Measurement Of The Branching Fraction Polarization And Cp Asymmetries In B0 Rho0rho0 Decay And Implications For The Ckm Angle Alpha

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Measurement Of The Branching Fraction Polarization And Cp Asymmetries In B0 Rho0rho0 Decay And Implications For The Ckm Angle Alpha

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Author :
language : en
Publisher:
Release Date : 2008

Measurement Of The Branching Fraction Polarization And Cp Asymmetries In B0 Rho0rho0 Decay And Implications For The Ckm Angle Alpha 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.

We study B° 2![rho]°[rho]° decays in a sample of 465 x 106 [Upsilon](4S) 2!B{bar B} events collected with the BABAR detector at the PEP-II asymmetric-energy ee− collider located at the Stanford Linear Accelerator Center (SLAC). We measure the branching fraction [Beta] = (0.92 ± 0.32 ± 0.14) x 10−6 and longitudinal polarization fraction f{sub L} = 0.75{sub -0.14}{sup +0.11} ± 0.04, where the first uncertainty is statistical and the second is systematic. The evidence for the B° 2![rho]°[rho]° signal has a significance of 3.1 standard deviations, including systematic uncertainties. We investigate the proper-time dependence of the longitudinal component in the decay and measure the CP-violating coefficients S{sub L}°° = (0.3 ± 0.7 ± 0.2) and C{sub L}°° = (0.2 ± 0.8 ± 0.3). They study the implication of these results for the unitarity triangle angle [alpha].

Limit On The B0 To Rho0rho0 Branching Fraction And Implications For The Ckm Angle Alpha

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Author :
language : en
Publisher:
Release Date : 2005

Limit On The B0 To Rho0rho0 Branching Fraction And Implications For The Ckm Angle Alpha 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 search for the decay B° 2![rho]°[rho]° in a data sample of about 227 million [Upsilon](4S) 2!B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy ee− collider at SLAC. They find no significant signal and set an upper limit of 1.1 x 10−6 at 90% CL on the branching fraction. As a result, the uncertainty due to penguin contributions on the CKM unitarity angle [alpha] measured in B 2![rho][rho] decays is 11{sup o} at 68% CL.

Polarization And Cp Violation Measurements

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Author : Michael Prim
language : en
Publisher: Springer Science & Business Media
Release Date : 2014-03-28

Polarization And Cp Violation Measurements written by Michael Prim and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-03-28 with Science categories.

This thesis describes the thorough analysis of the rare B meson decay into φ K* on data taken by the Belle Collaboration at the B-meson-factory KEKB over 10 years. This reaction is very interesting, because it in principle allows the observation of CP-violation effects. In the Standard Model however, no CP violation in this reaction is expected. An observation of CP asymmetries thus immediately implies new physics. This thesis presents an amplitude analysis of this decay and the search for CP violation in detail and discusses methods to solve related problems: The quantification of multivariate dependence and the improvement of numeric evaluation speed of normalization integrals in amplitude analysis. In addition it provides an overview of the theory, experimental setup, (blind) statistical data analysis and estimation of systematic uncertainties.

Constraints On The Ckm Angle Alpha In The B To Rho Rho Decays

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Author : H. Li
language : en
Publisher:
Release Date : 2004

Constraints On The Ckm Angle Alpha In The B To Rho Rho Decays written by H. Li and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.

Using a data sample of 122 million {Upsilon}(4S) {yields} B{bar B} decays collected with BABAR detector at the PEP-II asymmetric B factory at SLAC, we measure the time-dependent-asymmetry parameters of the longitudinally polarized component in the B{sup 0} {yields} {rho}{sup +}{rho}{sup -} decay as C{sub L} = -0.23 {+-} 0.24(stat) {+-} 0.14(syst) and S{sub L} = -0.19 {+-} 0.33(stat) {+-} 0.11(syst). The B{sup 0} {yields} {rho}{sup 0}{rho}{sup 0} decay mode is also searched for in a data sample of about 227 million B{bar B} pairs. No significant signal is observed, and an upper limit of 1.1 x 10{sup -6} (90% C.L.) on the branching fraction is set. The penguin contribution to the CKM angle {alpha} uncertainty is measured to be 11{sup o}. All results are preliminary.

Measurements Of Branching Fractions Polarizations And Direct Cp Violation Asymmetries In B Rho0 K And B F0 980 K Decays

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Author :
language : en
Publisher:
Release Date : 2011

Measurements Of Branching Fractions Polarizations And Direct Cp Violation Asymmetries In B Rho0 K And B F0 980 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 2011 with categories.

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.

Measurements Of Branching Fraction Polarization And Direct Cp Violating Asymmetry In B Sup K Sup 0 Rho Sup Decays

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Author :
language : en
Publisher:
Release Date : 2004

Measurements Of Branching Fraction Polarization And Direct Cp Violating Asymmetry In B Sup K Sup 0 Rho Sup 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 2004 with categories.

