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Measurement Of The Top Quark Mass By Dynamical Likelihood Method Using The Dilepton Events With The Collider Detector At Fermilab
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Book Synopsis Measurement of the Top Quark Mass by Dynamical Likelihood Method Using the Dilepton Events with the Collider Detector at Fermilab by : 土屋亮
Download or read book Measurement of the Top Quark Mass by Dynamical Likelihood Method Using the Dilepton Events with the Collider Detector at Fermilab written by 土屋亮 and published by . This book was released on 2006 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Top Quark Mass by Dynamical Likelihood Method Using the Lepton + Jets Events with the Collider Detector at Fermilab by :
Download or read book Measurement of the Top Quark Mass by Dynamical Likelihood Method Using the Lepton + Jets Events with the Collider Detector at Fermilab written by and published by . This book was released on 2008 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have measured the top quark mass with the dynamical likelihood method. The data corresponding to an integrated luminosity of 1.7fb−1 was collected in proton antiproton collisions at a center of mass energy of 1.96 TeV with the CDF detector at Fermilab Tevatron during the period March 2002-March 2007. We select t{bar t} pair production candidates by requiring one high energy lepton and four jets, in which at least one of jets must be tagged as a b-jet. In order to reconstruct the top quark mass, we use the dynamical likelihood method based on maximum likelihood method where a likelihood is defined as the differential cross section multiplied by the transfer function from observed quantities to parton quantities, as a function of the top quark mass and the jet energy scale(JES). With this method, we measure the top quark mass to be 171.6 ± 2.0 (stat.+ JES) ± 1.3(syst.) = 171.6 ± 2.4 GeV/c2.
Book Synopsis Measurement of the Top Quark Mass by Dynamical Likelihood Method Using the Lepton Plus Jets Events in 1.96 Tev Proton-Antiproton Collisions by : Kohei Yorita
Download or read book Measurement of the Top Quark Mass by Dynamical Likelihood Method Using the Lepton Plus Jets Events in 1.96 Tev Proton-Antiproton Collisions written by Kohei Yorita and published by . This book was released on 2005 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have measured the top quark mass with the dynamical likelihood method (DLM) using the CDF II detector at the Fermilab Tevatron. The Tevatron produces top and anti-top pairs in pp collisions at a center of mass energy of 1.96 TeV. The data sample used in this paper was accumulated from March 2002 through August 2003 which corresponds to an integrated luminosity of 162 pb-1.
Book Synopsis Measurement of the Top Quark Mass with the Dynamical Likelihood Method Using Lepton Plus Jets Events with B-tags in P Anti-p Collisions at S**ư by :
Download or read book Measurement of the Top Quark Mass with the Dynamical Likelihood Method Using Lepton Plus Jets Events with B-tags in P Anti-p Collisions at S**ư written by and published by . This book was released on 2005 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes a measurement of the top quark mass, M{sub top}, with the dynamical likelihood method (DLM) using the CDF II detector at the Fermilab Tevatron. The Tevatron produces top/anti-top (t{bar t}) pairs in p{bar p} collisions at a center-of-mass energy of 1.96 TeV. The data sample used in this analysis was accumulated from March 2002 through August 2004, which corresponds to an integrated luminosity of 318 pb−1. They use the t{bar t} candidates in the ''lepton+jets'' decay channel, requiring at least one jet identified as a b quark by finding an displaced secondary vertex. The DLM defines a likelihood for each event based on the differential cross section as a function of M{sub top} per unit phase space volume of the final partons, multiplied by the transfer functions from jet to parton energies. The method takes into account all possible jet combinations in an event, and the likelihood is multiplied event by event to derive the top quark mass by the maximum likelihood method. Using 63 t{bar t} candidates observed in the data, with 9.2 events expected from background, they measure the top quark mass to be 173.2{sub -2.4}{sup +2.6}(stat.) ± 3.2(syst.) GeV/c2, or 173.2{sub -4.0}{sup +4.1} GeV/c2.
