Measurement Of Cp Asymmetries In B0 To Phi K0 And B0 To K K Ks Decays
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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.
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.
Branching Fractions And Cp Asymmetries In B0 K K Ks And B K Ksks
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Author :
language : en
Publisher:
Release Date : 2004
Branching Fractions And Cp Asymmetries In B0 K K Ks And B K Ksks 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 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.
Physics Briefs
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Author :
language : en
Publisher:
Release Date : 1992
Physics Briefs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Physics categories.
Science Citation Index
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Author :
language : en
Publisher:
Release Date : 1994
Science Citation Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Science categories.
Vols. for 1964- have guides and journal lists.
Measurements Of Cp Violating Asymmetries In The Decay B0 To K K K0
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Author :
language : en
Publisher:
Release Date : 2007
Measurements Of Cp Violating Asymmetries In The Decay B0 To K K K0 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 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.
C R Monie Du Centenaire De La Naissance De Jean Charcot La Sorbonne Le 25 Mai 1925 Discours De M Charles Lallemand
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Author :
language : en
Publisher:
Release Date : 1925
C R Monie Du Centenaire De La Naissance De Jean Charcot La Sorbonne Le 25 Mai 1925 Discours De M Charles Lallemand written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1925 with categories.
Measurement Of Cp Asymmetry In B Kk K S Decays
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Author :
language : en
Publisher:
Release Date : 2004
Measurement Of Cp Asymmetry In B Kk K S 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 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.
Time Dependent Cp Asymmetries And Branching Ratiomeasurements In Charmless Three Body B Decays At Babar
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Author :
language : en
Publisher:
Release Date : 2007
Time Dependent Cp Asymmetries And Branching Ratiomeasurements In Charmless Three Body B Decays At 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 2007 with categories.
In this work we presented measurements of CP violation and decay rates of B decays in final states not involving a charm quark in the final state. In particular, the time-dependent CP asymmetries of decays which proceed through b 2!s elementary transition is a particularly sensitive probe of physics beyond the Standard Model. In fact, even if the precise measurements of CP conserving and CP violating processes show the success of the CKM picture of the flavour physics, the sector of b 2!s transitions is still not strongly constrained and leaves room for new physics contributions. In particular, we considered the decays which have the cleanest theoretical prediction within the Standard Model: B° 2![phi]K° and B° 2!K{sub s}°K{sub s}°K{sub s}° [beta]{sub eff}{sup SM} = 0.379. We examined the former with a completely new approach with respect to the past: the study of CP violation in the whole KK−K° phase space through a time-dependent Dalitz plot analysis. With this approach, we simultaneously measured the CP-violating asymmetries of the [phi]KJ°, f0(980)K° resonant and KK−K° non-resonant contributions, avoiding one of the largest uncertainties which affected the previous measurements of B° 2![phi]K°. We find [beta]{sub eff}(B° 2![phi]K°) = 0.06 ± 0.16 ± 0.05, which is lower than the Standard Model expectation, but it is consistent with it within two standard deviations. Moreover, only a recently developed experimental technique, which allows the determination of the position of B decay vertex when no charged tracks are originating from it, has made possible the measurement of the time-dependent CP asymmetry in B° 2!K{sub s}°K{sub s}°K{sub s}° decays. The mixing-induced CP parameter S in the Standard Model should be equal to sin 2[beta] parameter, which is measured with high precision in B 2![c{bar c}]K° decays by the B-factories. This statement is true, in the Standard Model, with excellent approximation for the decays studied in this work. The summary of the measurements in the b 2!s sector is shown in Fig. 9.8 A naive average of the b 2!s penguins, which does not account for the correlations existing among [phi]K°, f0(980)K° and K+K−K°, and that includes also modes with larger theoretical uncertainties, shows that -[eta]{sub CP} x S is lower than sin 2[beta]. This is not an evidence of physics beyond the Standard Model, but the systematic deviation from the expected value is an hint that there is room for it. More compelling evidence for new physics could be obtained measuring significant deviation in each decay channel from Standard Model prediction. Currently all the measurement are statistically limited and therefore an increase in accumulated statistics will shed more light into this quest for New Physics.
Measurement Of Cp Asymmetries In B0 Ks Pi0 Pi0 Decays
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Author : J. C. Chen
language : en
Publisher:
Release Date : 2005
Measurement Of Cp Asymmetries In B0 Ks Pi0 Pi0 Decays 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.
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.