The purpose of this analysis is the simultaneous measurement of the branching fraction, the longitudinal-polarization component, and the direct-CP-violating charge asymmetry for the B --> vector-vector decay mode B[sup +] --> K*[sup 0][rho][sup +], which has previously not been seen experimentally. The measurement of the polarization of the penguin decay is of special interest. There is no tree contribution to the decay amplitude and only a very small annihilation process. The polarization of the B[sup +] --> K*[sup 0][rho][sup +] decay mode can be compared to that already measured for the similar penguin decay B --> K*[phi].

Measurements Of Branching Fraction Ratios And Cp Asymmetries In Suppressed B 2 D 2 K Pi K And B 2 D 2 K Pi Pi Decays

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Author :
language : en
Publisher:
Release Date : 2011

Measurements Of Branching Fraction Ratios And Cp Asymmetries In Suppressed B 2 D 2 K Pi K And B 2 D 2 K 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 2011 with categories.

We report the first reconstruction in hadron collisions of the suppressed decays B-2!D(2!K+[pi]- )K- and B-2!D(2!K+[pi]- )[pi]- decays, sensitive to the CKM phase [gamma], using data from 7 fb-1 of integrated luminosity collected by the CDF II detector at the Tevatron collider. We reconstruct a signal for the B-2!D(2!K+[pi]- )K- suppressed mode with a significance of 3.2 standard deviations, and measure the ratios of the suppressed to favored branching fractions R(K) = [22.0 " 8.6(stat) " 2.6(syst)] x 10-3, R+(K) = [42.6 " 13.7(stat) " 2.8(syst)] x 10-3, R-(K) = [3.8 " 10.3(stat) " 2.7(syst)] x 10-3 as well as the direct CP-violating asymmetry A(K) = -0.82"0.44(stat)"0.09(syst) of this mode. Corresponding quantities for B- 2!D(2!K+[pi]- )[pi]- decay are also reported.

Measurement Of Cp Asymmetries For The Decays B D 0 Cp K

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Author : J. C. Chen
language : en
Publisher:
Release Date : 2005

Measurement Of Cp Asymmetries For The Decays B D 0 Cp K written by J. C. Chen 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.

Using a sample of 232 million {Upsilon}(4S) {yields} B{bar B} events collected with the BABAR detector at the PEP-II B Factory in 1999-2004, they study B{sup -} {yields} K{sup 0}K*(892){sup -} decays where K*{sup -} {yields} K{sub S}{sup 0} {pi}{sup -} and D{sup 0} {yields} K{sup -}{pi}{sup +}, K{sup -}{pi}{sup +}{pi}{sup 0}, K{sup -}{pi}{sup +}{pi}{sup +}{pi}{sup -} (non-CP final states); K{sup +}K{sup -}, {pi}{sup +}{pi}{sup -} (CP+ eigenstates); K{sub S}{sup 0}{pi}{sup 0}, K{sub S}{sup 0}{phi} and K{sub S}{sup 0}{omega} (CP- eigenstates). They measure four observables that are sensitive to the angle {gamma} of the CKM unitarity triangle; the partial-rate charge asymmetries A{sub CP{+-}} and the ratios of the B-decay branching fraction in CP{+-} and non-CP decays R{sub CP{+-}}: A{sub CP+} = -0.08 {+-} 0.19 (stat.) {+-} 0.08 (syst.); A{sub CP-} = -0.26 {+-} 0.40 (stat.) {+-} 0.12 (syst.); R{sub CP+} = 1.96 {+-} 0.40 (stat.) {+-} 0.11 (syst.); R{sub CP-} = 0.65 {+-} 0.26 (stat.) {+-} 0.08 (syst.).

Measurements Of Branching Fractions Polarizations And Direct Cp Violation Asymmetries In B To Rho K And B To F0 980 K Decays

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Author : B. Aubert
language : en
Publisher:
Release Date : 2006

Measurements Of Branching Fractions Polarizations And Direct Cp Violation Asymmetries In B To Rho K And B To F0 980 K Decays written by B. Aubert and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.

The authors report searches for B-meson decays to the charmless final states {rho}K* and f{sub 0}(980)K* with a sample of 232 million B{bar B} pairs collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at SLAC.

Measurement Of Branching Fractions And Cp Violatingcharge Asymmetries For B Meson Decays To D D And Implications For The Ckmangle Gamma

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Author :
language : en
Publisher:
Release Date : 2006

Measurement Of Branching Fractions And Cp Violatingcharge Asymmetries For B Meson Decays To D D And Implications For The Ckmangle Gamma written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.

In summary, the authors have measured branching fractions, upper limits, and charge asymmetries for all B meson decays to D{sup (*)} {bar D}{sup (*)}.