Improved Measurement Of Cp Asymmetries In B0 To Ccbar K0 Decays

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Improved Measurement Of Cp Asymmetries In B0 To Ccbar K0 Decays

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Author :
language : en
Publisher:
Release Date : 2005

Improved Measurement Of Cp Asymmetries In B0 To Ccbar K0 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 2005 with categories.

We present results on time-dependent CP asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 227 x 106 [Upsilon](4S) → B{bar B} decays collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. The amplitude of the CP asymmetry, sin2[beta] in the Standard Model, is derived from decay-time distributions from events in which one neutral B meson is fully reconstructed in a final state containing a charmonium meson and the other B meson is determined to be either a B° or {bar B}° from its decay products. We measure sin2[beta] = 0.722 ± 0.040(stat) ± 0.023(syst) in agreement with the Standard Model expectation.

Dissertation Abstracts International

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Author :
language : en
Publisher:
Release Date : 2002

Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Dissertations, Academic categories.

Measurement Of Time Dependent Cp Asymmetry In B0 Ccbar K 0 Decays

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Author :
language : en
Publisher:
Release Date : 2009

Measurement Of Time Dependent Cp Asymmetry In B0 Ccbar K 0 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 2009 with categories.

The authors present updated measurements of time-dependent Cp asymmetries in fully reconstructed neutral B decays containing a charmonium meson. The measurements reported here use a data sample of (465 ± 5) x 106 [Upsilon](4S) 2!B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric energy ee− storage rings operating at the SLAC National Accelerator Laboratory. The time-dependent CP asymmetry parameters measured from J/[psi] K{sub S}°, J/[psi]K{sub L}°, [psi](2S)K{sub S}°, [eta]{sub c}K{sub S}°, [chi]{sub c1}K{sub S}° and J/[psi] K*(892)° decays are: C{sub f} = 0.024 ± 0.020(stat) ± 0.016(syst) and -[eta]{sub f}S{sub f} = 0.687 ± 0.028(stat) ± 0.012(syst).

New Measurements Of Cp Violation In B0 To Ccbar K 0 Decays From Babar

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Author :
language : en
Publisher:
Release Date : 2005

New Measurements Of Cp Violation In B0 To Ccbar K 0 Decays From Babar 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.

We present new measurements of CP asymmetries in B° → (c{bar c})K{sup 0(*)} decays recorded by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC between 1999 and 2004. We determine sin2[beta] from decay-time distributions of 7730 signal events in a data sample of approximately 227 x 106 [Upsilon](4S) → B{bar B} decays. The measured value of sin2[beta] = 0.722 ± 0.040(stat) ± 0.023(syst) is in agreement with the value expected from the Standard Model. In a separate time-dependent angular analysis of B → J/[psi] K*° (K*° → K{sub S}°[pi]°) decays we measure cos 2[beta] to be positive at 86% CL.

Improved Measurement Of Cp Observables In B To D0 Cp K Decays

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Author :
language : en
Publisher:
Release Date : 2008

Improved Measurement Of Cp Observables In B To D0 Cp 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 2008 with categories.

We present a study of the decay B− 2!D{sub (CP)}°K− and its charge conjugate, where D{sub (CP)}° is reconstructed in both a non-CP flavor eigenstate and in CP (CP-even and CP-odd) eigenstates, based on a sample of 382 million [Upsilon](4S) 2!B{bar B} decays collected with the BABAR detector at the PEP-II ee− storage ring. We measure the direct CP asymmetries A{sub CP±} and the ratios of the branching fractions R{sub CP±}: A{sub CP+} = 0.27 ± 0.09(stat) ± 0.04(syst), A{sub CP-} = -0.09 ± 0.09(stat) ± 0.02(syst), R{sub CP+} = 1.06 ± 0.10(stat) ± 0.05(syst), R{sub CP-} = 1.03 {+-} 0.10(stat) {+-} 0.05(syst). These results will help to better constrain the gamma phase parameter of the Cabibbo-Kobayashi-Maskawa quark mixing matrix.

Improved Measurement Of Cp Violation In Neutral Bdecays To Ccbar S

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Author :
language : en
Publisher:
Release Date : 2007

Improved Measurement Of Cp Violation In Neutral Bdecays To Ccbar S 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.

The authors present updated measurements of time-dependent CP asymmetries in fully-reconstructed neutral B decays to several CP eigenstates containing a charmonium meson. The measurements use a data sample of (383 ± 4) x 106 [Upsilon](4S) → B{bar B} decays collected with the BABAR detector at the PEP-II B factory. They determine sin2[beta] = 0.714 ± 0.032(stat) ± 0.018(syst) and.

