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Observation of the Rare Decay B0 to K0(s)K+-pi-+.

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Page : 8 pages

File Size : 49,85 MB

Release : 2010

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We report an analysis of charmless hadronic decays of neutral B mesons to the final state K{sub S}°K{sup ±}?{sup ∓}, using a data sample of (465 ± 5) x 106 B{bar B} events collected with the BABAR detector at the ?(4S) resonance. We observe an excess of signal events with a significance of 5.2 standard deviations including systematic uncertainties and measure the branching fraction to be ?(B° → K{sub S}°K{sup ±}?{sup ∓}) = (3.2 ± 0.5 ± 0.3) x 10−6, where the uncertainties are statistical and systematic, respectively.



Observation of the Rare Decay B0 --] Ks K /- Pi-

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Page : 8 pages

File Size : 48,3 MB

Release : 2010

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We report an analysis of charmless hadronic decays of neutral B mesons to the final state K{sub S}°K{sup ±}[pi]{sup {-+}}, using a data sample of (465 ± 5) x 106 B{bar B} events collected with the BABAR detector at the [Upsilon](4S) resonance. We observe an excess of signal events with a significance of 5.2 standard deviations including systematic uncertainties and measure the branching fraction to be [Beta](B° → K{sub S}°K{sup ±}[pi]{sup {-+}}) = (3.2 {+-} 0.5 {+-} 0.3) x 10−6, where the uncertainties are statistical and systematic, respectively.



Observation of the Rare Decay B+ \to K+pi0pi0 and Measurement of the Quasi-two Body Contributions B+ \to K*(892)+pi0, B+ \to F0(980)K+ and B+ \to Chic0K+.

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Page : 11 pages

File Size : 30,58 MB

Release : 2011

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We report an analysis of charmless hadronic decays of charged B mesons to the final state K+?°?°, using a data sample of (470.9 ± 2.8) x 106 B{bar B} events collected with the BABAR detector at the ?(4S) resonance. We observe an excess of signal events, with a significance above 10 standard deviations including systematic uncertainties, and measure the branching fraction and CP asymmetry to be ?(B+ → K+?°?°) = (16.2 ± 1.2 ± 1.5) x 10−6 and A{sub CP}(B+ → K+?°?°) = -0.06 ± 0.06 ± 0.04, where the uncertainties are statistical and systematic, respectively. Additionally, we study the contributions of the B+ → K+(892)+?°, B+ → f0(980)K+, and B+ → ?{sub c0}K+ quasi-two-body decays. We report the world's best measurements of the branching fraction and CP asymmetry of the B+ → K+?°?° and B+ → K+(892)+?° channels.



Observation of the Three-body Rare Decay B-] J/psi Phi K.

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Page : 19 pages

File Size : 38,17 MB

Release : 2010

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The authors report the study of the B meson decays B{sup ±} 2!J/[psi][phi]K{sup ±}, B° 2!J/[psi][phi]K° using 433 million of B{bar B} events collected at the [Upsilon](4S) resonance with the BABAR detector at the PEP-II ee− asymmetric-energy collider. They obtain the branching fraction measurements: [Beta](B{sup ±} 2!J[psi][phi]K{sup ±}) = (5.6 {+-} 0.9(stat) {+-} 0.3(sys)) x 10−5, [Beta](B{sup {+-}} 2!J[psi][phi]K°) = (5.4 {+-} 1.2(stat) {+-} 0.4(sys)) x 10−5.



Observation of the Rare Decay B+̂ to K+̂ \pi0̂ \pi0̂

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Page : 8 pages

File Size : 19,48 MB

Release : 2010

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We report an analysis of charmless hadronic decays of charged B mesons to the final state K?°?°, using a data sample of 470.9 ± 2.8 million B{bar B} events collected with the BABAR detector at the?(4S) resonance. We observe an excess of signal events with a significance above 10 standard deviations including systematic uncertainties and measure the branching fraction to be?(B+??2192?K+?°?°) = (15.5 ± 1.1 ± 1.6) x 10−6, where the uncertainties are statistical and systematic, respectively.



The Search for the Rare Decay B to A0+pi0

Author : W. Vazquez

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Page : 17 pages

File Size : 40,87 MB

Release : 2006

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A search for the decay B{+-} {yields} a{sub 0}{sup {+-}}{pi}{sup 0} with the a{sub 0}{sup +} decaying to an {eta} and a {pi}{sup +} was carried out at the Stanford Linear Accelerator Center using the BABAR detector coupled with the PEP-II collider. The analysis used a data sample comprised of approximately 252 million B{bar B} pairs collected at the {Upsilon}(4S) resonance. No signal was observed and a 90% confidence level upper limit on the branching fraction was set at 1.32 x 10{sup -6}.



Study of the Rare Decay B0 to Pi0 Pi0 at BaBar

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Page : 5 pages

File Size : 25,88 MB

Release : 2003

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The BABAR experiment operating at the PEP-II ee− collider is designed to study CP violation effects in the B-meson system. From May 1999 to June 2002 approximately 81 fb−1 of data have been collected at the [Upsilon](4S) resonance, containing (87.9 ± 1.4) Million BB pairs. From this data sample the branching fraction for the decay B° 2![pi]°[pi]° has been extracted using a multi-dimensional maximum likelihood technique. With an efficiency of 20.4%, we find 3614−1{sup +15+1} B° 2![pi]°[pi]° events and measure the branching fraction to be [Beta](B° 2![pi]°[pi]°) = (2.0{sub -0.8-0.2}{sup +0.9+0.3}) x 10−6 where the first error is statistical and the second systematic. The statistical significance is 3.1[sigma] and we report an upper limit of [Beta](B° 2![pi]°[pi]°)





Observation of the Decay B0-]rho+rho- and Measurement of the Branching Fraction and Polarization

Author : B. Aubert

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Page : 8 pages

File Size : 28,73 MB

Release : 2003

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The authors have observed the rare decay B{sup 0} {yields} {rho}{sup +}{rho}{sup -} in a sample of 89 million B{bar B} pairs recorded with the BABAR detector. The number of observed events is 88{sub -21}{sup +23} {+-} 9, with a significance of 5.1 standard deviations with systematic uncertainties included. The branching fraction and the longitudinal polarization are measured to be {Beta}(B{sup 0} {yields} {rho}{sup +}{rho}{sup -}) = (25{sub -6-6}{sup +7+5}) x 10{sup -6} and {Lambda}{sub L}/{Lambda} = 0.98{sub -0.08}{sup +0.02} {+-} 0.03, respectively.



First Observation of the Charmless Decay B to K [pi]0[pi]0 and Study of Its Dalitz Plot Structure

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Page : 201 pages

File Size : 43,41 MB

Release : 2012

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Results for the first measurement of the inclusive branching and CP asymmetry of the charmless 3-body decay B+ → K+[pi]0[pi]0 are presented. The analysis uses a data sample with an integrated luminosity of 429.0 fb-1, recorded by the BABAR detector at the PEP-II asymmetric B Factory. This sample corresponds to 470.9 ±} 2.8 million B$\bar{B}$ pairs. Measurements of the branching fractions (B) and CP asymmetries (ACP) of some of the intermediate resonances in the K+[pi]0[pi]0 Dalitz plot are also presented.