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Measurement Of Direct Cp Violation Parameters In Bpm To J Psi Kpm And Bpm To J Psi Pipm Decays With 104 Fb 1 Of Tevatron Data
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Book Synopsis 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 by :
Download or read book 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 published by . This book was released on 2013 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study of Direct CP Violation in B+- ---] J/psi K+- (pi+- ) File Decays by :
Download or read book Study of Direct CP Violation in B+- ---] J/psi K+- (pi+- ) File Decays written by and published by . This book was released on 2008 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a search for direct CP violation in B{sup ±} 2!J/[psi]K{sup ±}[pi]{sup ±} decays. The event sample is selected from 2.8 fb−1 of p{bar p} collisions recorded by D0 experiment in Run II of the Fermilab Tevatron Collider. The charge asymmetry A{sub CP}(B 2!J/[psi]K) = +0.0075 ± 0.0061(stat.) {+-} 0.0027(syst.) is obtained using a sample of approximately 40 thousand B{sup {+-}} 2!J/[psi]K{sup {+-}} decays. The achieved precision is of the same level as the expected deviation predicted by some extensions of the standard model. They also measured the charge asymmetry A{sub CP}(B+ 2!J/[psi][pi]+) = -0.09 {+-} 0.08(stat.){+-}0.03(syst.).
Book Synopsis CP Violation in {B_s}^0 -> J/psi.phi Decays by : Sabato Leo
Download or read book CP Violation in {B_s}^0 -> J/psi.phi Decays written by Sabato Leo and published by Springer. This book was released on 2014-07-24 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Measurement of CP Violation in $B_s^0\to J/\psi \phi$ Decays Using the Full CDF Data Set by :
Download or read book Measurement of CP Violation in $B_s^0\to J/\psi \phi$ Decays Using the Full CDF Data Set written by and published by . This book was released on 2013 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Book Synopsis Measurement of the CP-Violating Phase Beta_s in B0s -] J/Psi Phi Decays with the CDF II Detector by :
Download or read book Measurement of the CP-Violating Phase Beta_s in B0s -] J/Psi Phi Decays with the CDF II Detector written by and published by . This book was released on 2012 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 $1.009
Book Synopsis Measurement of the CP Violating Phase Beta_s in B_s-]J/psi Phi Decays by :
Download or read book Measurement of the CP Violating Phase Beta_s in B_s-]J/psi Phi Decays written by and published by . This book was released on 2010 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: The CP violating phase [beta] j/[Psi][Phi]s is measured in decays of B0s → J/[Psi][Phi]. This measurement uses 5.2 fb-1 of data collected in √s = 1.96 TeV p$\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.
Book Synopsis Measurement of CP Violation in Bo - J/[psi] KL Decays by : Sven Einar Vahsen
Download or read book Measurement of CP Violation in Bo - J/[psi] KL Decays written by Sven Einar Vahsen and published by . This book was released on 2003 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Branching Fraction And Search for Direct CP-Violation in the B+- --] J/Psi Pi+- Decay Mode at BaBar by : Francesco Fobozzi
Download or read book Measurement of the Branching Fraction And Search for Direct CP-Violation in the B+- --] J/Psi Pi+- Decay Mode at BaBar written by Francesco Fobozzi and published by . This book was released on 2006 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: The phenomenon of CP-violation in weak interactions, discovered in 1964 in decays of neutral kaons, receives a simple and elegant explanation in the Standard Model with three generations of quarks. Indeed, in this model the common source of CP-asymmetry phenomena is represented by a simple complex phase in the unitary matrix (the Cabibbo-Kobayashi-Maskawa matrix) describing the charged weak couplings of the quarks. This simple scheme has never received an accurate validation, because the phenomenological parameters determined from measurements of CP-violation in kaons decays are related to the fundamental parameters of the theory in a complex way, sensitive to large theoretical uncertainties. On the contrary, decays of neutral B mesons like B{sup 0} {yields} J/{psi} K{sub S}{sup 0} represent a unique laboratory to test the predictions of the theory because they are expected to show significant CP-violation effects, the magnitude of which is