Measurement Of The Mixing Parameters Of Neutral Charm Mesons And Search For Indirect Cp Violation With D0 K0 S Decays At Lhcb
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Cern Courier
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Author :
language : en
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Release Date : 2013
Cern Courier written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Nuclear energy categories.
Mixing And Cp Violation In Charm Meson Decays
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Author :
language : en
Publisher:
Release Date : 2010
Mixing And Cp Violation In Charm Meson 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 2010 with categories.
Mixing and CP violation (CPV) in the neutral D system were first discussed over thirty years ago but mixing was observed for the first time only very recently. Since then, these observations have been confirmed in other experiments and in other D° decay modes. Unlike the K, B and B{sub s} systems, for which mixing was observed years earlier, the short distance ([Delta]C = 2) amplitude contributing to mixing in the D system arises from box diagrams with down- rather than up-type quarks in the loops. The d and s components are GIM-suppressed, and the b component is suppressed by the small V{sub ub} CKM coupling. In the standard model (SM), therefore, long range, non-perturbative effects, a coherent sum over intermediate states accessible to both D° and {bar D}°, are the main contribution to mixing. These are hard to compute reliably, however. The phenomenon of mixing in neutral meson systems has now been observed in all flavours, but only in the past year in the D° system. The standard model anticipated that, for the charm sector, the mixing rate would be small, and also that CP violation, either in mixing or in direct decay, would be below the present levels of observability. It is hoped that further study of these phenomena might reveal signs of new physics. A review of recently available, experimental results is given.
Measurement Of Cp Violation Parameters In B Quark Decays To Charm Anticharm Down Quarks Exclusive Decays At The Babar Experiment
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Author :
language : en
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Release Date : 2003
Measurement Of Cp Violation Parameters In B Quark Decays To Charm Anticharm Down Quarks Exclusive Decays At The Babar Experiment written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
The BABAR experiment at SLAC provides an opportunity for measurement of CP violation in B decays. A measurement of time-dependent CP violating asymmetries using exclusive B meson decays where the b quark decays to c[bar c]d (including B[sup 0][yields] D*[sup+]D*[sup -] and B[sup 0][yields] D*[sup[+-]]D[sup[-+]] decays) is presented here. This is the first measurement of CP violation in a mode sensitive to the Unitarity Triangle parameter sin2[beta] outside of decays containing charmonium. It provides a comparison to measurements of sin2[beta] using b[yields] c[bar c]s, and permits an observation into potential new physics sources of CP violation, such as supersymmetry, via differences between these measurements and those of B[sup 0][yields] J/[psi] K[sub S][sup 0] as statistics of reconstructed neutral B decays to D[sup (*)+] D[sup (*)-] increase. The measured value of the time-dependent CP violating asymmetries are: S= 0.38[+-] 0.88(stat)[+-] 0.12(syst) and C= -0.30[+-] 0.50(stat)[+-] 0.13(syst) for B[sup 0][yields] D*[sup -] D[sup+]; S= -0.43[+-] 1.41(stat)[+-] 0.23(syst) and C= 0.53[+-] 0.74(stat)[+-] 0.15(syst) for B[sup 0][yields] D*[sup+] D[sup -]; and S= -0.05[+-] 0.45(stat)[+-] 0.05(syst) and C= 0.12[+-] 0.30(stat)[+-] 0.05(syst) for B[sup 0][yields] D*[sup -] D[sup+]; where S corresponds to CP violation in the interference of mixing and decay and C corresponds to CP violation in decay.
Mixing And Cp Violation At The Tevatron
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language : en
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Release Date : 2008
Mixing And Cp Violation At The Tevatron 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.
Measurements of meson mixing and CP violation parameters obtained by the CDF and D0 experiments at the Fermilab Tevatron are presented. These include results on B{sub s} and D meson mixing, and searches for CP violation in the decay B 2!J/[psi]K, in mixing through semileptonic B{sub s} meson decays, and in the interference between mixing and decay in the process B{sub s} 2!J/[psi][phi].
Search For Cp Violation In The Decays D0 To K K And D0 To Pi Pi
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Author :
language : en
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Release Date : 2007
Search For Cp Violation In The Decays D0 To K K And D0 To Pi Pi 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.
We measure CP-violating asymmetries of neutral charmed mesons in the modes D° → K−K and D° →?−?+ with the highest precision to date by using D° → K−?+ decays to correct detector asymmetries. An analysis of 385.8 fb−1 of data collected with the BaBar detector yields values of a{sup KK}{sub CP} = (0.00 ± 0.34 (stat.) ± 0.13 (syst.))% and a{sup?{pi}}{sub CP} = ( -0.24 ± 0.52 (stat.) ± 0.22 (syst.))%, which agree with Standard Model predictions.
Measurement Of Cp Violating Asymmetries In Neutral B Meson Decays Into Three Kaons
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Author :
language : en
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Release Date : 2008
Measurement Of Cp Violating Asymmetries In Neutral B Meson Decays Into Three Kaons 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 Standard Model (SM) of particle physics successfully describes all of the observed interactions of the fundamental particles (with the exception of non-zero neutrino mass). Despite this enormous success, the SM is widely viewed as an incomplete theory. For example, the size of the asymmetry between matter and antimatter is not nearly large enough to account for the abundance of matter observed throughout the universe. It is thus believed that as-yet-unknown physical phenomena must exist that introduce new asymmetries between matter and antimatter. In this thesis, by studying decays that happen only rarely in the SM, we make measurements of asymmetries between matter and antimatter that are potentially sensitive to the existence of processes beyond the SM. At the PEP-II asymmetric-energy B Factory at SLAC, electrons and positrons are collided at the [Upsilon](4S) resonance to create pairs of B mesons. The BABAR detector is used to measure the subsequent decay products. Using 383 million [Upsilon](4S) 2!B$\bar{B}$ decays, we study the decay B0 2!K+K-K0. In the SM, this decay is dominated by loop amplitudes. Asymmetries between matter and antimatter (CP asymmetries) are extracted by measuring the time-dependence of the complex amplitudes describing the B0 and $\bar{B}$0 decays as functions of their kinematics. The interference between decays with and without the mixing of neutral B mesons allows for the measurement of the angle [beta]eff, which is a measure of CP violation. We also measure the direct CP asymmetry ACP. Data samples reconstructed from three K0 modes (KS0 2![pi]+[pi]-, KS0 2![pi]0[pi]0, and KL0) are fit simultaneously. They find ACP = -0.015 ± 0.077 ± 0.053 and [beta]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]eff is disfavored with a significance of 4.5[sigma]. In a subsequent fit to the region with mK+K-> 1.1 GeV/c2, they find ACP = -0.054 ± 0.102 ± 0.060 and [beta]eff = 0.436 ± 0.087-0.031+0.055 rad, excluding the possibility that [beta]eff = 0 at 5.1[sigma]. They use the data with msub K+K-
Measurement Of Cp Violation In Neutral B Mesons Decaying To Phi K Short And Of Branching Fraction Of And Cp Violation In Neutral B Mesons Decaying To F0 980 K Short
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Author : Paul E. Kutter
language : en
Publisher:
Release Date : 2006
Measurement Of Cp Violation In Neutral B Mesons Decaying To Phi K Short And Of Branching Fraction Of And Cp Violation In Neutral B Mesons Decaying To F0 980 K Short 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.
Cp Violation And Mixing Of B Mesons At Cdf
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Author :
language : en
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Release Date : 1999
Cp Violation And Mixing Of B Mesons At Cdf written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.
We report recent studies of CP-violation and mixing in neutral B mesons from the CDF experiment at the Fermilab Tevatron Collider. Results of a direct measurement of the CP-violation parameter sin 2[beta] using B° → J/[psi]K{sub S}° with multi flavor tagging algorithms, a search for B{sub s}° - {bar B}{sub s}° mixing using semileptonic decays, and the updated precision measurements of the B° - {bar B}° mixing parameter will be presented. The prospects for B physics with the upgraded CDF detector in the next Tevatron Collider run will also be discussed.
Searches For New Physics In Cp Violation From Babar
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language : en
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Release Date : 2015
Searches For New Physics In Cp Violation 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 2015 with categories.
Results of recent searches for new physics in CP violation in charm decays from the BABAR experiment are presented. These results include a measurement of D0 - anti D0 mixing and searches for CP violation in two-body D0 decays, a search for CP violation in the charm decays D" 2!KS0K " and D s" 2!KS0K", KS0[pi]", and a search for direct CP violation in the singly-Cabibbo suppressed D" 2!K+K-[pi]"decays. These studies are based on the fi nal dataset collected by BABAR at the PEP-II B factory at SLAC in the period 1999-2008. No evidence of CP violation is found in these charm decays. The measured mixing parameter yCP = [0.72 " 0.18(stat) " 0.12(syst)]% excludes the no-mixing null hypothesis with a signifi cance of 3.3[sigma].
Measurement Of Mixing And Cp Violation In The Two Body D0 Decays To Kk Pipi And Kpi With The Babar Experiment
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Author :
language : en
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Release Date : 2012
Measurement Of Mixing And Cp Violation In The Two Body D0 Decays To Kk Pipi And Kpi With The Babar Experiment written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
In this thesis we present the measurement of D0 - $\bar{D}$0 mixing parameter yCP using the full BABAR data sample. We also searched for CP violation in the D0 → K+K-, [pi]+[pi]- channels, finding the parameter [Delta]Y compatible with zero. In Chapter 1, we briefly review the SM and introduce the theoretical framework of neutral meson mixing and CP violation. The BABAR detector and the performance of each sub-detector are described in Chapter 2. In Chapter 3, we present an overview of the analysis including a brief description of the previous similar BABAR analyses and the expected improvements in the present analysis. The candidate reconstruction and selection are described in Chapter 4, together with the optimization of the signal region. The signal and background event classes are described in Chapter 5, where we also provide the probability density functions used to extract the mixing and CP violating parameter. In Chapter 6 we describe the various crosschecks performed to validate the analysis and the evaluation of the systematic error. Finally in Chapter 7 we present the final results and their interpretation.