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Observation Of B0s B 0s Oscillations And The Development And Application Of Same Side Kaon Flavor Tagging
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Book Synopsis Observation of B0s - B−0s Oscillations and the Development and Application of Same-side-kaon Flavor Tagging by : Alberto Belloni (Ph. D.)
Download or read book Observation of B0s - B−0s Oscillations and the Development and Application of Same-side-kaon Flavor Tagging written by Alberto Belloni (Ph. D.) and published by . This book was released on 2007 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: The search for flavor oscillations in the neutral Bs - B meson system constitutes a flagship analysis of the Tevatron proton-anti-proton collider physics program and an important probe for effects due to new physics beyond the Standard Model of particles and interactions. In particular, the precise measurement of a process such as Boscillations sets a strong constraint on the parameters of quark-flavor mixing in the Standard Model. This dissertation reports the analysis which, for the first time, observed B- Bs oscillations, using data collected with the CDF detector. The sub-percent precision of the measurement is also noteworthy. The data sample used for this analysis includes fully and partially reconstructed Bdecays: ... The focus of this thesis is the algorithm of same-side-kaon tagging which provides _-0 a large fraction of the flavor-tagging power available to this analysis of B- B8 oscillations. Flavor tagging consists in assessing whether a B, meson is creates as a B_--0 or a B, state, and constitutes an important ingredient in the analysis presented in this document. The algorithm which is here described combines particle identification information and kinematic characteristics of the Bevent in an artificial neural network to provide improved tagging power E'2 of about 4.0 - 4.8%, depending on the data sample to which the algorithm is applied. The search for B1 oscillations is performed using an amplitude method based on a frequency scanning procedure. Applying a neural network-based combination of lepton, kaon and jet charge opposite-side tagging algorithms, with a total tagging power of ED2 = 1.8%, and the same-side-kaon tagging algorithm to a data sample of 1 fb-1, a signal of B- B_ oscillations with a significance greater than 5 standard deviations is found ...
Book Synopsis Analysis of Bs Flavor Oscillations at CDF. by : Nuno T. Leonardo
Download or read book Analysis of Bs Flavor Oscillations at CDF. written by Nuno T. Leonardo and published by . This book was released on 2006 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: The search for and study of flavor oscillations in the neutral B{sub s}B{sub s} meson system is an experimentally challenging task. It constitutes a flagship analysis of the Tevatron physics program. In this dissertation, they develop an analysis of the time-dependent B{sub s} flavor oscillations using data collected with the CDF detector. The data samples are formed of both fully and partially reconstructed B meson decays: B{sub s} {yields} D{sub s}{pi}({pi}{pi}) and B{sub s} {yields} D{sub s}lv. A likelihood fitting framework is implemented and appropriate models and techniques developed for describing the mass, proper decay time, and flavor tagging characteristics of the data samples. The analysis is extended to samples of B{sup +} and B{sup 0} mesons, which are further used for algorithm calibration and method validation. The B mesons lifetimes are extracted. The measurement of the B{sup 0} oscillation frequency yields {Delta}m{sub d} = 0.522 {+-} 0.017 ps{sup -1}. The search for B{sub s} oscillations is performed using an amplitude method based on a frequency scanning procedure. Applying a combination of lepton and jet charge flavor tagging algorithms, with a total tagging power {epsilon}'D{sup 2} of 1.6%, to a data sample of 355 pb{sup -1}, a sensitivity of 13.0 ps{sup -1} is achieved. They develop a preliminary same side kaon tagging algorithm, which is found to provide a superior tagging power of about 4.0% for the B{sub s} meson species. A study of the dilution systematic uncertainties is not reported. From its application as is to the B{sub s} samples the sensitivity is significantly increased to about 18 ps{sup -1} and a hint of a signal is seen at about 175. ps{sup -1}. They demonstrate that the extension of the analysis to the increasing data samples with the inclusion of the same side tagging algorithm is capable of providing an observation of B{sub s} mixing beyond the standard model expectation. They show also that the improved knowledge of {Delta}m{sub s} has a considerable impact on constraining the CKM matrix elements.