cleanly related to the Standard Model parameters. Thus experimental facilities have been built with the purpose of performing extensive studies of B decays. The BABAR experiment is operating at one of these facilities, at the Stanford Linear Accelerator Center. It is collecting data at the PEP-II asymmetric e{sup +}e{sup -} collider (E{sub e{sup -}} = 9.0 GeV; E{sub e{sup +}} = 3.1 GeV), a high-luminosity accelerator machine (L = 3 x 10{sup 33} cm{sup -2}s{sup -1}). The center-of-mass energy (10.58 GeV) of the e{sup +}e{sup -} system at PEP-II allows resonant production of the {Upsilon}(4S), a b{bar b} bound state, which decays almost exclusively in a B{sup 0}{bar B}{sup 0} or a B{sup +}B{sup -} pair. A high-acceptance detector, projected and built by a wide international collaboration, detects and characterizes the decay products of the B mesons. From the analysis of the data collected during the first two years of operation, the BABAR collaboration has established CP-violation in decays of neutral B mesons at the 4.1{sigma} level. Besides the primary goal of CP-violation studies, the high luminosity of PEP-II, coupled with the high acceptance of the BABAR detector, allows competitive studies of the properties of a wide set of B decay modes. In particular, measurements of non-leptonic decays are extremely useful to understand the dynamics of the non-perturbative strong interactions involved in these processes. In this thesis a study of the non-leptonic decay mode B{sup {+-}} {yields} J/{psi}{pi}{sup {+-}} is presented.
Book Synopsis Measurement of CP Parameters in B- --] D(pi+pi-pi0)K- and Study of the X(3872) in B --] J/psi Pi+ Pi- K with the BaBar Detector by : Frank Winklmeier
Download or read book Measurement of CP Parameters in B- --] D(pi+pi-pi0)K- and Study of the X(3872) in B --] J/psi Pi+ Pi- K with the BaBar Detector written by Frank Winklmeier and published by . This book was released on 2006 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents two analyses performed on data collected with the BABAR detector at the SLAC PEP-II e{sup +}e{sup -} asymmetric-energy B Factory. First, a Dalitz analysis is shown that performs the first measurement of CP violation parameters in the decay B{sup -} {yields} D{sub {pi}{sup +}{pi}{sup -}{pi}{sup 0}}K{sup -} using the decay rate asymmetry and D{sup 0} - {bar D}{sup 0} interference. The results can be used to further constrain the value of the CKM angle {gamma}. The second analysis studies the properties of the X(3872) in neutral and charged B {yields} J/{psi}{pi}{sup +}{pi}{sup -}K decays. Measurements of the branching ratio and mass are presented as well as the search for additional resonances at higher masses.
Book Synopsis First Flavor-Tagged Determination of Bounds on Mixing-Induced CP Violation in B^0_s --] J/psi Phi Decays by :
Download or read book First Flavor-Tagged Determination of Bounds on Mixing-Induced CP Violation in B^0_s --] J/psi Phi Decays written by and published by . This book was released on 2007 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Search for CP Violation in B0s to Jpsi Phi by :
Download or read book Search for CP Violation in B0s to Jpsi Phi written by and published by . This book was released on 2008 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: The CDF experiment, which uses p{bar p} collisions at √s = 1.9 TeV produced at the Fermilab Tevatron, is unique in its ability to observe all flavors of B hadrons and measure their properties. Among them, CP violation is of fundamental interest. In the B+ and B° systems, measurements of CP violation parameters performed essentially at B factories have borne out the predictions of CKM model. Little is known, experimentally, about CP violation in the B{sub s}° system. The standard model predicts very little CP violation there, thus any nonzero measurement could be an indication of new physics. In this thesis, we will report on the very first flavor-tagged analysis of approximately 2000 B{sub s}° → J/[psi][phi] decays reconstructed in a 1.35 fb−1 data sample collected at CDF. This channel is sensitive not only to the width difference [Delta][Lambda] in the B{sub s}° system but also to the CP violation parameter [beta]{sub s}. The final result we obtain is a confidence region in the two dimensional space of [beta]{sub s} and [Delta][Lambda]. Assuming the standard model predictions of [beta]{sub s} and [Delta][Lambda], the probability is 15%, corresponding to 1.5 Gaussian standard deviations.
