Measurement Of Branching Fractions And Cp Violating Asymmetries In B0 To K0k0bar And B To K0bark Decays At The Babar Experiment

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Measurement Of Branching Fractions And Cp Violating Asymmetries In B0 To K0k0bar And B To K0bark Decays At The Babar Experiment

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Author :
language : en
Publisher:
Release Date : 2007

Measurement Of Branching Fractions And Cp Violating Asymmetries In B0 To K0k0bar And B To K0bark Decays At The Babar Experiment written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.

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.

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

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Author :
language : en
Publisher:
Release Date : 2007

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 has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.

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.

Branching Fraction And Direct Cp Violating Asymmetries In Charmless Twobody B Decays At Babar

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Author : W. D. Hulsbergen
language : en
Publisher:
Release Date : 2005

Branching Fraction And Direct Cp Violating Asymmetries In Charmless Twobody B Decays At Babar written by W. D. Hulsbergen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.

We present preliminary measurements of branching fractions and direct CP violating asymmetries in charmless two-body B decays, obtained with the BABAR detector using a sample of 227M {Upsilon}(4S) {yields} B{bar B} decays. We report the first observation of B{sup 0} {yields} K{sup 0}{bar K}{sup 0} and the first observation of direct CP violation in B{sup 0} {yields} K{sup +}{pi}{sup -} decays.

Evidence For B To K0bark And B0 To K0k0bar And Measurement Of The Branching Fraction And Search For Direct Cp Violation In B To K0pi

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Author :
language : en
Publisher:
Release Date : 2005

Evidence For B To K0bark And B0 To K0k0bar And Measurement Of The Branching Fraction And Search For Direct Cp Violation In B To K0pi written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.

The authors present evidence for the b 2!d penguin-dominated decays B 2!{bar K}°K and B° 2!K°{bar K}° with significances of 3.5 and 4.5 standard deviations, respectively. The results are based on a sample of 227 million [Upsilon](4S) 2!B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e− collider at SLAC. We measure the branching fractions [Beta](B+ 2!{bar K}°K+) = (1.5 ± 0.5 ± 0.1) x 10−6 (

Dedham Library Scrapbook 1972 1980

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Author :
language : en
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Release Date : 1972

Dedham Library Scrapbook 1972 1980 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with Libraries categories.

Measurements Of Branching Fractions And Cp Violating Asymmetries In B0 Pi Pi K Pi K K Decays

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Author :
language : en
Publisher:
Release Date : 2003

Measurements Of Branching Fractions And Cp Violating Asymmetries In B0 Pi Pi K Pi K K Decays written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.

We present measurements of branching fractions and CP-violating asymmetries for neutral B meson decays to two-body final states of charged pions and kaons. The results are obtained from a data sample of about 88 million[Upsilon](4S)[yields] B[bar B] decays collected between 1999 and 2002 with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. From a time-independent fit we measure the charge-averaged branching fractions[Beta](B[sup 0][yields][pi][sup+][pi][sup -])= (4.7[+-] 0.6[+-] 0.2) x 10[sup -6] and[Beta](B[sup 0][yields] K[sup+][pi][sup -])= (17.9[+-] 0.9[+-] 0.7) x 10[sup -6], where the first uncertainty is statistical and the second is systematic; the 90% confidence level upper limit[Beta](B[sup 0][yields] K[sup+]K[sup -])

Measurement Of Branching Fractions And Cp Violating Asymmetries In B Rho H

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Author :
language : en
Publisher:
Release Date : 2003

Measurement Of Branching Fractions And Cp Violating Asymmetries In B Rho H written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.

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.

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

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Author :
language : en
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Release Date : 2008

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 has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.

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.

Measurement Of The Branching Fraction And The Cp Violating Asymmetry For The Decay B0 To K0s Pi0

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Author :
language : en
Publisher:
Release Date : 2005

Measurement Of The Branching Fraction And The Cp Violating Asymmetry For The Decay B0 To K0s Pi0 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.

The authors measure the branching fraction and the CP-violating asymmetry of B° 2!K{sub S}°[pi]° decays with 227 million [Upsilon](4S) 2!B{bar B} events collected with the BABAR detector at the PEP-II asymmetric-energy ee− collider at SLAC. They obtain a branching fraction [Beta](B° 2!K°[pi]°) = (11.4 ± 0.9 ± 0.6) x 10−6 and CP-violating asymmetry parameters C{sub K{sub S}°[pi]°} = 0.06 ± 0.18 ± 0.03 and S{sub K{sub S}°[pi]°} = 0.35{sub -0.33}{sup +0.30} ± 0.04, where the first error is statistical and the second systematic.

Measurement Of The Branching Fraction And Cp Violating Asymmetries In Neutral B Decays To D Sup D Sup

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language : en
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Release Date : 2003

Measurement Of The Branching Fraction And Cp Violating Asymmetries In Neutral B Decays To D Sup D Sup written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.

The authors present measurements of the branching fraction and CP-violating asymmetries for neutral B decays to D*{sup ±} D{sup {-+}}. The measurement uses a data sample for approximately 88 million [Upsilon](4S) 2!B{bar B} decays collected with the BABAR detector at the SLAC PEP-II asymmetric-energy B factory. They measure the branching fraction to be (8.8 ± 1.0 ± 1.3) x 10−4 and the time-integrated CP-violating asymmetry between the rates to D*− D and D* D− to be [Alpha] = -0.03 ± 0.11 ± 0.05. They also measure the time-dependent CP-violating asymmetry parameters to be S{sub -+} = -0.24 ± 0.69 ± 0.12, C{sub -+} = -0.22 ± 0.37 ± 0.10 for B 2!D*− D+ and S{sub +-} = -0.82 ± 0.75 ± 0.14, C{sub +-} = -0.47 ± 0.40 {+-} 0.12 for B 2!D*+ D−. In each case the first error is statistical and the second error is systematic.