Download or read book Measurement of Branching Fractions and CP Violating Asymmetries in B0 u2192 K0 bar K 0 and B to bar K 0K Decays at the BaBar Experiment written by and published by . This book was released on 2007 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last few years, the B factories have established the Cabbibo-Kobayashi-Maskawa mechanism of CP violation in the Standard Model through the study of the decays of B mesons. The focus of Belle and BaBar has now expanded to the search for signatures of new physics beyond the Standard Model, particularly through examination of flavor-changing neutral-current transitions, which proceed through diagrams involving virtual loops. These decays are suppressed in the Standard Model, increasing sensitivity to new-physics effects but decreasing branching fractions. Exploiting large and growing datasets, BaBar and Belle have made many measurements in loop decays where a b quark transitions to an s quark, observing hints of possible deviations from Standard Model expectations in CP-violating measurements.
Download or read book 2 written by and published by . This book was released on 1966 with total page 975 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dedham Library Scrapbook 1972 1980 written by and published by . This book was released on 1972 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of Branching Fractions and CP Violating Asymmetries in B0 to K0K0bar and B to K0barK Decays at the BaBar Experiment written by and published by . This book was released on 2007 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last few years, the B factories have established the Cabbibo-Kobayashi-Maskawa mechanism of CP violation in the Standard Model through the study of the decays of B mesons. The focus of Belle and BaBar has now expanded to the search for signatures of new physics beyond the Standard Model, particularly through examination of flavor-changing neutral-current transitions, which proceed through diagrams involving virtual loops. These decays are suppressed in the Standard Model, increasing sensitivity to new-physics effects but decreasing branching fractions. Exploiting large and growing datasets, BaBar and Belle have made many measurements in loop decays where a b quark transitions to an s quark, observing hints of possible deviations from Standard Model expectations in CP-violating measurements.
Download or read book Branching Fraction and CP Asymmetries OfB 0 to K 0 sK 0 sK 0 s written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present measurements of the branching fraction and time-dependent CP-violating asymmetries in B° → K{sub S}°K{sub S}°K{sub S}° decays based on 227 million [Upsilon](4S) → B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. They obtain a branching fraction of (6.9{sub -0.8}{sup +0.9} ± 0.6) x 10−6, and CP asymmetries C = -0.34{sub -0.25}{sup +0.28} ± 0.05 and S = -0.71{sub -0.32}{sup +0.38} ± 0.04, where the first uncertainties are statistical and the second systematic.
Download or read book A Measurement of the Branching Fractions and CP Asymmetries of the Decays B 2 K pi 0 and B 2 rho pi 0 at BaBar written by and published by . This book was released on 2005 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of the branching fractions (average over charge-conjugate decays), B, and CP violating asymmetries, ACP, of the decays B± → K*±[pi]0 and B± → [rho]±[pi]0 are presented.
Download or read book Measurement of Branching Fractions and CP Violating Asymmetries in B Rho h written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present measurements of branching fractions and CP-violating asymmetries in B[sup 0][yields][rho][sup[+-]][pi][sup[-+]] and B[sup 0][yields][rho][sup -]K[sup+] decays. The results are obtained from a data sample of 88.9 x 10[sup 6][Upsilon](4S)[yields] B[bar B] decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. From a time-dependent maximum likelihood fit we measure the charge-averaged branching fractions[Beta](B[sup 0][yields][rho][sup[+-]][pi][sup[-+]])= (22.6[+-] 1.8 (stat)[+-] 2.2 (syst)) x 10[sup -6] and[Beta](B[sup 0][yields][rho][sup -]K[sup+])= (7.3[sub -1.2][sup+1.3][+-] 1.3) x 10[sup -6]; and the CP-violating charge asymmetries A[sub CP][sup[rho][pi]]= -0.18[+-] 0.08[+-] 0.03 and A[sub CP][sup[rho]K]= 0.28[+-] 0.17[+-] 0.08; the direct CP violation parameter C[sub[rho][pi]]= 0.36[+-] 0.18[+-] 0.04 and the mixing-induced CP violation parameter S[sub[rho][pi]]= 0.19[+-] 0.24[+-] 0.03; and the dilution parameters[Delta]C[sub[rho][pi]]= 0.28[sub -0.19][sup+0.18][+-] 0.04 and[Delta]S[sub[rho][pi]]= 0.15[+-] 0.25[+-] 0.03.