Book Synopsis CP Violation Measurements at the Tevatron by :
Download or read book CP Violation Measurements at the Tevatron written by and published by . This book was released on 2010 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The two colliding beam experiments at the Tevatron proton-antiproton collider, CDF and D0, continue to publish world-leading measurements of CP Violation parameters in the B meson sector. I will present several recent results from both experiments, including measurements of direct CP violating parameters in decays of B{sub u}, B°{sub d} and B°{sub s} mesons; a new D0 measurement of a{sup s}{sub sl} using time-dependent analysis of B{sub s} →?+?D−{sub s}X decays; and the latest Tevatron combination of the CP violating phase?{sub s}, measured in the 'golden mode' B{sub s} → J/??
Book Synopsis Measurement of the CP Violation Parameter Sin(2[beta] in B[sup 0][r-arrow]J/[psi] K[sub S][sup 0] Decays by :
Download or read book 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 published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Time-Dependent CP Violation Measurements by : Markus Röhrken
Download or read book Time-Dependent CP Violation Measurements written by Markus Röhrken and published by Springer Science & Business Media. This book was released on 2013-10-17 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Lifetime Difference and CP Asymmetry in the Bs -] J/psi Phi Decay by :
Download or read book Lifetime Difference and CP Asymmetry in the Bs -] J/psi Phi Decay written by and published by . This book was released on 2007 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The B{sub s} meson is an interesting particle to study because a sizable mixing induced CP violation in the B{sub s} -- {bar B}{sub s} system would be an indication for physics beyond the Standard Model. In this paper we present a measurement of the lifetime difference [Delta][Gamma] between the B{sub s} mass eigenstates and the CP violating phase in the decay B{sub s} → J/[psi][phi]. In 1.7 fb−1 of data collected with the CDF II detector at the Tevatron p{bar p} collider we measure [Delta][Gamma] = 0.076{sup +0.059}{sub -0.063} (stat.) ±0.006 (syst.) ps−1, well consistent with the Standard Model prediction, and a mean B{sub s} lifetime of c{sub tau}{sub s} = 456 ± 13 (stat.) ± (syst.) [mu]m. We find no evidence for CP violation.
Book Synopsis Measurement of Time-dependent CP Violation in B0 2![eta]'K0 Decays by :
Download or read book Measurement of Time-dependent CP Violation in B0 2![eta]'K0 Decays written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of the time-dependent CP violation parameters in B0 2![eta]'K0 decays. The measurement is based on the full data sample containing 772×106 BB-bar pairs collected at the [Upsilon](4S) resonance using the Belle detector at the KEKB asymmetric-energy e+e- collider. The measured values of the mixing-induced and direct CP violation parameters are: sin 2[phi]1eff = +0.68 " 0.07 " 0.03, A[eta]'K0 = +0.03 " 0.05 " 0.04, where the first uncertainty is statistical and the second is systematic. The values obtained are the most accurate to date. Furthermore, these results are consistent with our previous measurements and with the world-average value of sin 2[phi]1 measured in B0 2!J/[psi]K0 decays.
Book Synopsis Measurements of the CP-violation Parameter Sin(2 Beta) in B[superscipt 0] [right Arrow] J/[psi]K[0 Over S] Decays by :
Download or read book Measurements of the CP-violation Parameter Sin(2 Beta) in B[superscipt 0] [right Arrow] J/[psi]K[0 Over S] Decays written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In the 110 pb[sup -1] Run I data sample, using three complementary flavor-tagging algorithms CDF has made a new measurement of the CP-violating asymmetry sin(2[beta])=0.79[sup +0.41][sub -0.44], This corresponds to the limit sin(2[beta])>-0.08 at 95% confidence level. This result agrees well with predictions from indirect constraints based on fits of elements of the CKM matrix.
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