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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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.

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.

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.

A Measurement Of Cp Violation Parameters In B0b0barmixing Using Partially Reconstructed D L Nu L Events At Babar

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Author :
language : en
Publisher:
Release Date : 2006

A Measurement Of Cp Violation Parameters In B0b0barmixing Using Partially Reconstructed D L Nu L Events 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 2006 with categories.

CP violation in B°{bar B}° mixing is characterized by the value of the parameter

Measurement Of The Cp Violation Parameter Of B0 Mixing And Decay With P Anti P Mu Mu X Data

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Author :
language : en
Publisher:
Release Date : 2006

Measurement Of The Cp Violation Parameter Of B0 Mixing And Decay With P Anti P Mu Mu X 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 2006 with categories.

The authors measure the dimuon charge asymmetry A in p{bar p} collisions at a center of mass energy √s 1960 GeV. The data was recorded with the D0 detector and corresponds to an integrated luminosity of approximately 1.0 fb−1. Assuming that the asymmetry A is due to asymmetric B° ↔ {bar B}° mixing and decay, they extract the CP-violation parameter of B° mixing and decay: R([epsilon]{sub B°}/1) +

B Physics And Cp Violation Proceedings Of The 2nd International Conference

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Author : Thomas E Browder
language : en
Publisher: World Scientific
Release Date : 1998-04-04

B Physics And Cp Violation Proceedings Of The 2nd International Conference written by Thomas E Browder and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998-04-04 with categories.

CP violation is one of the most subtle effects in the Standard Model of particle physics and may be the first clue to the physics that lies beyond. Charge conjugation, C, and parity, P, are symmetries of particle interactions. C corresponds to the operation of replacing a particle by its antiparticle, while P is the operation of mirror reflection. Before 1956, it was believed that these were also symmetries of the interactions of elementary particles. In 1956, C S Wu found evidence for P violation in the weak interaction. Theorists proposed that the combination of CP would be a symmetry of the weak interaction. In 1964, Christenson, Cronin, Fitch and Turlay found the first evidence for the violation of CP symmetry in the decays of kaons.Although Kobayashi and Maskawa then showed how the Standard Model can accommodate the observed CP violation, Wolfenstein pointed out that it is also possible that there is a new interaction in addition to the usual four, called the superweak interaction, which is responsible for the asymmetry. To test this idea, the observation of a different type of asymmetry, called direct CP violation, is required; in the kaon sector, very precise measurements of the ratio of kaon decay rates are necessary. In B decay modes where a second order weak process whimisically named “penguin” interferes with another suppressed, first order “tree” amplitude, it may also be possible to observe these direct CP-violating effects.B physics and CP violation is now one of the major growth areas in high energy physics. Nearly every major high energy physics laboratory now has a project underway to observe the large CP asymmetries expected in the B sector and to test the consistency of the Standard Model. The unitarity of the Kobayashi-Maskawa mixing matrix in the Standard Model implies the existence of three phases, called alpha, beta and gamma, which can be determined by the measurements of CP asymmetries in B decays. About 200 participants gathered in Hawaii in March 1997 to discuss the progress in the field, and this important book constitutes the proceedings of that conference.

Enhanced K L Pi0 Nu Anti Nu From Direct Cp Violation In B K Pi With Four Generations

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Author :
language : en
Publisher:
Release Date : 2005

Enhanced K L Pi0 Nu Anti Nu From Direct Cp Violation In B K Pi With Four Generations 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.

Recent CP violation results in B decays suggest that Z penguins may have large weak phase. This can be realized by the four generation (standard) model. Concurrently, B 2!X{sub s}ll− and B{sub s} mixing allow for sizable V*{sub t's}V{sub t'b} only if it is nearly imaginary. Such large effects in b 4!s transitions would affect s 4!d transitions, as kaon constraints would demand V{sub t'd} `"0. Using [Lambda](Z 2!b{bar b}) to bound.

B 0 Over D Mixing And Cp Violation Measurements At The Tevatron

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Author :
language : en
Publisher:
Release Date : 2000

B 0 Over D Mixing And Cp Violation Measurements 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 2000 with categories.

We present six time-dependent B0d mixing measurements of [Delta]md from the CDF Run I data. The CDF average is [Delta]md = .494".026".026(ps)-1. We also present a measurement of the CP-violating asymmetry sin(2[beta]) using a sample of B0/[anti B]0 [yields] J/[psi] K0s decays and report sin(2[beta]) = .79 +41-.44.

Study Of T And Cp Violation In B Anti B Mixing With Inclusive Dilepton Events

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Author :
language : en
Publisher:
Release Date : 2001

Study Of T And Cp Violation In B Anti B Mixing With 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 2001 with categories.

We report a study of T and CP violation in B°{bar B}° mixing using an inclusive dilepton sample collected by the BABAR experiment at the PEP-II B Factory. The asymmetry between ll and l−l− allows us to compare the probabilities for {bar B}° 2!B° and B° 2!{bar B}° oscillations and thus probe T and CP invariance. A sample of 20,381 same-sign dilepton events is selected in the 1999--2000 data sample, corresponding to an integrated luminosity of 20.7 fb−1 on the [Upsilon](4S) resonance. We measure a same-sign dilepton asymmetry of A{sub T} = (0.5 ± 1.2 ± 1.4)%; for the parameter [epsilon]{sub B} representing T and CP violations in mixing, we obtain a preliminary result of Re([epsilon]{sub B})/1 +