Book Synopsis Measurement of the Top Quark Mass with the Dynamical Likelihood Method Using Lepton Plus Jets Events with B-tags in P Anti-p Collisions at S**1/2 by :
Download or read book Measurement of the Top Quark Mass with the Dynamical Likelihood Method Using Lepton Plus Jets Events with B-tags in P Anti-p Collisions at S**1/2 written by and published by . This book was released on 2005 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes a measurement of the top quark mass, M{sub top}, with the dynamical likelihood method (DLM) using the CDF II detector at the Fermilab Tevatron. The Tevatron produces top/anti-top (t{bar t}) pairs in p{bar p} collisions at a center-of-mass energy of 1.96 TeV. The data sample used in this analysis was accumulated from March 2002 through August 2004, which corresponds to an integrated luminosity of 318 pb−1. They use the t{bar t} candidates in the ''lepton+jets'' decay channel, requiring at least one jet identified as a b quark by finding an displaced secondary vertex. The DLM defines a likelihood for each event based on the differential cross section as a function of M{sub top} per unit phase space volume of the final partons, multiplied by the transfer functions from jet to parton energies. The method takes into account all possible jet combinations in an event, and the likelihood is multiplied event by event to derive the top quark mass by the maximum likelihood method. Using 63 t{bar t} candidates observed in the data, with 9.2 events expected from background, they measure the top quark mass to be 173.2{sub -2.4}{sup +2.6}(stat.) ± 3.2(syst.) GeV/c2, or 173.2{sub -4.0}{sup +4.1} GeV/c2.
Book Synopsis Measurement of the Top Quark Mass by Application of the Dalitz-Goldstein Method to Dilepton Events by : Kristo Michael Karr
Download or read book Measurement of the Top Quark Mass by Application of the Dalitz-Goldstein Method to Dilepton Events written by Kristo Michael Karr and published by . This book was released on 1999 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents a measurement of the top quark mass by application of the Dalitz-Goldstein method to dilepton tt ̄ events. The events were produced by the Tevatron Collider at Fermi National Accelerator Laboratory (Fermilab) via pp ̄ collisions with s = 1.8 TeV. The dilepton event sample was extracted from 109 pb --1 of data collected by the Collider Detector at Fermilab (CDF) from August 1992 to July 1995. The sample contains a total of 9 candidate events, 2.4 of which are expected from background. Included in the dilepton final state are two neutrinos, which elude detection. This analysis constrains the problem by assuming an initial value for the top quark mass and solving for the neutrino momenta via a geometrical construction developed by D. H. Dalitz and G. Goldstein. The top quark mass is sampled over a wide range of possible values and the most likely mass consistent with the data is chosen via a likelihood function. An important distinguishing feature of this mass fitting technique is its lack of dependence on missing transverse energy, a kinematic variable that is poorly measured by experiment. This analysis determines the top quark mass to be Mtop = 157.1 +/- 10.9(stat.) +/- 4.33.7 (syst.) GeV/c2.
