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 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 Exclusive Measurements of the B to S Gamma Transition Rate and Photon Energy Spectrum written by and published by . This book was released on 2012 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: We use 429 fb−1 of ee− collision data collected at the?(4S) resonance with the BABAR detector to measure the radiative transition rate of b → s? with a sum of 38 exclusive final states. The inclusive branching fraction with a minimum photon energy of 1.9 GeV is found to be?({bar B} → Xs?) = (3.29 ± 0.19 ± 0.48) x 10−4 where the first uncertainty is statistical and the second is systematic. We also measure the first and second moments of the photon energy spectrum and extract the best fit values for the heavy-quark parameters, m{sub b} and?{sub {pi}}2, in the kinetic and shape function models.

Download or read book Study of b to S Gamma at BaBar Using the Sum of Exclusive Modes written by Teela Marie Pulliam and published by . This book was released on 2002 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the Branching Fraction and Photon Energy Moments of B to Xs Gamma and A cp B to X s d Gamma written by and published by . This book was released on 2006 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The photon spectrum in B 2!X{sub s}[gamma] decay, where X{sub s} is any strange hadronic state, is studied using a data sample of 88.5 x 106 ee− 2 2!B{bar B} decays collected by the BABAR experiment at SLAC. The partial branching fraction, [Delta][Beta](B 2!X{sub s}[gamma]) = (3.67 ± 0.29(stat.) ± 0.34(sys.) ± 0.29(model)) x 10−4, the first moment E{sub {gamma}} = 2.288 ± 0.025 ± 0.017 ± 0.015 GeV and the second moment E{sub {gamma}}2 = 0.0328 ± 0.0040 ± 0.0023 ± 0.0036 GeV2 are measured for the photon energy range 1.9 GeV E{sub {gamma}}

Download or read book Measurement of the B u00AF u2192 Xs Branching Fraction with a Sum of Exclusive Decays written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We use 772 × 106 BB-bar meson pairs collected at the ?(4S) resonance with the Belle detector to measure the branching fraction for B-bar → Xs?. Our measurement uses a sum-of-exclusives approach in which 38 of the hadronic final states with strangeness equal to +1, denoted by Xs, are reconstructed. The inclusive branching fraction for MXs 2.8 GeV/c2, which corresponds to a minimum photon energy of 1.9 GeV, is measured to be B(B-bar → Xsubs/sub?)=(3.51±0.17±0.33) × 10sup–4

Download or read book Study of B S Gamma at BaBar Using the Sum of Exclusive Modes written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The electromagnetic penguin process b [yields] s[gamma] is very interesting to theorists because it can be used to constrain contributions from new physics that could enter at the one loop level. The high statistics of B[bar B] events collected at the BABAR experiment make a measurement of this rare decay possible. The branching fraction of a sum of exclusive b [yields] s[gamma] decay modes is measured as a function of the strange hadronic mass. This is a large step toward the measurement of the b [yields] s[gamma] rate.

Download or read book Measurement of B Xsl l Branching Fraction with a Sum Over Exclusive Modes written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We measure the branching fraction for the flavor-changing neutral-current process B [yields] X[sub s][ell][sup +][ell][sup -] with a sample of 89 x 10[sup 6] [Upsilon](4S) [yields] B[bar B] events recorded with the BABAR detector at the PEP-II e[sup +]e[sup -] storage ring. The final state is reconstructed from e[sup +]e[sup -] or [mu][sup +][mu][sup -] pairs and a hadronic system X[sub s] consisting of one K[sup [+-]] or K[sub s][sup 0] and up to two pions, with at most one [pi][sup 0]. We observe a signal of 40 [+-] 10(stat) [+-] 2(syst) events and extract the inclusive branching fraction [Beta] (B [yields] X[sub s][ell][sup +][ell][sup -]) = (5.6 [+-] 1.5(stat) [+-] 0.6(exp syst) [+-] 1.1(model syst)) x 10[sup -6] for m[sub [ell][sup +][ell][sup -]]> 0.2 GeV/c[sup 2].