Book Synopsis Analysis of B [sigma] Flavor Oscillations at CDF by : Nuno Teotónio Viegas Guerreiro Leonardo
Download or read book Analysis of B [sigma] Flavor Oscillations at CDF written by Nuno Teotónio Viegas Guerreiro Leonardo and published by . This book was released on 2006 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) In a preliminary study, we develop a same side kaon tagging algorithm, which is found to provide a superior tagging power, of about 4.0% for the B, meson species. An evaluation of the dilution systematic uncertainties is not reported but after including the algorithm as is in the analysis the sensistivity is significantly increased to about 18 ps-'. An indication of a B, oscillation signal is seen at a frequency of about 17.5 ps-1. We show that the extension of the analysis to the increasing data samples with the inclusion of the same side tagging algorithm is capable of providing an observation of B, mixing beyond the standard model expectation. We show also that the improved knowledge of Am, has a considerable impact on constraining the CKM matrix elements.
Book Synopsis Study of Bs Mixing at the CDFII Experiment with a Newly Developed Opposite Side B-flavour Tagging Algorithm Using Kaons by : Giuseppe Salamanna
Download or read book Study of Bs Mixing at the CDFII Experiment with a Newly Developed Opposite Side B-flavour Tagging Algorithm Using Kaons written by Giuseppe Salamanna and published by . This book was released on 2006 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes the development, calibration and performance evaluation of an Opposite-side b flavor tagger using K mesons at a p{bar p} hadron collider. In particular, this work is performed using data collected by the Collider Detector at Fermilab (CDF) during the Run II of the Tevatron hadron collider running at {radical}s = 1.96 TeV. b flavor tagging consists of the determination of the flavor of the b quark contained within a hadron. This information is vital to perform any time-dependent measurement involving flavor asymmetries in b hadron decays and flavor oscillations, where it is necessary to know whether a b or {bar b} was contained in a hadron when it was produced. Although at a hadron collider the biggest challenge is probably to perform an effective selection of interesting events in real time and with the best signal-to-background ratio, the statistical significance of any time-dependent measurement is proportional to the effectiveness with which the selected data sample is tagged.
Book Synopsis Observation of B^0_s -b-bar^0_s Oscillations by : A. Belloni
Download or read book Observation of B^0_s -b-bar^0_s Oscillations written by A. Belloni and published by . This book was released on 2006 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors report the observation of B{sub s}{sup 0} - {bar B}{sub s}{sup 0} oscillations using 1 fb{sup -1} of data from p{bar p} collisions with the CDF II detector at the Fermilab Tevatron. They measure the probability, as a function of proper decay time, that the B{sub s}{sup 0} decays with the same, or opposite, flavor as its flavor at production, which is determined using opposite-side and same-side flavor identification methods. They find a signal consistent with B{sub s}{sup 0} - {bar B}{sub s}{sup 0} oscillations, with a significance greater than 5{sigma}. They measure {Delta}m{sub s} = 17.77 {+-} 0.10(stat) {+-} 0.07(syst) ps{sup -1}.
Book Synopsis Calibration of New Flavor Tagging Algorithms Using Bs Oscillations by :
Download or read book Calibration of New Flavor Tagging Algorithms Using Bs Oscillations written by and published by . This book was released on 2007 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past decades the current theoretical description, the Standard Model of elementary particle physics, was solidified by many measurements as the basic theory describing fundamental particles and their interactions. It is extremely successful in explaining the high-precision data collected by experiments so far. The Standard Model includes several intrinsic parameters which have to be measured in experiments. Independent analyses of different physical processes can constrain those parameters. By combining those measurements physicists might be sensitive to physics beyond the Standard Model. If they are inconsistent it allows to get a hint on the theory that might supersede the Standard Model. The goal of the analysis presented in this thesis is to measure some of these parameters in the B{sub s} meson system. The B{sub s} meson, consisting of an anti-b and s quark, is not a pure mass eigenstate, thus allowing a B{sub s} meson to oscillate into its antiparticle via weak interacting processes. This is a general feature of any neutral meson. The history of meson mixing measurements is more then 50 years old. It was first observed in the kaon system. The oscillation in the B{sub d} system was measured very precisely by the B factories, whereas the oscillation frequency of the Bs was measured with more than 5[sigma] significance last year by CDF and first evidence for mixing in the D0 system was presented only this year.
