Measurement Of The Cp Violating Phase Beta S In B0s J Psi Phi Decays With The Cdf Ii Detector
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Measurement Of The Cp Violating Phase Beta S In B0s J Psi Phi Decays With The Cdf Ii Detector
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Author :
language : en
Publisher:
Release Date : 2012
Measurement Of The Cp Violating Phase Beta S In B0s J Psi Phi Decays With The Cdf Ii Detector 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.
We present a measurement of the \CP-violating parameter \betas using approximately 6500 $\BsJpsiPhi$ decays reconstructed with the CDF\, II detector in a sample of $p\bar p$ collisions at $\sqrt{s}=1.96$ TeV corresponding to 5.2 fb${̂-1}$ integrated luminosity produced by the Tevatron Collider at Fermilab. We find the \CP-violating phase to be within the range $\betas \in [0.02, 0.52] \cup [1.08, 1.55]$ at 68% confidence level where the coverage property of the quoted interval is guaranteed using a frequentist statistical analysis. This result is in agreement with the standard model expectation at the level of about one Gaussian standard deviation. We consider the inclusion of a potential $S$-wave contribution to the $\Bs\to J/\psi K+̂K-̂$ final state which is found to be negligible over the mass interval $1.009
Measurement Of The Cp Violating Phase Beta S In B S J Psi Phi Decays
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Author :
language : en
Publisher:
Release Date : 2010
Measurement Of The Cp Violating Phase Beta S In B S J Psi Phi Decays written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
The CP violating phase [beta] j/[Psi][Phi]s is measured in decays of B0s → J/[Psi][Phi]. This measurement uses 5.2 fb-1 of data collected in √s = 1.96 TeV p$\bar{p}$ collisions at the Fermilab Tevatron with the CDF Run-II detector. CP violation in the Bs0-$\bar{B}$s0 system is predicted to be very small in the Standard Model. However, several theories beyond the Standard Model allow enhancements to this quantity by heavier, New Physics particles entering second order weak mixing box diagrams. Previous measurements have hinted at a deviation from the Standard Model expectation value for [beta]sJ/[Psi][Phi] with a significance of approximately 2[sigma]. The measurement described in this thesis uses the highest statistics sample available to date in the Bs0 → J/[Psi][Phi] decay channel, where J/[Psi] → [mu]+[mu]- and [Phi] → K+K-. Furthermore, it contains several improvements over previous analyses, such as enhanced signal selection, fully calibrated particle ID and flavour tagging, and the inclusion of an additional decay component in the likelihood function. The added decay component considers S-wave states of KK pairs in the Bs0 → J/[Psi] K+K- channel. The results are presented as 2-dimensional frequentist confidence regions for [beta]sJ/[Psi][Phi] and [Delta][Gamma] (the width difference between the Bs0 mass eigenstates), and as a confidence interval for [beta]sJ/[Psi][Phi] of [0.02,0.52] U [1.08, 1.55] at the 68% confidence level. The measurement of the CP violating phase obtained in this thesis is complemented by the world's most precise measurement of the lifetime [tau]s = 1.53 ± 0.025 (stat.) ± 0.012 (syst.) ps and decay width difference [Delta][Gamma] = 0.075 ± 0.035 (stat.) ± 0.01 (syst.) ps-1 of the Bs0 meson, with the assumption of no CP violation.
Cp Violation In B S 0 J Psi Phi Decays
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Author : Sabato Leo
language : en
Publisher: Springer
Release Date : 2014-07-24
Cp Violation In B S 0 J Psi Phi Decays written by Sabato Leo and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-07-24 with Science categories.
This thesis reports on the final measurement of the flavor-mixing phase in decays of strange-bottom mesons (B_s) into J/psi and phi mesons performed in high-energy proton-antiproton collisions recorded by the Collider Experiment at Fermilab. Interference occurs between direct decays and decays following virtual particle-antiparticle transitions (B_s-antiB_s). The phase difference between transition amplitudes (“mixing phase”) is observable and extremely sensitive to contributions from non-standard-model particles or interactions that may be very hard to detect otherwise – a fact that makes the precise measurement of the B_s mixing phase one of the most important goals of particle physics. The results presented include a precise determination of the mixing phase and a suite of other important supplementary results. All measurements are among the most precise available from a single experiment and provide significantly improved constraints on the phenomenology of new particles and interactions.
Measurement Of Cp Violation In B S 0 To J Psi Phi Decays Using The Full Cdf Data Set
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Author :
language : en
Publisher:
Release Date : 2013
Measurement Of Cp Violation In B S 0 To J Psi Phi Decays Using The Full Cdf Data Set 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.
We report on the final measurement of the CP-violating $B_s^0$ mixing phase $\beta_s^{J/[psi][phi]}$ in √s = 1.96 TeV proton-antiproton collisions collected with the Collider Detector at the Fermilab Tevatron collider. Using a sample corresponding to 9.6 fb-1 of integrated luminosity, we fit the decay-time evolution of $B_s^0$ → J/[psi] (→ [mu]+ [mu]-) [phi] (→ K+ K−) decays in which the b-quark content at production and the CP parity of the final state are identified. The interference of decays with and without mixing renders the $B_s^0$ mixing phase observable. The phase is determined to be -0.06
Measurement Of The Cp Violating Phase Boldsymbol Sin 2 Beta S Using Boldsymbol B 0 S Rightarrow J Psi Phi Decays At Cdf
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Author :
language : en
Publisher:
Release Date : 2010
Measurement Of The Cp Violating Phase Boldsymbol Sin 2 Beta S Using Boldsymbol B 0 S Rightarrow J Psi Phi Decays 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 2010 with categories.
