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Beta Flavor Tagging Calibration And Search For Beta Superscript 0 Subscript S Oscillations In Semileptonic Decays With The Cdf Detector At Fermilab
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Book Synopsis Beta Flavor Tagging Calibration and Search for Beta Superscript 0 Subscript S Oscillations in Semileptonic Decays with the CDF Detector at Fermilab by : Gavril A. Giurgiu
Download or read book Beta Flavor Tagging Calibration and Search for Beta Superscript 0 Subscript 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 0 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 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 Search for B0̂s Oscillations in Semileptonic B Decays by :
Download or read book Search for B0̂s Oscillations in Semileptonic B Decays written by and published by . This book was released on 2007 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: This note describes a search for B{sub s}° oscillations using semileptonic B decays recorded by the CDF detector during Run II of the Fermilab Tevatron Collider on about 1 fb−1 of data, as it was in April 2006. Opposite-side and same-side b flavor taggers are used in this analysis. First they measure the B° oscillation frequency and calibrate opposite-side b flavor taggers on a sample of semileptonic B decays. A simultaneous analysis of B° and B decays to lD°, lD+ and lD* final states has been performed. Beginning with tagger calibrations available from earlier analyses on the l + SVT samples, they use the high statistic lD sample to derive scale factors for predicted dilutions of the soft muon, soft electron and jet charge opposite-side taggers. Secondly they reconstruct B{sub s}° → l+D{sub s}−X decays in three different D{sub s}− channels, namely??−, K*° K− and?+?−?−. D mass, lepton-D mass and lifetime parameters for signal and backgrounds are determined with unbinned maximum likelihood fits. They validate their fitter and obtain sensitivity projections with toy Monte Carlo samples. The?m{sub s} sensitivity on the semileptonic sample is 17.3 ps−1. With the combination of the semileptonic and hadronic analyses they observe a signature consistent with B{sub s}° - {bar B}{sup s}° oscillations. The probability that random tags background could fluctuate to mimic such a signature is 0.5%. Under the hypothesis that this is a signal for B{sub s}° - {bar B}{sup s}° oscillations, they measure?m{sub s} = 17.31{sub -0.18}{sup -0.33}(stat.) ± 0.07(syst.) ps−1.
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 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 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 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 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 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 Search for B0(S) Anti-B0(S) Oscillations at SLD. by :
Download or read book Search for B0(S) Anti-B0(S) Oscillations at SLD. written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present preliminary results on the time dependence of B[sub s][sup 0] -[bar B][sub s][sup 0] and B[sub d][sup 0] -[bar B][sub d][sup 0] mixing using a sample of 400,000 hadronic Z[sup 0] decays collected by the SLD experiment at the SLC. The analyses take advantage of the excellent decay length resolution of the CCD vertex detector. The B or[bar B] production flavor is determined by exploiting the large forward-backward asymmetry of polarized Z[sup 0][yields] b[bar b] decays. This flavor tag is enhanced by incorporating additional information from the hemisphere opposite that of the reconstructed B decay. The B[sub d][sup 0] -[bar B][sub d][sup 0] mixing analysis uses the charge of high momentum kaons to identify the B or[bar B] decay flavor. The result is[Delta]m[sub d]= 0.503[+-] 0.028(stat)[+-] 0.020(syst) ps[sup -1]. The results of three separate B[sub s][sup 0] -[bar B][sub s][sup 0] mixing analyses are presented. These analyses determine the B decay flavor using the lepton charge in B semileptonic decays, the charge of fully reconstructed D[sub s] decays, and the charge difference between topologically reconstructed B and D decays. The three analyses are combined to set a lower limit on the B[sub s][sup 0] -[bar B][sub s][sup 0] oscillation frequency of 12.0 ps[sup -1] at 95% CL.
