Search For Mixing Induced Cp Violation Using Partial Reconstruction Of B0bar D Xl Nubar And Kaon Tagging
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Search For Mixing Induced Cp Violation Using Partial Reconstruction Of B0bar D Xl Nubar And Kaon Tagging
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Author :
language : en
Publisher:
Release Date : 2016
Search For Mixing Induced Cp Violation Using Partial Reconstruction Of B0bar D Xl Nubar And Kaon Tagging written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Search For Cp Violation In B0b0bar Mixing Using Partial Reconstruction Of B0 D Xl Nu And A Kaon Tag
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Author :
language : en
Publisher:
Release Date : 2014
Search For Cp Violation In B0b0bar Mixing Using Partial Reconstruction Of B0 D Xl Nu And A Kaon Tag written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 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.
Measurement Of Cp Violation In Bb Mixing On The Recoil Of Partially Reconstructed B0 D L Nu L Using Tags
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Author : Alessandro Gaz
language : en
Publisher:
Release Date : 2008*
Measurement Of Cp Violation In Bb Mixing On The Recoil Of Partially Reconstructed B0 D L Nu L Using Tags written by Alessandro Gaz 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.
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.
Search For T And Cp Violation In B0 B0bar Mixing With Inclusive Dileptons Events
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Author :
language : en
Publisher:
Release Date : 2003
Search For T And Cp Violation In B0 B0bar Mixing With Inclusive Dileptons Events 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 authors report the results of a search for T and CP violation in B[sup 0]-[bar B][sup 0] mixing using an inclusive dilepton sample collected by the BABAR experiment at the PEP-II B Factory. The asymmetry between[ell][sup+][ell][sup+] and[ell][sup -][ell][sup -] events allows the authors to compare the probabilities for[bar B][sup 0][yields] B[sup 0] and B[sup 0][yields][bar B][sup 0] oscillations and thus probe T and CP invariance. Using a sample of 23 million B[bar B] pairs, they measure a same-sign dilepton asymmetry of A[sub T/CP]= (0.5[+-] 1.2(stat)[+-] 1.4(syst))%. For the modulus of the ratio of complex mixing parameters p and q, they obtainq/p= 0.998[+-] 0.006(stat)[+-] 0.007(syst).
Cp Violation
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Author : Cecilia Jarlskog
language : en
Publisher: World Scientific
Release Date : 1989-01-01
Cp Violation written by Cecilia Jarlskog and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989-01-01 with categories.
Contents:CP Phenomenology:Introduction to CP Violation (C Jarlskog)CP-Violation in the K0-K0-System (K Kleinknecht)The Quark Mixing Matrix, Charm Decays and B Decays (S Stone)The Question of CP Noninvariance — As Seen through the Eyes of Neutral Beauty (I I Bigi et al.)In Search of CP Noninvariance in Heavy Quark Systems (L-L Chau)CP Violation at High Energy e+e- Colliders (J Bernabéu & M B Gavela)CP Violation in the Standard Model with Four Families (A Datta & E A Paschos)CP Effects When Neutrinos are their Own Antiparticles (B Kayser)On Spontaneous CP Violation Triggered by Scalar Bosons (I I Bigi & A I Sanda)CP Violation and Left-Right Symmetry (R N Mohapatra)CP Violation and Supersymmetry (R N Mohapatra)Electric Dipole Moments (S M Barr & W H Marciano)Special Topics: The Strong CP Problem (R D Peccei)CP Violation and Cosmology (P Langacker)Nonleptonic Interactions:The 1/N Approach to Nonleptonic Weak Interactions (A J Buras)Chiral Perturbation Theory Approach to Weak Amplitudes (E de Rafael)What We Learnt from Weak Decays of Heavy Quarks (B Stech)Weak Hamiltonian on the Lattice (G Martinelli) Readership: High energy physicists. Keywords:CP Violation;Quark Mixing Matrix;Charm Decays;B Decays;Nonleptic Interactions;Heavy QuarksReview: “Similar material is most often available in journals, but the book accomplishes a valuable service in drawing it together … the one that will probably have the greatest utility and longest lifespan is the survey of B meson physics by I Bigi, V Khoze, N Uraltsev and A Sanda … Bigi et al. here provide the most thorough and readable account of the issues that I know of. I have seen no review comparable to the excellent summary of electric dipole moments by S Barr and W Marciano … the volume offers a generally readable entry into this field for a reader who has a basic background in particle physics.” John F Donoghue Science “… this book performs a very useful service for anyone active or interested in CP violation, both as a source of primary information and as a work of reference.” K J Peach J Phys. G: Nucl. Part. Phys.
First Flavor Tagged Determination Of Bounds On Mixing Induced Cp Violation In B 0 S J Psi Phi Decays
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Author :
language : en
Publisher:
Release Date : 2007
First Flavor Tagged Determination Of Bounds On Mixing Induced Cp Violation In B 0 S J Psi Phi 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 2007 with categories.
This Letter describes the first determination 1 of bounds on the CP-violation parameter 2[beta]{sub s} using B{sub s}° decays in which the flavor of the bottom meson at production is identified. The result is based on approximately 2, 000 B{sub s}° → J/[psi][phi] decays reconstructed in a 1.35 fb−1 data sample collected with the CDFII detector using p{bar p} collisions produced at the Fermilab Tevatron. We report confidence regions in the two-dimensional space of 2[beta]{sub s} and the decay-width difference [Delta][Lambda]. Assuming the standard model predictions of 2[beta]{sub s} and [Delta][Lambda], the probability of a deviation as large as the level of the observed data is 15%, corresponding to 1.5 Gaussian standard deviations.
Search For T Cp And Cpt Violation In B0 B0bar Mixingwith Inclusive Dilepton Events
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Author :
language : en
Publisher:
Release Date : 2006
Search For T Cp And Cpt Violation In B0 B0bar Mixingwith Inclusive Dilepton Events 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.
The authors report the results of a search for T, CP and CPT violation in B°-{bar B}° mixing using an inclusive dilepton sample collected by the BABAR experiment at the PEP-II B Factory. Using a sample of 232 million B{bar B} pairs, with a simultaneous likelihood fit of the same-sign and opposite-sign dileptons, they measure the T and Cp violation parameter
Flavor Mixing And Mixing Induced Cp Violation In The Neutral B System
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Author : Andrew Dean Foland
language : en
Publisher:
Release Date : 2000
Flavor Mixing And Mixing Induced Cp Violation In The Neutral B System written by Andrew Dean Foland and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.