A Measurement Of The Mass Of The Top Quark In Lepton Jets Events At Cdf
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Author | : Erik Matthews Brubaker |
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Total Pages | : 236 |
Release | : 2004 |
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Download A Measurement of the Mass of the Top Quark in Lepton + Jets Events at CDF Book in PDF, Epub and Kindle
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Release | : 2005 |
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Download A Measurement of the Mass of the Top Quark in Lepton + Jets Events at CDF. Book in PDF, Epub and Kindle
This document presents a measurement of the top quark mass using the CDF run II detector at Fermilab. Colliding beams of protons and anti-protons at Fermilab's Tevatron ([radical]s = 1.96 TeV) produce top/anti-top pairs, which decay to W[sup +]W[sup -] b[bar b]; events are selected where one W decays hadronically, and one W decays to either e or [mu] plus a neutrino. The data sample was collected between March 2002 and September 2003, and corresponds to an integrated luminosity of approximately 162 pb[sup -1]. Thirty-seven candidate t[bar t] events are found with at least one b jet identified by its displaced vertex. In each event, the best fit top quark invariant mass is determined by minimizing a [chi][sup 2] for the overconstrained kinematic system. A likelihood fit of the reconstructed masses in the data sample to distributions from simulated signal and background events gives a top mass of 174.9[sub -7.7][sup +7.1](stat.) [+-] 6.5(syst.) GeV/c[sup 2]. The dominant systematic error is due to uncertainties in the jet energy measurements.
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Total Pages | : 6 |
Release | : 2005 |
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Download Izmerenie Massy Top-kvarka V Nemečenych Sobytijach Tipa "lepton + Strui" Na CDF Book in PDF, Epub and Kindle
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Total Pages | : 24 |
Release | : 2008 |
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Download The First Measurement of the Top Quark Mass at CDF II in the Lepton+jets and Dilepton Channels Simultaneously Book in PDF, Epub and Kindle
The authors present a measurement of the mass of the top quark using data corresponding to an integrated luminosity of 1.9 fb−1 of p{bar p} collisions collected at (square root)s = 1.96 TeV with the CDF II detector at Fermilab's Tevatron. This is the first measurement of the top quark mass using top-antitop pair candidate events in the lepton + jets and dilepton decay channels simultaneously. They reconstruct two observables in each channel and use a non-parametric kernel density estimation technique to derive two-dimensional probability density functions from simulated signal and background samples. The observables are the top quark mass and the invariant mass of two jets from the W decay in the lepton + jets channel, and the top quark mass and the scalar sum of transverse energy of the event in the diletpon channel. They perform a simultaneous fit for the top quark mass and the jet energy scale, which is constrained in situ by the hadronic W boson mass. using 332 lepton + jets candidate events and 144 diletpon candidate events, they measure the top quark mass to be m{sub top} = 171.9 ± 1.7 (stat. + JES) ± 1.1 (other sys.) GeV/c2 = 171.9 ± 2.0 GeV/c2.
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Total Pages | : 7 |
Release | : 2007 |
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Download Precise Measurement of the Top Quark Mass in the Lepton+jets Topology at CDF II. Book in PDF, Epub and Kindle
The authors present a measurement of the mass of the top quark from proton-antiproton collisions recorded at the CDF experiment in Run II of the Fermilab Tevatron. They analyze events from the single lepton plus jets final state (t{bar t} --> WbW−{bar b} --> lvbq{bar q}{bar b}). The top quark mass is extracted using a direct calculation of the probability density that each event corresponds to the t{bar t} final state. The probability is a function of both the mass of the top quark and the energy scale of the calorimeter jets, which is constrained in situ by the hadronic W boson mass. Using 167 events observed in 955 pb−1 of integrated luminosity, they achieve the single most precise measurement of the top quark mass, 170.8 ± 2.2(stat.) ± 1.4(syst.) GeV/c2.
Author | : Brian Mohr |
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Total Pages | : 5 |
Release | : 2006 |
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Download Measurement of the Top Quark Mass with a Matrix Element Method in the Lepton Plus Jets Channel at CDF. Book in PDF, Epub and Kindle
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}.
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Total Pages | : 9 |
Release | : 2011 |
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Download Measurement of the Top-quark Mass in the Lepton+jets Channel Using a Matrix Element Technique with the CDF II Detector Book in PDF, Epub and Kindle
A measurement of the top-quark mass is presented using Tevatron data from proton-antiproton collisions at center-of-mass energy √ = 1.96 TeV collected with the CDF II detector. Events are selected from a sample of candidates for production of t{bar t} pairs that decay into the lepton+jets channel. The top-quark mass is measured with an unbinned maximum likelihood method where the event probability density functions are calculated using signal and background matrix elements, as well as a set of parameterized jet-to-parton transfer functions. The likelihood function is maximized with respect to the top-quark mass, the signal fraction in the sample, and a correction to the jet energy scale (JES) calibration of the calorimeter jets. The simultaneous measurement of the JES correction ([Delta]{sub JES}) amounts to an additional in situ jet energy calibration based on the known mass of the hadronically decaying W boson. Using the data sample of 578 lepton+jets candidate events, corresponding to 3.2 fb−1 of integrated luminosity, the top-quark mass is measured to be m{sub t} = 172.4 ± 1.4 (stat + [Delta]{sub JES}) ± 1.3 (syst) GeV/c2.
Author | : Jahred Adelman |
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Total Pages | : 320 |
Release | : 2008 |
Genre | : Particles (Nuclear physics) |
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Download Measurement of the Top Quark Mass at CDF Using the Template Method in the Lepton+Jets Channel Book in PDF, Epub and Kindle
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Total Pages | : 8 |
Release | : 2010 |
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Download A Direct Top-Quark Width Measurement from Lepton + Jets Events at CDF II. Book in PDF, Epub and Kindle
We present a measurement of the top-quark width using t{bar t} events produced in p{bar p} collisions at Fermilab's Tevatron collider and collected by the CDF II detector. In the mode where the top quark decays to a W boson and a bottom quark, we select events in which one W decays leptonically and the other hadronically (lepton + jets channel) . From a data sample corresponding to 4.3 fb−1 of integrated luminosity, we identify 756 candidate events. The top-quark mass and the mass of W boson that decays hadronically are reconstructed for each event and compared with templates of different top-quark widths ([Lambda]{sub t}) and deviations from nominal jet energy scale ([Delta]{sub JES}) to perform a simultaneous fit for both parameters, where [Delta]{sub JES} is used for the in situ calibration of the jet energy scale. By applying a Feldman-Cousins approach, we establish an upper limit at 95% confidence level (CL) of [Lambda]{sub t}
Author | : Nathan Robert-Claire Eddy |
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Total Pages | : 262 |
Release | : 1999 |
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Download Measurement of the Top Quark Mass from B-tagged Events in the Lepton Plus Jets Channel in Pp̄ Collisions at [square Root of S] Book in PDF, Epub and Kindle