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Measurement Of Branching Fractions Of Radiative Charm Decays
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Book Synopsis Measurement of Branching Fractions of Radiative Charm Decays by :
Download or read book Measurement of Branching Fractions of Radiative Charm Decays written by and published by . This book was released on 2008 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of the branching fractions for the Cabibbo-favored radiative decay, D° → {bar K}*°?, and the Cabibbo-suppressed radiative decay, D° →??. These measurements are based on a data sample corresponding to an integrated luminosity of 387.1 fb−1, recorded with the BABAR detector at the PEP-II ee− asymmetric-energy collider operating at center-of-mass energies 10.58 and 10.54 GeV. We measure the branching fractions relative to the well-studied decay D° → K−?+ and find?(D° → {bar K}*°?)/?(D° → K−?+) = (8.43 ± 0.51 ± 0.70) x 10−3 and?(D° →??)/?(D° → K−?+) = (7.15 ± 0.78 ± 0.69) x 10−4, where the first error is statistical and the second is systematic. This is the first measurement of?(D° → {bar K}*°?).
Book Synopsis A Simultaneous Measurement of the Branching Fractions of Ten B to Double Charm Decays by :
Download or read book A Simultaneous Measurement of the Branching Fractions of Ten B to Double Charm Decays written by and published by . This book was released on 2008 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents a simultaneous measurement of the branching fractions of ten B --> D{sup (*)}{bar D}{sup (*)} decays. The measurements are derived from a sample of 2.32 x 108 B{bar B} pairs collected by the BABAR detector at the PEP-II B Factory located at Stanford Linear Accelerator Center. The branching fractions (x 10−4) are: -0.10 ± 0.44 ± 0.15 (0.59) for B° -- D°{bar D}°; 1.01 ± 1.07 ± 0.35 (2.92) for B° -- D*°{bar D}°; -1.31 ± 1.05 ± 0.41 (0.92) for B° -- D*°{bar D}*°; 2.81 ± 0.43 ± 0.45 for B° --> DD−; 5.72 ± 0.64 ± 0.71 for B° --> D*D−; 8.11 ± 0.57 ± 0.97 for B° --> D*+D*−; 3.76 ± 0.57 ± 0.45 for B− --> D−D°; 3.56 ± 0.52 ± 0.39 for B− --> D*−D°; 6.30 ± 1.32 ± 0.93 for B− --> D−D*°; and 8.14 ± 1.17 ± 1.11 for B− --> D*−D*°. The first uncertainty is statistical while the second is systematic. The number in parentheses is the 90% upper limit using the Feldman-Cousins method with systematic uncertainties taken into account. These measurements are consistent with the Standard Model predictions using the factorization assumption.
Book Synopsis A Simultaneous Measurement of the Branching Fractions of Ten B to Double Charm Decays by : Chung Khim Lae
Download or read book A Simultaneous Measurement of the Branching Fractions of Ten B to Double Charm Decays written by Chung Khim Lae and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Charm Physics written by Minghan Ye and published by CRC Press. This book was released on 1988 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis B Decays (Revised 2nd Edition) by : Sheldon Stone
Download or read book B Decays (Revised 2nd Edition) written by Sheldon Stone and published by World Scientific. This book was released on 1994-08-01 with total page 673 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 2nd edition is an extensive update of 'B Decays”. The revisions are necessary because of the extensive amount of new data and new theoretical ideas. This book reviews what is known about b-quark decays and also looks at what can be learned in the future.The importance of this research area is increasing, as evidenced by the approval of the luminosity upgrade for CESR and the asymmetric B factories at SLAC and KEK, and the possibility of experiments at hadron colliders.The key experimental observations made thus far, measurement of the lifetimes of the different B species, B0-B0 mixing, the discovery of “Penguin” mediated decays, and the extraction of the CKM matrix elements Vub and Vcb from semileptonic decays, as well as more mundane results, are described in great detail by the experimentalists who have been closely involved with making the measurements. Theoretical progress in understanding b-quark decays using HQET and lattice gauge techniques are described by theorists who have developed and used these techniques.Synthesizing the experimental and theoretical information, several articles discuss the implications for the “Standard Model” and how further tests can be done using measurements of CP violation in the B system.