Book Synopsis Flavour Tagging Calibration and Measurement of Bs Oscillations and CP Asymmetry by : Jan Morlock
Download or read book Flavour Tagging Calibration and Measurement of Bs Oscillations and CP Asymmetry written by Jan Morlock and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Kalibration Neuer 'flavor-tagging'-Algorithmen Mittels B_1tns-Oszillationen by :
Download or read book Kalibration Neuer 'flavor-tagging'-Algorithmen Mittels B_1tns-Oszillationen written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for D[sup 0]-[bar D][sup 0] Mixing Using Semileptonic Decay Modes by :
Download or read book Search for D[sup 0]-[bar D][sup 0] Mixing Using Semileptonic Decay Modes written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on an 87-fb[sup -1] dataset collected by the BABAR detector at the PEP-II asymmetric-energy B-Factory, a search for D[sup 0]-[bar D][sup 0] mixing has been made using the semileptonic decay modes D*[sup +] --> [pi][sup +] D[sup 0][sub z] D[sup 0] --> K*[epsilon][nu] (+c.c.). The use of these modes allows unambiguous flavor tagging and a combined fit of the D[sup 0] decay time and D*[sup +]-D[sup 0] mass difference ([Delta]M) distributions. The high-statistics sample of unmixed semileptonic D[sup 0] decays is used to model the [Delta]M distribution and time-dependence of mixed events directly from the data. Neural networks are used to select events and reconstruct the D[sup 0]. A result consistent with no charm mixing has been obtained. R[sub mix] = 0.0023 [+-] 0.0012 [+-] 0.0004. This corresponds to an upper limit of R[sub mix]
Book Synopsis Heavy Flavor Decays of the Z0 and a Search for Flavor Changing Neutral Currents by :
Download or read book Heavy Flavor Decays of the Z0 and a Search for Flavor Changing Neutral Currents written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented here are the results of a direct search for flavor changing neutral currents via the rare process Z[sup 0] [yields] bs and a measurement of R[sub bs] = [Lambda](Z[sup 0] [yields] bs)/[Lambda](Z[sup 0] [yields] hadrons). Because the decays Z[sup 0] [yields] b[bar b] and Z[sup 0] [yields] c[bar c] contribute significant backgrounds to Z[sup 0] [yields] bs, simultaneous measurements of R[sub b] = [Lambda](Z[sup 0] [yields] b[bar b])/[Lambda](Z[sup 0] [yields] hadrons) and R[sub c] = [Lambda](Z[sup 0] [yields] c[bar c])/[Lambda](Z[sup 0] [yields] hadrons) were also made. The standard double tag technique was extended and self calibrating tags were used for s, c, and b quarks. These measurements were made possible by the unique capabilities of the SLAC Large Detector (SLD) at the Stanford Linear Accelerator Center (SLAC): The b and c tags relied upon the SLD's VXD3 307 megapixel CCD vertex detector for topological and kinematic reconstruction of the B and D decay vertices; the s tag identified K[sup [+-]] mesons using the particle identification capabilities of SLD's Cherenkov Ring Imaging Detector (CRID), and K[sub S][sup 0] mesons and [Lambda] hadrons by kinematic reconstruction of their decay vertices in SLD's 5120 channel central drift chamber (CDC) particle tracking system.
Book Synopsis Study of Flavor Tagging with Semi-exclusive Reconstruction of B [right Arrow] D(sigma)X Decays by : Elizabeth Sara Ptacek
Download or read book Study of Flavor Tagging with Semi-exclusive Reconstruction of B [right Arrow] D(sigma)X Decays written by Elizabeth Sara Ptacek and published by . This book was released on 2005 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: The BaBar experiment measures CP violation in the B meson system by analyzing the decays of B0B̄0 pairs in which one of the mesons decays into a CP eigenstate. By measuring the decay time distribution separately for B0 and B̄0 decays the CP violating asymmetry and sin 2[beta] can be measured. In order to measure the decay time distribution for the B0 and B̄0 decays, it is necessary to identify the flavor, or tag, of the second B meson. The flavor of the B meson is identified by an algorithm which analyzes physical processes which carry flavor information from its decay. Analyzing new physical processes could potentially improve the efficiency of the tagging algorithm. I tested the effect of adding subtaggers which estimated the flavor of the tag B based on the flavor or the charge of its D0 or Ds daughters. However due to the low yields and high backgrounds of reconstructed D0 and Ds candidates, these subtaggers were not effective at making a net contribution to the tagging process.
Book Synopsis Flavour Tagging Calibration and Measurement of B_1tns Oscillations and CP Asymmetry by : Jan Morlock
Download or read book Flavour Tagging Calibration and Measurement of B_1tns Oscillations and CP Asymmetry written by Jan Morlock and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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