Book Synopsis Rechnungsbericht der Stadt Warschau by :
Download or read book Rechnungsbericht der Stadt Warschau written by and published by . This book was released on 1941 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis B Flavor Tagging Calibration and Search for B(s) Oscillations in Semileptonic Decays with the CDF Detector at Fermilab by : Gavril A. Giurgiu
Download or read book B Flavor Tagging Calibration and Search for B(s) Oscillations in Semileptonic Decays with the CDF Detector at Fermilab written by Gavril A. Giurgiu and published by . This book was released on 2005 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis we present a search for oscillations of B{sub s}{sup 0} mesons using semileptonic B{sub s}{sup 0} {yields} D{sub s}{sup -}{ell}{sup +}{nu} decays. Data were collected with the upgraded Collider Detector at Fermilab (CDFII) from events produced in collisions of 980 GeV protons and antiprotons accelerated in the Tevatron ring. The total proton-antiproton center-of-mass energy is 1.96 TeV. The Tevatron is the unique source in the world for B{sub s}{sup 0} mesons, to be joined by the Large Hadron Collider at CERN after 2007. We establish a lower limit on the B{sub s}{sup 0} oscillation frequency {Delta}m{sub s}> 7.7 ps{sup -1} at 95% Confidence Level. We also present a multivariate tagging algorithm that identifies semileptonic B {yields} {mu}X decays of the other B mesons in the event. Using this muon tagging algorithm as well as opposite side electron and jet charge tagging algorithms, we infer the B{sub s}{sup 0} flavor at production. The tagging algorithms are calibrated using high statistics samples of B{sup 0} and B{sup +} semileptonic B{sup 0/+} {yields} D{ell}{nu} decays. The oscillation frequency {Delta}m{sub d} in semileptonic B{sup 0} {yields} D{ell}{nu} decays is measured to be {Delta}m{sub d} = (0.501 {+-} 0.029(stat.) {+-} 0.017(syst.)) ps{sup -1}.
Book Synopsis Flavor Physics for the Millennium by : Jonathan L. Rosner
Download or read book Flavor Physics for the Millennium written by Jonathan L. Rosner and published by World Scientific. This book was released on 2001 with total page 890 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is devoted to the broad subject of flavor physics, embracing the question of what distinguishes one type of elementary particles from another. The articles range from the forefront of formal theory (treating the physics of extra dimensions) to details of particle detectors. Although special emphasis is placed on the physics of kaons, charmed and beauty particles, top quarks, and neutrinos, the articles also dealing with electroweak physics, quantum chromodynamics, supersymmetry, and dynamical electroweak symmetry breaking. Violations of fundamental symmetries such as time reversal invariance are discussed in the context of neutral kaons, beauty particles, electric dipole moments, and parity violation in atoms. The physics of the CabibboOCoKobayashiOCoMaskawa matrix and of quark masses are described in some detail, both from the standpoint of present and future experimental knowledge and from a more fundamental viewpoint, where physicists are still searching for the correct theory. Contents: The Electroweak Theory (C Quigg); CP Violation (L Wolfenstein); Precision Electroweak Physics (Y-K Kim); Kaon and Charm Physics: Theory (G Buchalla); Kaon Physics: Experiments (T Barker); The Status of Mixing in the Charm Sector (J P Cumalat); Basics of QCD Perturbation Theory (D E Soper); Lattice QCD and the CKM Matrix (T DeGrand); The Strong CP Problem (M Dine); A Bibliography of Atomic Parity Violation and Electric Dipole Moment Experiments (C E Wieman); The CKM Matrix and the Heavy Quark Expansion (A F Falk); CP Violation in B Decays (J L Rosner); Lectures on the Theory of Nonleptonic B Decays (M Neubert); Asymmetrical e Collisions (A Roodman); Pathological Science (S Stone); Top Physics (E H Simmons); Neutrino Mass, Mixing, and Oscillation (B Kayser); Flavor in Supersymmetry (H Murayama); Technicolor and Compositeness (R S Chivukula); Models of Fermion Masses (G G Ross); Physics of Extra Dimensions (J D Lykken). Readership: Graduate students, postdoctoral fellows and senior researchers in high energy physics."