A B0 s meson can oscillate into its anti-particle, the $ar{B}$0 s meson, before decaying. CP violation in this system is made possible by the presence of amplitudes from both mixed and unmixed B0 s meson decays. The CP violating phase ?s appears in the interference between the decay amplitudes. The quantity sin(2?s) is expected to be small in the standard model. Thus, measuring a large value for sin(2?s) would be an unequivocal sign of new physics participation in the B0 s mixing loop diagram. In this thesis, we present a latest measurement of sin(2?s), using 5.2 fb-1 of data collected at CDF from p$ar{p}$ collisions at a center of mass energy of √s=1.96 TeV. A time-dependent angular analysis, with the production flavor of the B0 s meson identified with flavor tagging methods, is used to extract sin(2?s) from 6̃500 B0 s→ J/?? decays. Other parameters of interest, such as the B0 s lifetime and the decay width difference between the heavy and light B0 s mass eigenstates are determined to high precision. Also, the effect of potential contributions to the final state from B0 s → J/?f0 and B0 s→ J/?K+K- decays is considered for the first time. We present 68% and 95% confidence regions in the ?s plane. The probability that the observed central value is a fluctuation of the data from the standard model expected value of ?s is calculated to be 44%. The observed confidence region shows better agreement with the standard model prediction than previous measurements.
Measurement Of The Cp Violation Parameter Sin 2 Beta In B Sup 0 R Arrow J Psi K Sub S Sup 0 Decays
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Author :
language : en
Publisher:
Release Date : 2001
Measurement Of The Cp Violation Parameter Sin 2 Beta In B Sup 0 R Arrow J Psi K Sub S Sup 0 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 2001 with categories.
A sample of[approximately] 400 B[sub d][sup 0]/[bar B][sub d][sup 0][r-arrow] J/[psi]K[sub s][sup 0] decays collected in[bar p]p collisions by the CDF detector is used to directly measure the CP-violation parameter sin (2[beta]). They find sin(2[beta])= 0.79[sub[minus]0.44][sup+ 0.41], favoring the standard model expectation of a large CP violation in this B[sup 0] decay mode.
Measurement Of Beta S At Cdf
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Author :
language : en
Publisher:
Release Date : 2011
Measurement Of Beta S 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 2011 with categories.
The latest results for the measurement of the CP violating phase [beta]{sub s} in B{sub s}° 2!J/[Psi][phi] decays, from 5.2 fb−1 integrated luminosity of CDF data are presented. For the first time, this measurement includes the contribution of B{sub s}° 2!J/[Psi]KK− or B{sub s}° 2!J/[Psi]f0 events to the signal sample, where the f0 and non-resonant KK− are S-wave states. Additional improvements to the analysis include more than doubling the signal sample, improved selection and particle ID, and fully calibrated flavour tagging for the full dataset. Additionally, the world's most precise single measurements of the B{sub s}° lifetime, [tau]{sub s}, and width difference, [Delta][Gamma]{sub s} are given.
Cp Violation In B S 0 J Psi Phi Decays
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Author : Sabato Leo
language : en
Publisher: Springer
Release Date : 2014-08-07
Cp Violation In B S 0 J Psi Phi Decays written by Sabato Leo and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-08-07 with Science categories.
This thesis reports on the final measurement of the flavor-mixing phase in decays of strange-bottom mesons (B_s) into J/psi and phi mesons performed in high-energy proton-antiproton collisions recorded by the Collider Experiment at Fermilab. Interference occurs between direct decays and decays following virtual particle-antiparticle transitions (B_s-antiB_s). The phase difference between transition amplitudes (“mixing phase”) is observable and extremely sensitive to contributions from non-standard-model particles or interactions that may be very hard to detect otherwise – a fact that makes the precise measurement of the B_s mixing phase one of the most important goals of particle physics. The results presented include a precise determination of the mixing phase and a suite of other important supplementary results. All measurements are among the most precise available from a single experiment and provide significantly improved constraints on the phenomenology of new particles and interactions.
Study Of Cp Violation In B0s 2 J Psi Phi Decays At
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Author :
language : en
Publisher:
Release Date : 2008
Study Of Cp Violation In B0s 2 J Psi Phi Decays At 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.
In a universe dominated by matter, the source of CP violation may explain one of the greatest mysteries in particle physics: what happened to the antimatter? The Standard Model successfully describes CP violation in the B+ and Bd0 systems, yet insufficiently accounts for the observed matter-antimatter asymmetry. The Standard Model predicts a small value of CP violation in the Bs0 meson system, which has only recently been experimentally tested. A measurement of large, anomalous CP violation in the Bs0 system would be a clear indication of new physics sources beyond the Standard Model. This dissertation describes a study of CP violation in approximately 2000 Bs0 → J/[Psi][Phi] decays reconstructed in a 2.8 fb-1 data sample collected by the D0 Run II detector at Fermi National Accelerator Laboratory in Batavia, Illinois. This data was provided by p$\bar{p}$ collisions at √s = 1.96 TeV delivered by the Tevatron accelerator between April 2002 and August 2007. Flavor-tagged Bs0 → J/[Psi]([mu]+[mu]-)[Phi](K+K-) decays and an angular analysis are used to study the time evolution of the final state angular distributions. From this analysis, we measure the width difference between the heavy and light mass eigenstates, BsL and BsH , to be [Delta][Gamma]s = 0.19 ± 0.07 and the CP-violating phase [Phi]s = -0.57-0.30+0.24.
Measurement Of The Cp Violating Phase Phi S Using B 0 S J Psi Phi And B 0 S J Psi Pi Pi Decays With The Lhcb Experiment
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Author :
language : en
Publisher:
Release Date : 2013
Measurement Of The Cp Violating Phase Phi S Using B 0 S J Psi Phi And B 0 S J Psi Pi Pi Decays With The Lhcb 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 2013 with categories.