Measurement of CP Asymmetries in B0 to Phi K0 and B0 to K+K-Ks Decays PDF Download
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Languages : en
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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.
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Languages : en
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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.
![Measurement of CP Asymmetry in B0 ---] F0 K0(S), B0 ---] Phi K0 And B0 ---] K+ K- K0(S) Decays PDF](https://books.google.com/books/content/images/frontcover/iJ9wAQAACAAJ?fife=w80-h100)
Author: Paul E. Kutter
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Languages : en
Pages : 4
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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.
![Branching Fractions and CP Asymmetries in B0-]K+K-Ks and B+-]K+KsKs PDF](https://books.google.com/books/content/images/frontcover/udKHAQAACAAJ?fife=w80-h100)
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Languages : en
Pages : 7
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The authors measure the branching fractions and CP asymmetries in the decays B° 2!KK−K{sub S}° and B 2!K+K{sub S}°K{sub S}° using a sample of approximately 122 million B{bar B} pairs collected by the BABAR detector. From a time-dependent analysis of the K+K− K{sub S}° sample that excludes [phi]K{sub S}°, the values of the CP-violation parameters are S = -0.56 ± 0.25 ± 0.04 and C = -0.10 ± 0.19 ± 0.10, where the first uncertainty is statistical, the second is systematic. They confirm that the final state is nearly purely CP-even. Using this result and setting C = 0, they extract the Standard Model parameter sin 2[beta] = 0.57 ± 0.26 ± 0.04−0{sup +0.17} where the last error is due to uncertainty on the CP content. The present the first measurement of the CP-violating charge asymmetry A{sub CP} B+ 2!K+K{sub S}°K{sub S}° = -0.04 ± 0.11 ± 0.02, with a 90% confidence-level interval of [-0.23, 0.15]. The branching fractions are [Beta](B° 2!K+K−K°) = (23.8 ± 2.0 ± 1.6) x 10−6 and [Beta](B+ 2!K+K{sub S}°K{sub S}°) = (10.7 ± 1.2 ± 1.0) x 10−6.
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Languages : en
Pages : 7
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The authors analyze the decay B° 2!KK−K° using 383 million B{bar B} events collected by the BABAR detector at SLAC to extract CP violation parameter values over the Dalitz plot. Combining all KK−K° events, they find A{sub CP} = -0.015 ± 0.077 ± 0.053 and [beta]{sub eff} = 0.352 ± 0.076 ± 0.026 rad, corresponding to a CP violation significance of 4.8[sigma]. A second solution near [pi]/2 - [beta]{sub eff} is disfavored with a significance of 4.5[sigma]. They also report A{sub CP} and [beta]{sub eff} separately for decays to [phi](1020)K°, f0(980)K°, and K+K−K° with m{sub K{sup +}K−}> 1.1 GeV/c2.
![Measurement of CP Asymmetries in B0-]Ks Pi0 Pi0 Decays PDF](https://books.google.com/books/content/images/frontcover/Tt6zAQAACAAJ?fife=w80-h100)
Author: J. C. Chen
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Languages : en
Pages : 17
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The authors present a preliminary measurement of the time-dependent CP asymmetry for the neutral B-meson decay into the CP = +1 final state K{sub S}{sup 0}{pi}{sup 0}{pi}{sup 0}, with K{sub S}{sup 0} {yields} {pi}{sup +}{pi}{sup -} and {pi}{sup 0} {yields} {gamma}{gamma}. They use a sample of approximately 227 million B-meson pairs recorded at the {Upsilon}(4S) resonance by the BABAR detector at the PEP-II B-Factory at SLAC. From a maximum likelihood fit they extract the mixing-induced CP-violation parameter S{sub K{sub S}{sup 0}{pi}{sup 0}{pi}{sup 0}} = 0.84 {+-} 0.71(stat) {+-} 0.08(syst) and the direct CP-violation parameter C{sub K{sub S}{sup 0}}{pi}{sup 0}{pi}{sup 0} = 0.27 {+-} 0.52(stat) {+-} 0.13(syst), where the first uncertainty is statistical and the second systematic.