Book Synopsis Measurement of B0-anti-B0 Flavor Oscillations in Hadronic B0 Decays by :
Download or read book Measurement of B0-anti-B0 Flavor Oscillations in Hadronic B0 Decays written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Flavor oscillations of neutral B mesons have been studied in e[sup+]e[sup -] annihilation data collected with the BABAR detector at center-of-mass energies near the[Upsilon](4S) resonance. The data sample used for this purpose consists of events in which one B[sup 0] meson is reconstructed in a hadronic decay mode, while the flavor of the recoiling B[sup 0] is determined with a tagging algorithm that exploits the correlation between the flavor of the heavy quark and the charges of its decay products. From the time development of the observed mixed and unmixed final states we determine the B[sup 0]-[bar B][sup 0] oscillation frequency[Delta]m[sub d] to be 0.516[+-] 0.016(stat)[+-] 0.010(syst) ps[sup -1].
Book Synopsis Measurement of B°/Bbar° {right Arrow}J/[psi] K(0 Over S) Decay Asymmetry Using Same-side B-flavor Tagging by :
Download or read book Measurement of B°/Bbar° {right Arrow}J/[psi] K(0 Over S) Decay Asymmetry Using Same-side B-flavor Tagging written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of the time-dependent asymmetry in the rate for {anti B}° versus B° decays to J/[psi]K°{sub s}. The data sample consists of 198 ± 17 B°/{anti B}° decays collected by the CDF detector in p{anti p} collisions at the Fermilab Tevatron, where the initial b flavor has been determined by a same-side flavor tagging technique. This asymmetry is interpreted in the Standard Model as a measurement of the CP-violation parameter sin(2[beta]). Our analysis results in sin(2[beta]) = 1:8 ± 1:1(stat) ± 0:3(syst).
Book Synopsis Measurement of B[sup 0]/Bbar[sup 0] [right Arrow]J/[psi] K(0 Over S) Decay Asymmetry Using Same-side B-flavor Tagging by :
Download or read book Measurement of B[sup 0]/Bbar[sup 0] [right Arrow]J/[psi] K(0 Over S) Decay Asymmetry Using Same-side B-flavor Tagging written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of the time-dependent asymmetry in the rate for [anti B][sup 0] versus B[sup 0] decays to J/[psi]K[sup 0][sub s]. The data sample consists of 198 [+-] 17 B[sup 0]/[anti B][sup 0] decays collected by the CDF detector in p[anti p] collisions at the Fermilab Tevatron, where the initial b flavor has been determined by a same-side flavor tagging technique. This asymmetry is interpreted in the Standard Model as a measurement of the CP-violation parameter sin(2[beta]). Our analysis results in sin(2[beta]) = 1:8 [+-] 1:1(stat) [+-] 0:3(syst).
Book Synopsis Flavour Tagging Calibration and Measurement of Bs Oscillations and CP Asymmetry by :
Download or read book Flavour Tagging Calibration and Measurement of Bs Oscillations and CP Asymmetry written by and published by . This book was released on 2010 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: The eld of particle physics explores elementary constituents of matter and interactions between them. During the last century remarkable achievements were made in this eld - smaller and smaller objects could be resolved. In this sense, the research objects gradually shifted from molecules over atoms and nucleons to point-like particles, which are assumed to be elementary. Interactions between these constituents are mediated by four fundamental forces. Three of them are described by the Standard Model of Particle Physics. Judged by its ability to describe observations and its capability to make predictions, this model is extremely successful. According to the standard model the constituents of matter are quarks and leptons. Both groups consist of six di erent species, so called avours, which may appear as particle or anti-particle. Quarks never appear as free particles. Only bound states of quark and anti-quark, called mesons, and three quarks, called baryons, are observed. The proton, for example, is composed of two up (u) and one down (d) quark. The focal point of this thesis is the B$0\atop{s}$ meson. In a nutshell, the thesis at hand has two aims: the first one is to calibrate a tagger using B$0\atop{s}$ oscillations and the second one is to improve the result (equation 1.1) on the mixing frequency itself.
