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Measurement of Time-Dependent CP Asymmetry in B0-]ccbar K(*)0 Decays

Measurement of Time-Dependent CP Asymmetry in B0-]ccbar K(*)0 Decays
Author:
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Total Pages: 15
Release: 2009
Genre:
ISBN:

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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).


Improved Measurement of CP Asymmetries in B0 to (ccbar)K0(*) Decays

Improved Measurement of CP Asymmetries in B0 to (ccbar)K0(*) Decays
Author:
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Total Pages:
Release: 2005
Genre:
ISBN:

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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.


Measurement of Time-dependent CP Asymmetries in B^0 --] K^0_s K^0_s K^0_s Decays

Measurement of Time-dependent CP Asymmetries in B^0 --] K^0_s K^0_s K^0_s Decays
Author: B. Aubert
Publisher:
Total Pages: 17
Release: 2006
Genre:
ISBN:

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The authors present an updated measurement of the time-dependent CP-violating asymmetry in B{sup 0} {yields} K{sub S}{sup 0}K{sub S}{sup 0}K{sub S}{sup 0} decays based on 347 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. The authors obtain the CP asymmetries S{sub f} = -0.66 {+-} 0.26 {+-} 0.08 and C{sub f} = -0.14 {+-} 0.22 {+-} 0.05, where the first uncertainties are statistical and the second systematic.


Update of Time-Dependent CP Asymmetry Measurements in B to C-cbar-s Decays

Update of Time-Dependent CP Asymmetry Measurements in B to C-cbar-s Decays
Author:
Publisher:
Total Pages: 19
Release: 2008
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ISBN:

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We 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) → B{bar B} decays collected with the BABAR detector at the PEP-II B factory. The time-dependent CP asymmetry parameters measured from J/[psi]K{sub S}°, J/[psi]K{sub L}°, [psi](2S)K{sub S}°, [chi]{sub c1}K{sub S}°, [eta]{sub c}K{sub S}°, and J/[psi]K*° decays are: (1) C{sub f} = 0.026 ± 0.020(stat) ± 0.016(syst); and (2) S{sub f} = 0.691 ± 0.029(stat) ± 0.014(syst).


Time-Dependent CP Violation Measurements

Time-Dependent CP Violation Measurements
Author: Markus Röhrken
Publisher: Springer Science & Business Media
Total Pages: 205
Release: 2013-10-17
Genre: Science
ISBN: 3319007262

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This thesis describes a high-quality, high-precision method for the data analysis of an interesting elementary particle reaction. The data was collected at the Japanese B-meson factory KEKB with the Belle detector, one of the most successful large-scale experiments worldwide. CP violation is a subtle quantum effect that makes the world look different when simultaneously left and right and matter and antimatter are exchanged. This being a prerequisite for our own world to have developed from the big bang, there are only a few experimental indications of such effects, and their detection requires very intricate techniques. The discovery of CP violation in B meson decays garnered Kobayashi and Maskawa, who had predicted these findings as early as 1973, the 2008 Nobel prize in physics. This thesis describes in great detail what are by far the best measurements of branching ratios and CP violation parameters in two special reactions with two charm mesons in the final state. It presents an in-depth but accessible overview of the theory, phenomenology, experimental setup, data collection, Monte Carlo simulations, (blind) statistical data analysis, and systematic uncertainty studies.


Measurements of Time-dependent CP Asymmetries in B0 --] D(*)+D(*)- Decays

Measurements of Time-dependent CP Asymmetries in B0 --] D(*)+D(*)- Decays
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Total Pages: 13
Release: 2009
Genre:
ISBN:

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We present new measurements of time-dependent CP asymmetries for B° --> D{sup (*)+}d{sup (*)-} decays using (467 ± 5) x 106 B{bar B} pairs collected with the BABAR detector located at the PEP-II B Factory at the Stanford Linear Accelerator Center. We determine the CP-odd fraction of the B° --> D*D*− decays to be R(up tack) = 0.158 ± 0.028 ± 0.006 and find CP asymmetry parameters for the CP-even component of the decay S+ = -0.76 ± 0.16 ± 0.04 and C+ = 0.00 ± 0.12 ± 0.02. We measure S = -0.63±0.36±0.05 and C = -0.07±0.23±0.03 for B° --> DD−, S = -0.62±0.21±0.03 and C = 0.08 ± 0.17 ± 0.04 for B° --> D*+D−, and S = -0.73 ± 0.23 ± 0.05 and C = 0.00 ± 0.17 ± 0.03 for B° --> D+D*−. For the B° --> D*{sup ±}D{sup {-+}} decays, we also determine the CP-violating asymmetry A = 0.008 ± 0.048 {+-} 0.013. In each case, the first uncertainty is statistical and the second is systematic. The measured values for the asymmetries are all consistent with the Standard Model.


Measurement of Time-Dependent CP Asymmetry in B0 --] KS Pi0 Gamma Decays

Measurement of Time-Dependent CP Asymmetry in B0 --] KS Pi0 Gamma Decays
Author:
Publisher:
Total Pages: 7
Release: 2008
Genre:
ISBN:

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The authors measure the time-dependent CP asymmetry in B° 2!K{sub S}°[pi]°[gamma] decays for two regions of K{sub S}°-[pi]° invariant mass, m(K{sub S}°[pi]°), using the final BABAR data set of 467 x 106 B{bar B} pairs collected at the PEP-II ee− collider at SLAC. They find 339 ± 24 B° 2!K*°[gamma] candidates and measure S{sub K*[gamma]} = -0.03 ± 0.29 ± 0.03 and C{sub K*[gamma]} = -0.14 ± 0.16 ± 0.03. In the range 1.1


Measurement of Time-dependent CP-Violating Asymmetries in B0 -] K+K-K0L Decays

Measurement of Time-dependent CP-Violating Asymmetries in B0 -] K+K-K0L Decays
Author: J. C. Chen
Publisher:
Total Pages: 19
Release: 2005
Genre:
ISBN:

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The authors present preliminary measurements of the Cp asymmetry parameters and CP content in B{sup 0} {yields} K{sup +}K{sup -}K{sub L}{sup 0} decays, with B{sup 0} {yields} {phi}K{sub L}{sup 0} events excluded. In a sample of 227 M B{bar B} pairs collected by the BABAR detector at the PEP-II B Factory at SLAC, they find the CP parameters to be S = 0.07 {+-} 0.28(stat){sub -0.12}{sup +0.11}(syst); C = 0.54 {+-} 0.22(stat){sub -0.09}{sup +0.08}(syst) where the first error is statistical and the second is systematic. Estimating the fraction of CP-odd final states from angular moments analysis in the K{sup +}K{sup -}K{sub S}{sup 0} CP-conjugate final state, f{sub odd}(K{sup +}K{sup -}K{sub L}{sup 0}) = 0.92 {+-} 0.07(stat) {+-} 0.06(syst), they determine sin2{beta}{sub eff} = 0.09 {+-} 0.33(stat){sub -0.14}{sup +0.13}(syst) {+-} 0.10(syst CP-cont) where the last error is due to uncertainty on the CP content.