Download or read book Measurement of CP Asymmetries and Branching Fractions in B0 Pi Pi B0 K Pi B0 Pi0 Pi0 B0 K0 Pi0 and Isospin Analysis of B Pi Pi Decays written by and published by . This book was released on 2008 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present preliminary results of improved measurements of the CP-violating asymmetries and branching fractions in the decays B° →??−, B° → K+?−, B° →?°?°, and B° → K°?°. This update includes all data taken at the?(4S) resonance by the BABAR experiment at the asymmetric PEP-II B-meson factory at SLAC, corresponding to 467 ± 5 million B{bar B} pairs. They find S{sub??} = -0.68 ± 0.10 ± 0.03, C{sub??} = -0.25 ± 0.08 ± 0.02,?{sub K{sub?}} = -0.107 ± 0.016{sub -0.004}, {sup +0.006}, C{sub?°?°} = -0.43 ± 0.26 ± 0.05,?(B° →?°?°) = (1.83 ± 0.21 ± 0.13) x 10−6,?(B° → K°?°) = (10.1 ± 0.6 ± 0.4) x 10−6, where the first error is statistical and the second is systematic. They observe CP violation with a significance of 6.7? in B° → {pi}− and 6.1? in B° → K+{pi}−. Constraints on the Unitarity Triangle angle? are determined from the isospin relation between all B → {pi}{pi} rates and asymmetries.
Download or read book Measurements of Branching Fractions Polarizations and Direct CP violation Asymmetries in B Rho0 K and B F0 980 K Decays written by and published by . This book was released on 2011 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present measurements of the branching fractions, longitudinal polarization, and direct CP-violation asymmetries for the decays B →?°K*+ and B+ f0(980)K*+ with a sample of (467 ± 5) x 106 B{bar B} pairs collected with the BABAR detector at the PEP-II asymmetric-energy e+e− collider at the SLAC National Accelerator Laboratory. We observe B+ →?°K*+ with a significance of 5.3? and measure the branching fraction?(B+ →?°K*+) = (4.6 ± 1.0 ± 0.4) x 10−6, the longitudinal polarization f{sub L} = 0.78 ± 0.12 ± 0.03, and the CP-violation asymmetry A{sub CP} = 0.31 ± 0.13 ± 0.03. We observe B+ → f0(980)K*+ and measure the branching fraction?(B+ → f0(980)K*+) x?(f0(980) →?+?−) = (4.2 ± 0.6 ± 0.3) x 10−6 and the CP-violation asymmetry A{sub CP} = -0.15 ± 0.12 ± 0.03. The first uncertainty quoted is statistical and the second is systematic.
Download or read book Branching Fractions and CP Violating Asymmetries in Radiative B Decays to Eta K Gamma written by and published by . This book was released on 2008 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present measurements of the CP-violation parameters S and C for the radiative decay B° →?K{sub S}°?; for B →?K? they also measure the branching fractions and for B →?K+? the time-integrated charge asymmetry?{sub ch}. The data, collected with the BABAR detector at the Stanford Linear Accelerator Center, represent 465 x 106 B{bar B} pairs produced in e+e− annihilation. The results are S = -0.18{sub -0.46}{sup +0.49} ± 0.12, C = -0.32{sub -0.39}{sup +0.40} ± 0.07,?(B° →?K°?) = (7.1{sub -2.0}{sup +2.1} ± 0.4) x 10−6,?(B+ →?K+?) = (7.7 ± 1.0 ± 0.4) x 10−6, and?{sub ch} = ( -9.0{sub -9.8}{sup +10.4} ± 1.4) x 10−2. The first error quoted is statistical and the second systematic.