Measurement Of Cp Asymmetries In B0 To Phi K0 And B0 To K K Ks Decays

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Author :
language : en
Publisher:
Release Date : 2005

Measurement Of Cp Asymmetries In B0 To Phi K0 And B0 To K K Ks 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 2005 with categories.

We measure the time-dependent CP asymmetry parameters in B° 2!KK−K° based on a data sample of approximately 227 million B-meson pairs recorded at the [Upsilon](4S) resonance with the BABAR detector at the PEP-II B-meson Factory at SLAC. We reconstruct two-body B° decays to [phi](1020)K{sub s}° and [phi](1020)K{sub L}°, and the three-body decay KK−K{sub s}° with [phi](1020)K{sub s}° excluded. For the B° 2![phi]K° decays, they measure sin 2[beta]{sub eff}([phi]K°) = +0.50 ± 0.25(stat){sub -0.04}{sup +0.07}(syst). The B° 2!K+K−K{sub s}° decays are dominated by K+K− S-wave, as determined from an angular analysis; they measure sin 2[beta]{sub eff} (K+K−K{sub s}°) = +0.55 ± 0.22(stat) ± 0.04(syst) ± 0.11(CP), where the last error is due to the uncertainty in the fraction of CP-even contributions to the decay amplitude. We find no evidence for direct CP violation.

The Measurement Of Cp Asymmetries In The Three Body Charmless Decay Neutral B Meson Decays To Neutral Kaon S Neutral Kaon S Neutral Kaon S

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Author : Haleh K. Hadavand
language : en
Publisher:
Release Date : 2006

The Measurement Of Cp Asymmetries In The Three Body Charmless Decay Neutral B Meson Decays To Neutral Kaon S Neutral Kaon S Neutral Kaon S written by Haleh K. Hadavand 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 this dissertation, a measurement of CP-violating effects in decays of neutral B mesons is presented. The data sample for this measurement consists of about 272 million {Upsilon}(4S) {yields} B{bar B} decays collected between 1999 and 2004 with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider, located at the Stanford Linear Accelerator Center. One neutral B meson is fully reconstructed in the CP eigenstate B{sup 0} {yields} K{sub S}{sup 0} K{sub S}{sup 0} K{sub S}{sup 0}. The other B meson is determined to be either a B{sup 0} or a {bar B}{sup 0}, at the time of its decay, from the properties of its decay products. The proper time {Delta}t elapsed between the decay of the two mesons is determined by reconstructing their decay vertices, and by measuring the distance between them. A novel technique for determining the B vertex of the decay to the CP eigenstate B{sup 0} {yields} K{sub S}{sup 0} K{sub S}{sup 0} K{sub S}{sup 0} has been applied since the tracks in the final state do not originate from the B decay vertex. The time-dependent CP asymmetry amplitudes are determined by the distributions of {Delta}t in events with a reconstructed B meson in the CP eigenstate. The detector resolution and the b flavor tagging parameters are constrained by the {Delta}t distributions of events with a fully reconstructed flavor eigenstate. Because of the special topology of this decay, the detector resolution on {Delta}t must be checked for consistency with decays with tracks which originate from the B decay. From a maximum likelihood fit to the {Delta}t distributions of all selected events, the value of the CP violating asymmetries are measured to be S{sub 3K{sub S}{sup 0}} = -0.71{sub -0.32}{sup +0.38} {+-} 0.04 and C{sub 3K{sub S}{sup 0}} = -0.34{sub -0.25}{sup +0.28} {+-} 0.05. Fixing C = 0 we measure the time-dependent CP asymmetry amplitude sin 2{beta} = -S{sub 3K{sub S}{sup 0}} = 0.79{sub -0.36}{sup +0.39} {+-} 0.04. The value of sin 2{beta} is in agreement with Standard Model predictions.

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
Publisher:
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 Cp Asymmetry In B0 F0 K0 S B0 Phi K0 And B0 K K K0 S Decays

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Author : Paul E. Kutter
language : en
Publisher:
Release Date : 2006

Measurement Of Cp Asymmetry In B0 F0 K0 S B0 Phi K0 And B0 K K K0 S Decays written by Paul E. Kutter 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 present results on time-dependent CP asymmetries in f{sub 0}(980)({yields} {pi}{sup +}{pi}{sup -})K{sub S}{sup 0} and B{sup 0} {yields} K{sup +}K{sup -}K{sup 0}. The measurements use a data sample consisting of approximately 209(f{sub 0}(980)({yields} {pi}{sup +}{pi}{sup -})K{sub S}{sup 0}) and 227(B{sup 0} {yields} K{sup +}K{sup -}K{sup 0}) million B-meson pairs recorded at the {Upsilon}(4S) resonance with the BABAR detector at the PEP-II B-meson Factory at SLAC.