book Measurement of the Relative Branching Fractions for B to D D D D pi ell bar nu ell with a Large Sample of Tagged B Mesons written by B. Aubert and published by . This book was released on 2006 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a study of B semileptonic decays into charm final states based on 211.7 fb{sup -1} of data collected at the {Upsilon}(4S) resonance with the BABAR detector at the PEP-II e{sup +}e{sup -} storage ring. Using a novel technique based on the simultaneous fit of a set of variables reconstructed on the recoil of a B tagged in an hadronic decay mode, we measure the relative branching fractions {Lambda}(B{sup -} {yields} D{sup 0}{ell}{sup -}{bar {nu}}{sub {ell}}) = 0.611 {+-} 0.022 (stat.) {+-} 0.027 (syst.) and {Lambda}(B{sup -} {yields} D**{sup 0})(D{sup (*)}{pi}){ell}{sup -}{bar {nu}}{sub {ell}}/{Lambda}(B{sup -} {yields} DX{ell}{sup -}{bar {nu}}{sub {ell}}) = 0.173 {+-} 0.017 (stat.) {+-} 0.021 (syst.).

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 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:

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:

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:

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))%.

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:

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:

Download or read book Partial Reconstruction of Bz to Dss Dstarm Decays and Measurement of the Ds to Phi Pip Branching Fraction written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Preliminary results are presented on the branching fractions B (B[sup 0] --> D[sub s][sup *+]D[sup *-]) and B (D[sub s][sup +] --> [phi][pi][sup +]), based on a data sample of approximately 124 x 10[sup 6] B[bar B] events collected by the BABAR detector at the PEP-II e[sup +]e[sup -] B-factory. B (B[sup 0] --> D[sub s][sup *+]D[sup *-]) is measured selecting neutral B meson decays to the final state D[sup *-]D[sub s][sup *+] with partial reconstruction of the D[sub s][sup *+], in which only the D[sup *-] and the soft photons from the decay D[sub s][sup *+] --> D[sub s][sup +][gamma] are reconstructed. The branching fraction product B (B[sup 0] --> D[sub s][sup *+]D[sup *-]) [center-dot] B(D[sub s][sup +] --> [phi][pi][sup +]) is measured via a complete reconstruction of the whole decay chain. Comparing these two measurements provides a model-independent determination of the B (D[sub s][sup +] --> [phi][pi][sup +]) branching fraction. The authors obtain the following preliminary results: B(B[sup 0] --> D[sub s][sup *+]D[sup *-]) = (1.85 [+-] 0.09 [+-] 0.16)%; B(D[sub s][sup +] --> [phi][pi][sup +]) = (4.71 [+-] 0.47 [+-] 0.35)% where the first error in each measurement is statistical, the second systematic.

Download or read book Study of B D D s J Decays AndMeasurement of D s and D s J 2460 Branching Fractions written by and published by . This book was released on 2006 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present branching fraction measurements of twelve B meson decays of the form B → D{sup (*)} D{sub s(J)}{sup (*)}. The results are based on?(4S) decays in B{bar B} pairs. One of the B mesons is fully reconstructed and the other decays to two charm mesons, of which one is reconstructed, and the mass and momentum of the other is inferred by kinematics. Combining these results with previous exclusive branching fraction measurements, we determine?(D{sub s}− →??−) = (4.62 ± 0.36{sub stat.} ± 0.51{sub syst.})%,?(D{sub sJ}(2460)− → D*{sub s}−?°) = (56 ± 13{sub stat.} ± 9{sub syst.})% and?(D{sub sJ}(2460)− → D{sub s}−?) = (16 ± 4{sub stat.} ± 3{sub syst.})%.

Download or read book Evidence for B Semileptonic Decays Into the Lambda c Charm Baryon written by and published by . This book was released on 2008 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the first evidence for B semileptonic decays into the charmed baryon [Lambda]{sub c} based on 420 fb−1 of data collected at the [Upsilon](4S) resonance with the BABAR detector at the PEP-II ee− storage rings. Events are tagged by fully reconstructing one of the B mesons in a hadronic decay mode. We measure the relative branching fraction [Beta]({bar B} 2![Lambda]{sub c}+ Xl−{bar {nu}}{sub {ell}})/[Beta]({bar B} 2![Lambda]{sub c}+/{bar {Lambda}}{sub c}−X) = (3.2 ± 0.9{sub stat.} ± 0.9{sub syst.})%. The significance of the signal including the systematic uncertainty is 4.9 standard deviations.

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.

Download or read book Measurement of the Branching Fractions for B0 D pi and B0 D rho written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Using 5.2 fb[sup -1] annihilation data recorded with the BABAR detector at the PEP-II storage ring while operating on the[Upsilon](4S) resonance, a sample of fully reconstructed B[sup 0] decays in the hadronic modes B[sup 0][yields] D*[sup -][pi][sup+] and B[sup 0][yields] D*[sup -][rho][sup+] have been reconstructed. In this paper, a study of these events is reported, including preliminary measurements of the absolute branching fractions for these modes, which are found to be B(B[sup 0][yields] D*[sup -][pi][sup+]= 2.9[+-] 0.3[+-] 0.3) x 10[sup -3] and B(B[sup 0][yields] D*[sup -][rho][sup+])= (11.2[+-] 1.1[+-] 2.5) x 10[sup -3].