Download or read book Measurement of CP Violation in B0 to K0 and of Branching Fraction and CP Violation in B0 u2192 F0 980 K 0 atop S written by and published by . This book was released on 2006 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors measure the time-dependent CP asymmetry parameters in B0 → K+K-K0 based on a data sample of approximately 277 million B-meson pairs recorded at the Y(4S) resonance with the BABAR detector at the PEP-II B-meson Factory at SLAC. They reconstruct two-body B0 decays to ?(1020)K$0top{S}$ and ?(1020)K$0top{L}$. Using a time-dependent maximum-likelihood fit, they measure sin2?eff(?K0) = 0.48 ± 0.28 ± 0.10, and C(?K0) = 0.16 ± 0.25 ± 0.09, where the first error is statistical, and the second is systematic. They also present measurements of the CP-violating asymmetries in the decay B0 → f0(→ ?+?-)K$0top{S}$. The results are obtained from a data sample of 209 x 106 Y(4S) → B$ar{B}$ decays, also collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. From a time-dependent maximum-likelihood fit they measure the mixing-induced CP violation parameter S(f0(980)K$0top{S}$) = - sin 2?efff0(980)K$0top{S}$ = -0.95$+0.32top{-0.23}$ ± 0.10 and the direct CP violation parameter C(f0(980)K$0top{S}$) = - 0.24 ± 0.31 ± 0.15, where the first errors are statistical and the second systematic. Finally, they present a measurement of the branching fraction of the decay B0 → f0(→ ?+?-)K$0top{S}$. From a time-dependent maximum likelihood fit to a data sample of 123 x 106 Y(4S) → B$ar{B}$ decays they find 93.6 ± 13.6 ± 6.4 signal events corresponding to a branching fraction of ?(B0 → f0(980)(→ ?+?-)K0) = (6.0 ± 0.9 ± 0.6 ± 1.2) x 10-6, where the first error is statistical, the second systematic, and the third due to model uncertainties.
Download or read book Measurements of CP Violating Asymmetries and BranchingFractions in B Decays to OmegaK and OmegaPi 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: We present measurements of CP-violating asymmetries and branching fractions for the decays B{sup +} {yields} {omega}{pi}{sup +}, B{sup +} {yields} {omega}K{sup +}, and B{sup 0} {yields} {omega}K{sup 0}. The data sample corresponds to 232 million B{bar B} pairs produced by e{sup +}e{sup -} annihilation at the {Upsilon}(4S) resonance. For the decay B{sup 0} {yields} {omega}K{sub s}{sup 0}, we measure the time-dependent CP-violation parameters S = 0.51{sub -0.39}{sup +0.35} {+-} 0.02, and C = -0.55{sub -0.26}{sup +0.28} {+-} 0.03. We also measure the branching fractions, in units of 10{sup -6}, {Beta}(B{sup +} {yields} {omega}{pi}{sup +}) = 6.1 {+-} 0.7 {+-} 0.4, {Beta}(B{sup +} {yields} {omega}K{sup +}) = 6.1 {+-} 0.6 {+-} 0.4, and {Beta}(B{sup 0} {yields} {omega}K{sup 0}) = 6.2 {+-} 1.0 {+-} 0.4, and charge asymmetries {Alpha}{sub ch}(B{sup +} {yields} {omega}{pi}{sup +}) = -0.01 {+-} 0.10 {+-} 0.01 and {Alpha}{sub ch}(B{sup +} {yields} {omega}K{sup +}) = 0.05 {+-} 0.09 {+-} 0.01.
Download or read book Measurements of the Branching Fraction and CP Violation Asymmetries in B0 f0 980 Ks written by and published by . This book was released on 2004 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present measurements of the branching fraction and CP-violating asymmetries in the decay B° → f0(980)K{sub S}°. The results are obtained from a data sample of 123 x 106?(4S) → B{bar B} decays. From a time-dependent maximum likelihood fit they measure the branching fraction?(B° → f0(980)(→??°)K°) = (6.0 ± 0.9 ± 0.6 ± 1.2) x 10−6, the mixing-induced CP violation parameter S = 1.62{sub -0.51}{sup +0.56} ± 0.09 ± 0.04 and the direct CP violation parameter C = 0.27 ± 0.36 ± 0.10 ± 0.07, where the first errors are statistical, the second systematic and the third due to model uncertainties. They measure the f0(980) mass and width to be m{sub f{sub 0(980)}} = (980.6 ± 4.1 ± 0.5 ± 4.0) MeV/c2 and?{sub f{sub 0(980)}} = (43−9{sup +12} ± 3 ± 9) MeV/c2, respectively.