Book Synopsis Measurement of the Radiative Decay Branching Fraction in the MEG Experiment by : Feng Xiao
Download or read book Measurement of the Radiative Decay Branching Fraction in the MEG Experiment written by Feng Xiao and published by . This book was released on 2010 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: A measurement of the radiative muon decay [mu] --> e v e̳ v [m̳u̳] [gamma] branching fraction was done on the basis of the radiative decay data of MEG experiment. The data were taken periodically one day per week with the beam intensity of 1.2x106 [mu] + / s from September to December, 2008. The positron was measured by a spectrometer with gradient magnetic field. The photon was detected by an innovative ̃900 liter liquid xenon scintillation detector. The measurement was carried out with a cut-and-count approach. We report the radiative muon decay branching fraction to be B([mu] --> e vv̄ [gamma]) = (2.84 ± 0.20(stat) ± 0.05(syst))x10−7, with Ee̳> 46 MeV, E [gamma]> 30 MeV, and the opening angle between the two particles [theta] e̳ [gamma] in its full kinematic range. Distributions of three observables, E e̳, E [gamma], and [theta] e̳ [gamma], as well as their kinematic correlations were verified to be consistent with the radiative decays. The measurement is in excellent agreement with the prediction of the Standard Model.
Book Synopsis Charm Decays at BABAR. by : Charles (M.)
Download or read book Charm Decays at BABAR. written by Charles (M.) and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of several studies of charmed mesons and baryons at BABAR are presented. First, searches for the rare decays D{sup 0} {yields} l{sup +}l{sup -} are presented and new upper limits on these processes are established. Second, a measurement of the branching fraction of the isospin-violating hadronic decay D*{sub s}(2112){sup +} {yields} D{sub s}{sup +}{pi}{sup 0} relative to the radiative decay D*{sub s}(2112){sup +} {yields} D{sub s}{sup +}{gamma} is made. Third, the decays of D*{sub sJ}(2317){sup +} and D{sub sJ}(2460){sup +} mesons are studied and ratios of branching fractions are measured. Fourth, Cabibbo-suppressed decays of the {Lambda}{sub c}{sup +} are examined and their branching fractions measured relative to Cabibbo-allowed modes. Fifth, the {Chi}{sub c}{sup 0} is studied through its decays to {Chi}{sup -}{pi}{sup +} and {Omega}{sup -}K{sup +}; in addition to measuring the ratio of branching fractions for {Chi}{sub c}{sup 0} produced from the c{bar c} continuum, the uncorrected momentum spectrum is measured, providing clear confirmation of {Chi}{sub c}{sup 0} production in B decays.
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.
Download or read book Measurements of B to V? Decays written by and published by . This book was released on 2010 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: The standard model has been highly successful at describing current experimental data. However, extensions of the standard model predict particles that have masses at energy scales that are above the electroweak scale. The flavor-changing neutral current processes of the B meson are sensitive to the influences of these new physics contributions. These processes proceed through loop diagrams, thus allowing new physics to enter at the same order as the standard model. New physics may contribute to the enhancement or suppression of rate asymmetries or the decay rates of these processes. The transition B 2!V? (V = K*(892),?(770),?(782),?(1020)) represents radiative decays of the B meson that proceed through penguin processes. Hadronic uncertainties limit the theoretical accuracy of the prediction of the branching fractions. However, uncertainties, both theoretical and experimental, are much reduced when considering quantities involving ratios of branching fractions, such as CP or isospin asymmetries. The most dominant exclusive radiative b 2!s transition is B 2!K*?. We present the best measurements of the branching fractions, direct CP, and isospin asymmetries of B 2!K*?. The analogous b 2!d transitions are B 2!?? and B 2!??, which are suppressed by a factor of.
Book Synopsis Upper Limits on Inclusive Branching Fractions to Narrow States in Radiative J/psi Decays by : Gregory P. Dubois
Download or read book Upper Limits on Inclusive Branching Fractions to Narrow States in Radiative J/psi Decays written by Gregory P. Dubois and published by . This book was released on 1992 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of Some Charm Particle Decay Branching Ratios by : Jaime Pañella Comellas
Download or read book Measurement of Some Charm Particle Decay Branching Ratios written by Jaime Pañella Comellas and published by . This book was released on 1987 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Book Synopsis A Measurement of the Branching Ratio for the Radiative Decay of the Sigma and Hyperon by : A. T. Wood
Download or read book A Measurement of the Branching Ratio for the Radiative Decay of the Sigma and Hyperon written by A. T. Wood and published by . This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Improved Measurements of the Branching Fractions for B0 Into Pi+pi- and B0 Into K+pi-, and a Search for B0 Into K+K- by :
Download or read book Improved Measurements of the Branching Fractions for B0 Into Pi+pi- and B0 Into K+pi-, and a Search for B0 Into K+K- 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 present measurements of the branching fractions for the charmless two-body decays B° →??− and B° → K+?−, and a search for the decay B° → K+K−. They include the effects of final-state radiation from the daughter mesons for the first time, and quote branching fractions for the inclusive processes B° → h+h'−n?, where h and h' are pion or kaons. The maximum value of the sum of the energies of the n undetected photons, E{sub {gamma}}{sup max}, is mode-dependent. Using a data sample of approximately 227 million?(4S) → B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e− collider at SLAC.
Book Synopsis Measurement of the Branching Fraction for the DecayB^{\pm} to K^{*\pm} Gamma, K^{*\pm} ToK^{\pm} \pi^{0} with the BaBar Detector by : K. Koeneke
Download or read book Measurement of the Branching Fraction for the DecayB^{\pm} to K^{*\pm} Gamma, K^{*\pm} ToK^{\pm} \pi^{0} with the BaBar Detector written by K. Koeneke and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The branching fraction of the radiative penguin B meson decay B{sup {+-}} {yields} K*{sup {+-}}{gamma} is measured at the PEP-II asymmetric energy e{sup +}e{sup -} collider, operating at a center of momentum energy of 10.58 GeV, the {Upsilon}(4S) resonance. This document concentrates on the case K*{sup {+-}} {yields} K{sup {+-}}{pi}{sup 0}; {pi}{sup 0} {yields} {gamma}{gamma}. This analysis is based on a dataset of 88.2-million {Upsilon}(4S) {yields} B{bar B} events corresponding to 81.3 fb{sup -1} collected with the BABAR detector.
Book Synopsis Measurement of Branching Fractions and Charge Asymmetries for Exclusive B Decays to Charmonium by :
Download or read book Measurement of Branching Fractions and Charge Asymmetries for Exclusive B Decays to Charmonium written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurements of the X c and X b Quarkonium States in pp Collisions with the ATLAS Experiment by : Andrew Chisholm
Download or read book Measurements of the X c and X b Quarkonium States in pp Collisions with the ATLAS Experiment written by Andrew Chisholm and published by Springer. This book was released on 2015-09-14 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis, which won one of the six 2015 ATLAS Thesis Awards, concerns the study of the charmonium and bottomonium bound heavy quark bound states. The first section of the thesis describes the observation of a candidate for the chi_b(3P) bottomonium states. This represented the first observation of a new particle at the LHC and its existence was subsequently confirmed by D0 and LHCb experiments. The second part of the thesis presents measurements of the prompt and non-prompt production of the chi_c1 and chi_c2 charmonium states in proton-proton collisions. These measurements are compared to several theoretical predictions and can be used to inform the development of theoretical models of quarkonium production.
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