Book Synopsis B Flavor Tagging Calibration and Search for B$0\atop{s}$ Oscillations in Semileptonic Decays with the CDF Detector at Fermilab by :
Download or read book B Flavor Tagging Calibration and Search for B$0\atop{s}$ Oscillations in Semileptonic Decays with the CDF Detector at Fermilab written by and published by . This book was released on 2005 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis we present a search for oscillations of B$0top{s}$ mesons using semileptonic B$0top{s}$ → D$-top{s}$l+v decays. Data were collected with the upgraded Collider Detector at Fermilab (CDFII) from events produced in collisions of 980 GeV protons and antiprotons accelerated in the Tevatron ring. The total proton-antiproton center-of-mass energy is 1.96 TeV. The Tevatron is the unique source in the world for B$0top{s}$ mesons, to be joined by the Large Hadron Collider at CERN after 2007. We establish a lower limit on the B$0top{s}$ oscillation frequency ?ms > 7.7 ps-1 at 95% Confidence Level. We also present a multivariate tagging algorithm that identifies semileptonic B → ?X decays of the other B mesons in the event. Using this muon tagging algorithm as well as opposite side electron and jet charge tagging algorithms, we infer the B$0top{s}$ flavor at production. The tagging algorithms are calibrated using high statistics samples of B0 and B+ semileptonic B0/+ → Dlv decays. The oscillation frequency ?md in semileptonic B0 → Dlv decays is measured to be ?md = (0.501 ± 0.029(stat.) ± 0.017(syst.)) ps-1.
Book Synopsis Preliminary Measurements of the Time Dependence of B[sub D][sup 0] -[bar B][sub D][sup 0] Mixing with Kaon and Charge Dipole Tags by :
Download or read book Preliminary Measurements of the Time Dependence of B[sub D][sup 0] -[bar B][sub D][sup 0] Mixing with Kaon and Charge Dipole Tags written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report two preliminary measurements of the time dependence of B[sub d][sup 0]- B[sub d][sup 0] mixing using novel techniques with a sample of 150,000 hadronic Z[sup O] decays collected by the SLD experiment at the SLC. B decay vertices are reconstructed inclusively with a topological technique and the B hadron flavor at production is determined by exploiting the large left-right forward-backward asymmetry of Z[sup O][r-arrow] b[bar b] decays in combination with a jet charge technique. Two methods are used to tag the B flavor at decay. The first uses the charge of kaons attached to the B decay vertex and identified with the Cherenkov Ring Imaging Detector. The second measurement is based on the construction of a charge dipole of the topological vertices to separate the B[sub d][sup O]/B[sub d][sup 0] decays by exploiting the B[r-arrow] D cascade charge structure. The measurement of the oscillation frequency yields[Delta]m[sub d]= 0.58[+-] 0.07(stat)[+-]0.08(syst) ps[sup -1] and 0.56[+-] 0.08(stat)[+-]0.04(syst) ps[sup[minus]1] for the kaon and dipole tags respectively.
Book Synopsis A Measurement of B0 Anti-B0 Oscillations Using Fully-Reconstructed Hadronic B Decays at BABAR. by :
Download or read book A Measurement of B0 Anti-B0 Oscillations Using Fully-Reconstructed Hadronic B Decays at BABAR. written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Flavor oscillations of neutral B mesons have been studied with e[sup +]e[sup -] annihilation data collected at center of mass energies near the [Upsilon](4S) at the PEP-II asymmetric collider with the BABAR detector. One B[sup 0] is fully reconstructed in a hadronic decay to a flavor eigenstate. The flavor of the other B in the event is determined using an inclusive tagging algorithm which exploits the correlations between the flavor of the b quark and the charges of its decay products. By fitting the decay-time distribution of the observed mixed and unmixed final states, the oscillation frequency, [Delta]m[sub d], is determined to be 0.516 [+-] 0.016(stat.) [+-] 0.010(syst.) ps[sup -1].
Book Synopsis A Measurement of B0 Anti-B0 Oscillations Using Fully-reconstructed Hadronic B Decays at BaBar by : Benjamin Paul Brau
Download or read book A Measurement of B0 Anti-B0 Oscillations Using Fully-reconstructed Hadronic B Decays at BaBar written by Benjamin Paul Brau and published by . This book was released on 2002 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flavor oscillations of neutral B mesons have been studied with e+e- annihilation data collected at center of mass energies near the [gamma](4S) at the PEP-II asymmetric collider with the BABAR detector. One B0 is fully reconstructed in a hadronic decay to a flavor eigenstate. The flavor of the other B in the event is determined using an inclusive tagging algorithm which exploits the correlations between the flavor of the b quark and the charges of its decay products. By fitting the decay-time distribution of the observed mixed and unmixed final states, the oscillation frequency, [Delta]md, is determined to be 0.516 +/- 0.016 (stat.) +/- 0.010 (syst.) ps-l.
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