Download or read book Measurement of the Branching Fractions and CP Violating Asymmetries of Charmless Hadronic B Decays K pi at BaBar written by Nicole Isabelle Chevalier 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 the Branching Fraction and Time Dependent CP Asymmetries of B0 to J Psi Pi0 Decays written by K. George and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present measurements of the branching fraction and time-dependent CP asymmetries in B{sup 0} {yields} J/{psi}{pi}{sup 0} decays based on (231.8 {+-} 2.6) x 10{sup 6} {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the SLAC PEP-II asymmetric-energy B factory. We obtain a branching fraction {Beta}(B{sup 0} {yields} J/{psi}{pi}{sup 0}) = (1.94 {+-} 0.22 (stat) {+-} 0.17 (syst)) x 10{sup -5}. We also measure the CP asymmetry parameters C = -0.21 {+-} 0.26 (stat) {+-} 0.06 (syst) and S = -0.68 {+-} 0.30 (stat) {+-} 0.04 (syst).
Download or read book Measurement of CP Violation in B0 to Phi K0 and of Branching Fraction and CP Violation in B0 2 F0 980 K 0 atop S written by and published by . This book was released on 2006 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors measure the time-dependent CP asymmetry parameters in B0 2!K+K-K0 based on a data sample of approximately 277 million B-meson pairs recorded at the Y(4S) resonance with the BABAR detector at the PEP-II B-meson Factory at SLAC. They reconstruct two-body B0 decays to [Phi](1020)K$0\atop{S}$ and [Phi](1020)K$0\atop{L}$. Using a time-dependent maximum-likelihood fit, they measure sin2[beta]eff([Phi]K0) = 0.48 ± 0.28 ± 0.10, and C([Phi]K0) = 0.16 ± 0.25 ± 0.09, where the first error is statistical, and the second is systematic. They also present measurements of the CP-violating asymmetries in the decay B0 2!f0(2![pi]+[pi]- )K$0\atop{S}$. The results are obtained from a data sample of 209 x 106 Y(4S) 2!B$\bar{B}$ decays, also collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. From a time-dependent maximum-likelihood fit they measure the mixing-induced CP violation parameter S(f0(980)K$0\atop{S}$) = - sin 2[beta]efff0(980)K$0\atop{S}$ = -0.95$+0.32\atop{-0.23}$ ± 0.10 and the direct CP violation parameter C(f0(980)K$0\atop{S}$) = - 0.24 ± 0.31 ± 0.15, where the first errors are statistical and the second systematic. Finally, they present a measurement of the branching fraction of the decay B0 2!f0(2![pi]+[pi]- )K$0\atop{S}$. From a time-dependent maximum likelihood fit to a data sample of 123 x 106 Y(4S) 2!B$\bar{B}$ decays they find 93.6 ± 13.6 ± 6.4 signal events corresponding to a branching fraction of [beta](B0 2!f0(980)(2![pi]+[pi]- )K0) = (6.0 ± 0.9 ± 0.6 ± 1.2) x 10-6, where the first error is statistical, the second systematic, and the third due to model uncertainties.
Download or read book Measurements of CP Violating Asymmetries in the Decay B0 to K K K0 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 analyze the decay B° 2!KK−K° using 383 million B{bar B} events collected by the BABAR detector at SLAC to extract CP violation parameter values over the Dalitz plot. Combining all KK−K° events, they find A{sub CP} = -0.015 ± 0.077 ± 0.053 and [beta]{sub eff} = 0.352 ± 0.076 ± 0.026 rad, corresponding to a CP violation significance of 4.8[sigma]. A second solution near [pi]/2 - [beta]{sub eff} is disfavored with a significance of 4.5[sigma]. They also report A{sub CP} and [beta]{sub eff} separately for decays to [phi](1020)K°, f0(980)K°, and K+K−K° with m{sub K{sup +}K−}> 1.1 GeV/c2.