Book Synopsis Measurement of the Top Quark Mass in the Dilepton Final State Using the Matrix Element Method by :
Download or read book Measurement of the Top Quark Mass in the Dilepton Final State Using the Matrix Element Method written by and published by . This book was released on 2008 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: The top quark, discovered in 1995 by the CDF and D0 experiments at the Fermilab Tevatron Collider, is the heaviest known fundamental particle. The precise knowledge of its mass yields important constraints on the mass of the yet-unobserved Higgs boson and allows to probe for physics beyond the Standard Model. The first measurement of the top quark mass in the dilepton channel with the Matrix Element method at the D0 experiment is presented. After a short description of the experimental environment and the reconstruction chain from hits in the detector to physical objects, a detailed review of the Matrix Element method is given. The Matrix Element method is based on the likelihood to observe a given event under the assumption of the quantity to be measured, e.g. the mass of the top quark. The method has undergone significant modifications and improvements compared to previous measurements in the lepton+jets channel: the two undetected neutrinos require a new reconstruction scheme for the four-momenta of the final state particles, the small event sample demands the modeling of additional jets in the signal likelihood, and a new likelihood is designed to account for the main source of background containing tauonic Z decay. The Matrix Element method is validated on Monte Carlo simulated events at the generator level. For the measurement, calibration curves are derived from events that are run through the full D0 detector simulation. The analysis makes use of the Run II data set recorded between April 2002 and May 2008 corresponding to an integrated luminosity of 2.8 fb−1. A total of 107 t{bar t} candidate events with one electron and one muon in the final state are selected. Applying the Matrix Element method to this data set, the top quark mass is measured to be m{sub top}{sup Run IIa} = 170.6 ± 6.1(stat.){sub -1.5}{sup +2.1}(syst.)GeV; m{sub top}{sup Run IIb} = 174.1 ± 4.4(stat.){sub -1.8}{sup +2.5}(syst.)GeV; m{sub top}{sup comb} = 172.9 ± 3.6(stat.) ± 2.3(syst.)GeV. Systematic uncertainties are discussed, and the results are interpreted within the Standard Model of particle physics. As the main systematic uncertainty on the top quark mass comes from the knowledge of the absolute jet energy scale, studies for a simultaneous measurement of the top quark mass and the b jet energy scale are presented. The prospects that such a simultaneous determination offer for future measurements of the top quark mass are outlined.
Book Synopsis Measurement of the Top Quark Mass Using Template Methods on Dilepton Events in P Anti-p Collisions at S**1/2 by :
Download or read book Measurement of the Top Quark Mass Using Template Methods on Dilepton Events in P Anti-p Collisions at S**1/2 written by and published by . This book was released on 2006 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors describe a measurement of the top quark mass from events produced in p{bar p} collisions at a center-of-mass energy of 1.96 TeV, using the Collider Detector at Fermilab. They identify t{bar t} candidates where both W bosons from the top quarks decay into leptons (e[nu], [mu][nu], or [tau][nu]) from a data sample of 360 pb−1. The top quark mass is reconstructed in each event separately by three different methods, which draw upon simulated distributions of the neutrino pseudorapidity, t{bar t} longitudinal momentum, or neutrino azimuthal angle in order to extract probability distributions for the top quark mass. For each method, representative mass distributions, or templates, are constructed from simulated samples of signal and background events, and parameterized to form continuous probability density functions. A likelihood fit incorporating these parameterized templates is then performed on the data sample masses in order to derive a final top quark mass. Combining the three template methods, taking into account correlations in their statistical and systematic uncertainties, results in a top quark mass measurement of 170.1 ± 6.0(stat.) ± 4.1(syst.) GeV/c2.
Book Synopsis Measurement of the Top Quark Mass Using Template Methods on Dilepton Events in P Anti-p Collisions at S**ư by :
Download or read book Measurement of the Top Quark Mass Using Template Methods on Dilepton Events in P Anti-p Collisions at S**ư written by and published by . This book was released on 2006 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors describe a measurement of the top quark mass from events produced in p{bar p} collisions at a center-of-mass energy of 1.96 TeV, using the Collider Detector at Fermilab. They identify t{bar t} candidates where both W bosons from the top quarks decay into leptons (e?,??, or??) from a data sample of 360 pb−1. The top quark mass is reconstructed in each event separately by three different methods, which draw upon simulated distributions of the neutrino pseudorapidity, t{bar t} longitudinal momentum, or neutrino azimuthal angle in order to extract probability distributions for the top quark mass. For each method, representative mass distributions, or templates, are constructed from simulated samples of signal and background events, and parameterized to form continuous probability density functions. A likelihood fit incorporating these parameterized templates is then performed on the data sample masses in order to derive a final top quark mass. Combining the three template methods, taking into account correlations in their statistical and systematic uncertainties, results in a top quark mass measurement of 170.1 ± 6.0(stat.) ± 4.1(syst.) GeV/c2.