Download or read book Measurement of Branching Fractions and Mass Spectra of B to K Pi Pi Gamma written by J. C. Chen and published by . This book was released on 2005 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a measurement of the partial branching fractions and mass spectra of the exclusive radiative penguin processes B {yields} K{pi}{pi}{gamma} in the range m{sub K{pi}{pi}}

Download or read book Measurement of Branching Fractions in Radiative BDecays to Eta K Gamma and Search for B Decays to Eta K Gamma written by B. Aubert and published by . This book was released on 2006 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present measurements of the B {yields} {eta}K{gamma} branching fractions and upper limits for the B {yields} {eta}'K{gamma} branching fractions. For B{sup +} {yields} {eta}K{sup +}{gamma} they also measure the time-integrated charge asymmetry. The data sample, collected with the BABAR detector at the Stanford Linear Accelerator Center, represents 232 x 10{sup 6} produced B{bar B} pairs. The results for branching fractions and upper limits at 90% C.L. in units of 10{sup -6} are: {Beta}(B{sup 0} {yields} {eta}K{sup 0}{gamma}) = 11.3{sub -2.6}{sup +2.8} {+-} 0.6, {Beta}(B{sup +} {yields} {eta}K{sup +}{gamma}) = 10.0 {+-} 1.3 {+-} 0.5, {Beta}(B{sup 0} {yields} {eta}'K{sup 0}{gamma})

Download or read book Measuring B to S Gamma B to D Gamma and written by and published by . This book was released on 2012 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using a sample of 471 million B{bar B} events collected with the BaBar detector, we study the sum of seven exclusive final states b → X{sub s(d)}?, where X{sub s(d)} is a strange (non-strange) hadronic system with a mass of up to 2.0 Gev/c2. After correcting for unobserved decay modes, we obtain a branching fraction for b → d? of (9.2 ± 2.0(stat.) ± 2.3(syst.)) x 10−6 in this mass range, and a branching fraction for b → s? of (23.0 ± 0.8(stat.) ± 3.0(syst.)) x 10−5 in the same mass range. We find BF(b → d?)/BF(b → s?) = 0.040 ± 0.009(stat.) ± 0.010(syst.), from which we determine.

Download or read book Study of B S Gamma at BaBar Using the Sum of Exclusive Modes written by Teela Maria Pulliam and published by . This book was released on 2002 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurements of Branching Fractions for B Rho Gamma B0 Rho0 Gamma and B0 Omega Gamma written by and published by . This book was released on 2008 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present branching fraction measurements for the radiative decays B →?+?, B° →?°?, and B° →??. The analysis is based on a data sample of 465 million B{bar B} events collected with the BABAR detector at the PEP-II asymmetric-energy B Factory located at the Stanford Linear Accelerator Center (SLAC). They find?(B+ →?+?) = (1.20{sub -0.37}{sup +0.42} ± 0.20) x 10−6,?(B° →?°?) = (0.97{sub -0.22}{sup +0.24} ± 0.06) x 10−6, and a 90% C.L. upper limit?(B° →??)

Download or read book Measurements of B V Gamma Decays written by Aaron Kevin Yarritu and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Observational evidence and theoretical motivation have led us to the conclusion that our current understanding of the universe is incomplete. While new physics is expected to exist above the electroweak scale, its influence can be detected by experiments that operate below this scale. The Babar experiment has recorded approximately 432 fb-1 of data at the center of mass energy of 10.58 GeV, which corresponds to the Y(4S) mass. One of the physics programs is studying radiative decays of the B meson. These decays primarily proceed through loop diagrams, and thus influences of new particles may be detectable. In this thesis, I present results of the measurements of the branching fractions, CP asymmetry, and isospin asymmetry of B -> K* gamma. Results are also presented for the measurements of the branching fractions of B -> rho(omega) gamma. Finally, a search for the decay of B -> phi gamma is given.

Download or read book Branching Fraction Measurements of B to Rho Gamma B0 to Rho0 Gamma and B0 to Omega Gamma written by and published by . This book was released on 2007 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a study of the decays B →?+?, B° →?°?, and B° →??. The analysis is based on data containing 347 million B{bar B} events recorded with the BABAR detector at the PEP-II asymmetric B factory. They measure the branching fractions?(B+ →?+?) = (1.10{sub -0.33}{sup +0.37} ± 0.09) x 10−6 and?(B° →?°?) = (0.79{sub -0.20}{sup +0.22} ± 0.06) x 10−6, and set a 90% C.L. upper limit?(B° →??)

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 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: The b → 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 → s[gamma] transition as a function of photon energy, using 88.5 ± 1.0 x 106 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 → X{sub s}[gamma]) and the measurement of the photon energy spectrum.

Download or read book A profile of final states in B Xs gamma and an estimate of the branching ration BR B K gamma written by A. Ali and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: