Download or read book Measurement of Inclusive Radiative B meson Decay B arrow Right X subscript S gamma written by Veysi Erkcan Ozcan and published by . This book was released on 2005 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of Inclusive Radiative B Meson Decay B X s Gamma written by and published by . This book was released on 2006 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Radiative decays of the B meson, B 2!X{sub s}[gamma], proceed via virtual flavor changing neutral current processes that are sensitive to contributions from high mass scales, either within the Standard Model of electroweak interactions or beyond. In the Standard Model, these transitions are sensitive to the weak interactions of the top quark, and relatively robust predictions of the inclusive decay rate exist. Significant deviation from these predictions could be interpreted as indications for processes not included in the minimal Standard Model, like interactions of charged Higgs or SUSY particles. The analysis of the inclusive photon spectrum from B 2!X{sub s}[gamma] decays is rather challenging due to high backgrounds from photons emitted in the decay of mesons in B decays as well as ee− annihilation to low mass quark and lepton pairs. Based on 88.5 million B{bar B} events collected by the BABAR detector, the photon spectrum above 1.9 GeV is presented. By comparison of the first and second moments of the photon spectrum with QCD predictions (calculated in the kinetic scheme), QCD parameters describing the bound state of the b quark in the B meson are extracted: m{sub b} = (4.45 ± 0.16) GeV/c2; [mu]{sub {pi}}2 = (0.65 ± 0.29) GeV2. These parameters are useful input to non-perturbative QCD corrections to the semileptonic B decay rate and the determination of the CKM parameter.

Download or read book Studying B S Gamma at BABAR Using a Fully Inclusive Method written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The b [yields] s[gamma] decay represents a possible electromagnetic ''loop'' penguin decay of the B meson. This FCNC process is of high theoretical interest because various scenarios of new physics are expected to have contributions at the same (one loop) level as the Standard Model. The large sample of B[bar B] meson decays collected by the BaBar experiment makes a precision measurement of this rare decay possible. In conjunction with Standard Model predictions at the 10% level, it brings new physics effects into the realm of detection--or seriously constrains models that could predict them. A fully inclusive technique is presented to study the b [yields] s[gamma] transition as a function of photon energy, using 88.5 [+-] 1.0 x 10[sup 6] B[bar B] meson decays collected by the BaBar experiment in the years 2000 to 2002. The expected statistical and systematic uncertainties have been fully determined which enables first comparisons with theoretical predictions and other experimental results. It also lays the basis for the determination of the inclusive branching fraction [Beta](B [yields] X[sub s][gamma]) and the measurement of the photon energy spectrum.

Download or read book Constraints on Light Bottom Squarks from Radiative 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: The presence of a light[tilde b] squark (m[sub[tilde b]][approx] 4 GeV) and gluino (m[sub[tilde g]][approx] 15 GeV) might explain the observed excess in b-quark production at the Tevatron. Though provocative, this model is not excluded by present data. The light supersymmetric particles can induce large flavor-changing effects in radiative decays of B mesons. We analyze the decays B[yields] X[sub s][gamma] and B[yields] X[sub sg] in this scenario and derive restrictive bounds on the flavor-changing quark-squark-gluino couplings.

Download or read book Measurement of Inclusive B Meson Decays Into Baryons written by ARGUS Collaboration and published by . This book was released on 1988 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurements of the B to Xs Gamma Branching Fraction and Spectral Shape from a Sum of Exclusive Final States written by and published by . This book was released on 2005 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using 88.9 million B{bar B} events collected by the BABAR detector at the?(4S), they measure the branching fraction for the radiative penguin process B → X{sub s}? from the sum of 38 exclusive final states. The inclusive branching fraction above a minimum photon energy E{sub?}> 1.9 GeV is?(b → s?) = (3.27 ± 0.18(stat.){sub -0.40}{sup +0.55}(syst.){sub -0.09}{sup +0.04}(theory)) x 10−4. They also measure the isospin asymmetry between B− → X{sub s{bar u}}? and {bar B}° → X{sub sd}{gamma} to be?0 = -0.006 ± 0.058(stat.) ± 0.009(syst.) ± 0.024({bar B}°/B−). The photon energy spectrum is measured in the B rest frame, from which moments are derived for different values of the minimum photon energy. They present fits to the photon spectrum and moments which give the heavy-quark parameters m{sub b} and?{sub {pi}}2. The fitted parameters are consistent with those obtained from semileptonic B → X{sub c}l? decays, and are useful inputs for the extraction of.

Download or read book Measurement of inclusive B meson decays into baryons written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book First Measurement of the Rate for the Inclusive Radiative Penguin Decay B S gamma written by Jesse Abram Ernst and published by . This book was released on 1995 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the B to Xs GammaBranching Fraction and Photon Energy Spectrum Usingthe Recoil Method written by and published by . This book was released on 2007 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of the branching fraction and photon energy spectrum for the decay B → X{sub s}[gamma] using data from the BABAR experiment. The data sample corresponds to an integrated luminosity of 210 fb−1, from which approximately 680,000 B{bar B} events are tagged by a fully reconstructed hadronic decay of one of the B mesons. In the decay of the second B meson, an isolated high-energy photon is identified. We measure [Beta](B → X{sub s}[gamma]) = (3.66 ± 0.85{sub stat} ± 0.60{sub syst}) x 10−4 for photon energies E{sub {gamma}} above 1.9 GeV in the B rest frame. From the measured spectrum we calculate the first and second moments for different minimum photon energies, which are used to extract the heavy-quark parameters m{sub b} and [mu]{sub {pi}}2. In addition, measurements of the direct CP asymmetry and isospin asymmetry are presented.

Download or read book The Inclusive Radiative B XS B X S Gamma Decay in the Standard Model written by Ulrich Haisch and published by . This book was released on 2002 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies of Inclusive Semileptonic B Meson Decays with the BABAR Detector written by and published by . This book was released on 2003 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a brief report on the measurement of the inclusive branching fraction [Beta]({bar B} → X{sub c}l−{bar {nu}}) and the preliminary measurement of the first moment of the hadron mass M{sub X} in such decays. The implications of these results on.

Download or read book The Inclusive Radiative B XS B XS Gamma Decay in the Standard Model written by Ulrich Haisch and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurements of B V Gamma 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 → V[gamma] (V = K*(892), [rho](770), [omega](782), [phi](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 → s transition is B → K*[gamma]. We present the best measurements of the branching fractions, direct CP, and isospin asymmetries of B → K*[gamma]. The analogous b → d transitions are B → [rho][gamma] and B → [omega][gamma], which are suppressed by a factor of.

Download or read book Measurement of B Decays to Phi K Gamma written by B. Aubert and published by . This book was released on 2006 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: We measure the branching fraction of the radiative B{sup -} decay {Beta}(B{sup -} {yields} {phi}K{sup -}{gamma}) = (3.46 {+-} 0.57{sub -0.37}{sup +0.39}) x 10{sup -6}, and set an upper limit on the radiative {bar B}{sup 0} decay {Beta}({bar B}{sup 0} {yields} {phi}{bar K}{sup 0}{gamma})

Download or read book The Inclusive Radiative B XS B X S Gamma Decay in the Standard Model written by Ulrich Haisch and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Inclusive B Meson Semileptonic Decay at the gamma 4S and gamma 5S Resonances written by John David Willins and published by . This book was released on 1992 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Search for Radiative B Meson Decays written by and published by . This book was released on 1991 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: