Measurement Of Cp Violating Parameters In Fully Reconstructed B D Pi And B Drho Decays
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Measurement Of Cp Violating Parameters In Fully Reconstructed B D Pi And B Drho Decays
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Author :
language : en
Publisher:
Release Date : 2004
Measurement Of Cp Violating Parameters In Fully Reconstructed B D Pi And B Drho 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.
While the measurement of sin2[beta] is now a precision measurement, the constraints on the other two angles of the Unitarity Triangle, [alpha] and [gamma], are still limited by statistics and/or by theoretical uncertainties. This paper reports on the measurement of CP-violating asymmetries in B[sup 0] --> D(*)[sup [+-]][pi][sub [-+]] and B[sup 0] --> D[sup [+-]][rho][sup [-+]] decays in [Upsilon](4S) --> B[bar B] decays, asymmetries which are rleated to sin(2[beta] + [gamma]). This analysis updates the results already published by including a new decay mode (B[sup 0] --> D[sup [+-]][rho][sup [-+]]) and a larger data sample (110 instead of 88 million [Upsilon](4S) --> B[bar B] decays).
Measurement Of Cp Violating Parameters In Fully Reconstructed B To D Pi And B To D Rho Decays
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Author : J. C. Chen
language : en
Publisher:
Release Date : 2005
Measurement Of Cp Violating Parameters In Fully Reconstructed B To D Pi And B To D Rho 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 CP-violating parameters in fully reconstructed B{sup 0} {yields} D{sup (*){+-}}{pi}{sup {-+}} and B{sup 0} {yields} D{sup {+-}}{rho}{sup {-+}} decays in approximately 232 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC.
Measurement Of Time Dependent Cp Asymmetries Inb0 D Pi And B0 Drho Decays
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Author :
language : en
Publisher:
Release Date : 2006
Measurement Of Time Dependent Cp Asymmetries Inb0 D Pi And B0 Drho 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 2006 with categories.
We present updated results on time-dependent CP asymmetries in fully reconstructed B° → D{sup (*)±}[pi]{sup {-+}} and B° → D{sup ±}[rho]{sup {-+}} decays in approximately 232 million [Upsilon](4S) → B{bar B} events collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. From a time-dependent maximum likelihood fit we obtain for the parameters related to the CP violation angle 2[beta] + [gamma]: a{sup D{pi}} = -0.010 ± 0.023 ± 0.007, c{sub lep}{sup D{pi}} = -0.033 ± 0.042 ± 0.012, a{sup D*{pi}} = -0.040 ± 0.023 ± 0.010, C{sub lep}{sup D*{pi}} = 0.049 ± 0.042 ± 0.015, a{sup D{rho}} = -0.024 ± 0.031 ± 0.009, c{sub lep}{sup D{rho}} = -0.098 {+-} 0.055 {+-} 0.018, where the first error is statistical and the second is systematic. Using other measurements and theoretical assumptions, we interpret the results in terms of the angles of the Cabibbo-Kobayashi-Maskawa unitarity triangle and find
Measurement Of Direct Cp Violation Parameters In B Pm To J Psi K Pm And B Pm To J Psi Pi Pm Decays With 10 4 Fb 1 Of Tevatron Data
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Author :
language : en
Publisher:
Release Date : 2013
Measurement Of Direct Cp Violation Parameters In B Pm To J Psi K Pm And B Pm To J Psi Pi Pm Decays With 10 4 Fb 1 Of Tevatron Data 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 categories.
A Measurement Of The Cp Parameter Sine Two Beta Using Fully Reconstructed B To Ccbar Decays At The Babar Experiment
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Author :
language : en
Publisher:
Release Date : 2003
A Measurement Of The Cp Parameter Sine Two Beta Using Fully Reconstructed B To Ccbar 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.
This dissertation presents a measurement of the time-dependent CP-violating asymmetries in the neutral B-meson system performed with data collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at the Stanford Linear Accelerator Center. The data sample used consists of 29.7 fb[sup -1] collected at the[Upsilon](4S) resonance and 3.9 fb[sup -1] collected off-resonance. We analyze three samples of fully-reconstructed B-meson decays: a sample of decays to CP eigenstates in the modes J/[psi] K[sub s][sup 0], [psi](2S) K[sub s][sup 0], [chi][sub cl] K[sub s][sup 0], and J/[psi] K*[sup 0] (822 events); as well as both charged (14304 events) and neutral (10457 events) B decays to flavor-eigenstates including D[sup (*)] and[pi]/[rho]/[alpha][sub 1]. In all cases, the proper decay time difference between the reconstructed B-meson and the recoiling B-meson is determined by measuring the separation of the two decay vertices. Furthermore, the flavor of the recoiling B-meson is tagged using a neural network algorithm. We use the flavor-eigenstate samples to calibrate both the vertexing and tagging performance. We measure the amplitude of the CP asymmetry, sin2[beta]= 0.61[+-] 0.14(stat)[+-] 0.06(syst). These results indicate the existence of indirect CP violation in the B-meson system.
A Measurement Of The Cp Parameter Sin2 Using Fully Reconstructed B Cc Decays At The Babar Experiment
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Author : Eric Charles
language : en
Publisher:
Release Date : 2002
A Measurement Of The Cp Parameter Sin2 Using Fully Reconstructed B Cc Decays At The Babar Experiment written by Eric Charles and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
Measurement Of Cp Violation In B Anti B Mixing On The Recoil Of Partially Reconstructed Anti B0 To D L Anti Nu L Using Kaon Tags
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Author :
language : en
Publisher:
Release Date : 2011
Measurement Of Cp Violation In B Anti B Mixing On The Recoil Of Partially Reconstructed Anti B0 To D L Anti Nu L Using Kaon Tags written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
After its formulation in 1960's the Standard Model of Fundamental Interactions has gone through an impressive series of successes, begun with the discovery of neutral weak currents [1] and the experimental observations of the massive carriers of weak interactions, the W± and Z0 bosons [2], [3]. High precision measurements performed at LEP and SLAC test the validity of the theory to an unprecedented level of accuracy and do not show any significant deviations with respect to the Standard Model predictions. One of the attractive features of the Standard Model is the description of the phenomena which violate the matter-antimatter symmetry (CP), and this violation uniquely depends (in the quark sector) on a weak phase in the matrix describing the couplings among different quark flavors. CP-violation was discovered in 1964 as a tiny effect in the mixing of the K0 - $\bar{K}$0 system [12] but, after a few decades of study of the physics of K mesons, no strong confirmation of the Standard Model can be obtained on the mechanism which generates CP-violation. On the other hand the physics of B mesons is suitable for a pretty large number of measurements which can confirm or disprove this aspect of the theory. The main goal of the BABAR and Belle experiments physics program is to test the description of CP-violation and flavor physics mainly from the decays of Bu and Bd mesons. Soon after the beginning of data-taking in 1999, CP-violation was discovered in the interference between mixing and decay in the golden channel B0 → J/[Psi]}K0 [17] [18], while in 2004 a large direct charge asymmetry was observed in the B0 → K+[pi]- channel [16]. There is a third kind of CP-violation which can be exhibited by the Bd - $\bar{B}$d system, the so called CP-violation in mixing. The Standard Model predicts this asymmetry to be small, possibly out of reach of current experiments, but several New Physics models contain new particles and couplings which can enhance it up to detectable levels. In this thesis we search for CP-violation in Bd - $\bar{B}$d mixing at the BABAR experiment. We reconstruct one of the two B mesons produced at the PEP-II electromagnetic collider using the partial reconstruction technique, while the flavor of the other B is inferred by the charge of a kaon identified among its decay products. Given the smallness of the physical asymmetry we want to measure, a crucial aspect of this analysis is the control of spurious charge asymmetries arising from the interaction of particles with the detector material. We accomplish this by using a control sample of charged kaons on the same data we use in our analysis. After a brief introduction of the theoretical framework and the phenomenology of the decays of B mesons at a B-factory (chapters 1 and 2), we will review in chapter 3 the current experimental results on this topic. We will then describe the characteristics of the collider and the experimental apparatus (chapter 4) used to perform our measurement. The available dataset and the event pre-selection techniques are treated in chapter 5, while the analysis method is discussed in detail in the following one. In chapters 7 and 8 the definitions of the probability density functions used to model each component of our sample are given and then they are tested in samples of simulated data. Toy and reweighted Monte Carlo data are used in chapter 9 to test the sensitivity of our fitting procedure to the physical parameters related to CP violation; chapter 10 discusses the possibility of modeling some of the components of our sample directly on the data. Finally the fit on the real data sample is described in chapter 11 and the treatment of systematic uncertainties is done in chapter 12, while the final result is given in chapter 13.
Time Dependent Cp Violation Measurements
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Author : Markus Röhrken
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-10-17
Time Dependent Cp Violation Measurements written by Markus Röhrken and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-10-17 with Science categories.
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.
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.
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
Publisher:
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° 2!D*D*− and B° 2!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 2!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° 2!J/[psi] K{sub S}° 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° 2!D*− D; S = -0.43 ± 1.41(stat) ± 0.23(syst) and C = 0.53 ± 0.74(stat) ± 0.15(syst) for B° 2!D*+ D−; and S = -0.05 ± 0.45(stat) ± 0.05(syst) and C = 0.12 ± 0.30(stat) {+-} 0.05(syst) for B° 2!D*− D+; where S corresponds to CP violation in the interference of mixing and decay and C corresponds to CP violation in decay.