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Languages : en
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![Measurement of CP Asymmetry in B° --] KK−K°S Decays PDF](https://books.google.com/books/content/images/frontcover/mJODAQAACAAJ?fife=w80-h100)
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Languages : en
Pages : 5
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The authors present preliminary measurements of the CP asymmetry parameters and CP content in B° --> KK−K{sub s}° decays, with [phi]K{sub s}° 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 = -0.42 ± 0.17 ± 0.04 and C = 0.10 ± 0.14 ± 0.06, where the first error is statistical and the second systematic. Extracting the fraction of CP-even final states from angular moments f{sub even} = 0.89 ± 0.08 ± 0.06, and setting C = 0, they determine sin 2[beta] = 0.55 ± 0.22 ± 0.04 ± 0.11, where the last error is due to uncertainty on the CP content.
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Languages : en
Pages : 10
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Author: D. Dujmic
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Languages : en
Pages : 27
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The authors present a preliminary measurement of CP-violation parameters in the decay B{sup 0} {yields} K{sup +}K{sup -}K{sup 0}, using approximately 347 million B{bar B} events collected by the BABAR detector at SLAC. Reconstructing the neutral kaon as K{sub S}{sup 0} {yields} {pi}{sup +}{pi}{sup -}, K{sub S}{sup 0} {yields} {pi}{sup 0}{pi}{sup 0}, or K{sub L}{sup 0}, they analyze the Dalitz plot distribution and measure fractions to intermediate states. They extract CP parameters from the asymmetries in amplitudes and phases between B{sup 0} and {bar B}{sup 0} decays across the Dalitz plot. For decays to {phi}K{sup 0}, they find {beta}{sub eff} = 0.06 {+-} 0.16 {+-} 0.05, A{sub CP} = -0.18 {+-} 0.20 {+-} 0.10, where the first uncertainty is statistical and the second one is systematic. For decays to f{sub 0}K{sup 0}, they find {beta}{sub eff} = 0.18 {+-} 0.19 {+-} 0.04, A{sub CP} = 0.45 {+-} 0.28 {+-} 0.10. Combining all K{sup +}K{sup -}K{sup 0} events and taking account of the different CP eigenvalues of the individual Dalitz plot components, they find {beta}{sub eff} = 0.361 {+-} 0.079 {+-} 0.037, A{sub CP} = -0.034 {+-} 0.079 {+-} 0.025. The trigonometric reflection at {pi}/2 - {beta}{sub eff} is disfavored at 4.6{sigma}. They also study angular distributions in B{sup 0} {yields} K{sup +}K{sup -}K{sub S}{sup 0} and B{sup +} {yields} {phi}K{sup +} decays and measure the direct CP asymmetry in B{sup +} {yields} {phi}K{sup +} decays, A{sub CP} = 0.046 {+-} 0.046 {+-} 0.017.
![Measurement of CP-Violating Asymmetries in the B0-]K+K-Ks Dalitz Plot PDF](https://books.google.com/books/content/images/frontcover/JlXWwQEACAAJ?fife=w80-h100)
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Languages : en
Pages : 22
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The authors present a preliminary measurement of CP-violation parameters in the decay B° → KK−K{sub S}°, using approximately 465 million B{bar B} events collected by the BABAR detector at SLAC. Reconstructing the neutral kaon as K{sub S}° →?+?− or K{sub S}° →?°?°, they analyze the Dalitz plot distribution and measure fractions to intermediate states. They extract CP parameters from the asymmetries in amplitudes and phases between B° and {bar B}° decays across the Dalitz plot. From a fit to the whole Dalitz plot, they measure?{sub eff} = 0.44 ± 0.07 ± 0.02, A{sub CP} = 0.03 ± 0.07 ± 0.02, where the first uncertainties are statistical and the second ones are systematic. For decays to?K{sub S}°, they measure?{sub eff} = 0.13 ± 0.13 ± 0.02, A{sub CP} = 0.14 ± 0.19 ± 0.02. For decays to f0K{sub S}°, they measure?{sub eff} = 0.15 ± 0.13 ± 0.03, A{sub CP} = 0.01 ± 0.26 ± 0.07. From a fit to the region of the Dalitz plot with m{sub K{sup +}K−}> 1.1 GeV/c2, they measure?{sub eff} = 0.52 ± 0.08 ± 0.03, A{sub CP} = 0.05 ± 0.09 ± 0.04.