Book Synopsis Top Quark Mass Measurement from Dilepton Events at CDF II with the Matrix-element Method by :
Download or read book Top Quark Mass Measurement from Dilepton Events at CDF II with the Matrix-element Method written by and published by . This book was released on 2006 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Top Quark Mass with the Collider Detector at Fermilab by : Koji Sato
Download or read book Measurement of the Top Quark Mass with the Collider Detector at Fermilab written by Koji Sato and published by . This book was released on 2005 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of the top quark mass using tt pair creation events decaying into the lepton+jets channel in pp collisions at √s = 1.96 TeV. The data sample used in this analysis was collected with the Collider Detector at Fermilab (CDF) in Tevatron Run II during the period from March 2002 through August 2003.
Book Synopsis Journal of the Physical Society of Japan by :
Download or read book Journal of the Physical Society of Japan written by and published by . This book was released on 1993 with total page 1158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Top Quark Mass in the Dilepton Channel by :
Download or read book Measurement of the Top Quark Mass in the Dilepton Channel written by and published by . This book was released on 2006 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of the top quark mass in the dilepton channel based on approximately 370 pb−1 of data collected by the D0 experiment during Run II of the Fermilab Tevatron collider. We employ two different methods to extract the top quark mass. We show that both methods yield consistent results using ensemble tests of events generated with the D0 Monte Carlo simulation. We combine the results from the two methods to obtain a top quark mass m{sub t} = 178.1 ± 8.2 GeV. The statistical uncertainty is 6.7 GeV and the systematic uncertainty is 4.8 GeV.
Book Synopsis Measurement of the Top Quark Mass in the Dilepton Final State Using the Matrix Element Method by : Alexander Grohsjean
Download or read book Measurement of the Top Quark Mass in the Dilepton Final State Using the Matrix Element Method written by Alexander Grohsjean and published by . This book was released on 2010 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: The top quark, discovered in 1995 at the Fermilab Tevatron Collider, is the heaviest known elementary particle. The precise knowledge of its mass yields important constraints on the mass of the as-yet-undiscovered Higgs boson and allows one to probe for physics beyond the Standard Model. With an excellent adaptation of a novel measurement technique, described and applied here for the first time, the sensitivity to the top quark mass in the dilepton final state at the D0 experiment could be improved by more than 30%. Moreover, an extension to the method is presented which allows future measurements to significantly reduce the main limiting systematic uncertainty.
Book Synopsis A Measurement of the Top Quark Mass with a Matrix Element Method by : Adam Paul Gibson
Download or read book A Measurement of the Top Quark Mass with a Matrix Element Method written by Adam Paul Gibson and published by . This book was released on 2006 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Top Quark Mass Measurement from Dilepton Events at CDF II. by :
Download or read book Top Quark Mass Measurement from Dilepton Events at CDF II. written by and published by . This book was released on 2005 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Top Quark Mass with a Matrix Element Method in the Lepton Plus Jets Channel at CDF. by : Brian Mohr
Download or read book Measurement of the Top Quark Mass with a Matrix Element Method in the Lepton Plus Jets Channel at CDF. written by Brian Mohr and published by . This book was released on 2006 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a measurement of the mass of the top quark from p{bar p} collisions at 1.96 TeV observed with the Collider Detector at Fermilab (CDF) at the Fermilab Tevatron Run II. The events have the decay signature of p{bar p} {yields} t{bar t} in the lepton plus jets channel in which at least one jet is identified as coming from a secondary vertex and therefore a b-hadron. The largest systematic uncertainty, the jet energy scale (JES), is convoluted with the statistical error using an in-situ measurement of the hadronic W boson mass. They calculate a likelihood for each event using leading-order t{bar t} and W+jets cross-sections and parameterized parton showering. The final measured top quark mass and JES systematic is extracted from a joint likelihood of the product of individual event likelihoods. From 118 events observed in 680 pb{sup -1} of data, they measure a top quark mass of 174.09 {+-} 2.54 (stat+JES) {+-} 1.35(syst) GeV/c{sup 2}.
