Download or read book Top Mass Measurements at the Tevatron written by and published by . This book was released on 2012 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: First observed in 1995, the top quark is the third-generation up-type quark of the standard model of particle physics (SM). The CDF and D0 collaborations have analyzed many t{bar t} events produced by the Tevatron collider, studying many properties of the top quark. Among these, the mass of the top quark is a fundamental parameter of the SM, since its value constrains the mass of the yet to be observed Higgs boson. The analyzed events were used to measure the mass of the top quark m{sub t} ≃ 173.2 GeV/c2 with an uncertainty of less than 1 GeV/c2. We report on the latest top mass measurements at the Tevatron, using up to 6 fb−1 of data for each experiment.

Download or read book Selected Topics from Top Mass Measurements at the Tevatron written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The most recent results of the top-quark mass measurements at the Tevatron at Fermilab are presented. Data were collected in proton-antiproton collisions at sqrt{s}=1.96 TeV by the CDF and D0 experiments. Top quark mass measurements in the lepton+jets, dilepton and alljet final states as well as their combination and the extraction of the mass from the cross-section measurement are presented.

Download or read book Top Quark Mass Measurements at the Tevatron written by and published by . This book was released on 2008 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Top quark mass measurements from the Tevatron using up to 2.0 fb−1 of data are presented. Prospects for combined Tevatron measurements by the end of Run II are discussed.

Download or read book Top Quark Mass Measurement at the Tevatron written by Joao Guimaraes da Costa and published by . This book was released on 2004 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors report on the latest experimental measurements of the top quark mass by the CDF and D0 Collaborations at the Fermilab Tevatron. They present a new top mass measurement using the t{bar t} events collected by the D0 Collaboration in Run I between 1994 and 1996. This result is combined with previous measurements to yield a new world top mass average. They also describe several preliminary results using up to 193 pb{sup -1} of t{bar t} events produced in {bar p}p collisions at {radical}s = 1.96 TeV during the Run II of the Tevatron.

Download or read book Top Mass Measurements at the Tevatron Run II written by Gueorgui V. Velev and published by . This book was released on 2005 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: The latest top quark mass measurements by the CDF and D0 experiments are presented here. The mass has been determined in the dilepton (t{bar t} {yields} e{mu}, ee, {mu}{mu} + jets + E{sub T}) and lepton plus jets (t{bar t} {yields} e or {mu} + jets + E{sub T}) final states. The most accurate single result from lepton plus jets channel is 173.5{sub -3.6}{sup +3.7}(stat. + Jet Energy Scale Systematic) {+-} 1.3(syst.) GeV/c{sup 2}, which is better than the combined CDF and D0 Run I average. A preliminary and unofficial average of the best experimental Run II results gives M{sub top} = 172.7 {+-} 3.5 GeV/c{sup 2}.

Download or read book Top Quark Mass Measurements at the Tevatron and the Standard Model Fits written by and published by . This book was released on 2007 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: New measurements of the top quark mass from the Tevatron are presented. Combined with previous results, they yield a preliminary new world average of m{sub top} = 170.9 ± 1.1(stat) ± 1.5(syst)GeV/c2 and impose new constraints on the mass of the Higgs boson.

Download or read book To Quark Mass Measurements at the Tevatron 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 two new measurements of the top-quark mass. Using the same methodology applied in Run I, the CDF experiment uses 72 pb−1 of Run II data to measure M{sub top} = 171.2 " 13.4{sub stat} " 99{sub syst} GeV/c2. On the other hand, the D0 experiment, using 125 pb−1 from Run I, and applying a new method that extracts information from data through a direct calculation of a probability for each event, obtains M{sub top} = 180.1 " 3.6{sub stat} " 4.0{sub syst} GeV/c2.

Download or read book Top Quark Mass Measurements from the Tevatron written by and published by . This book was released on 1997 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: We review the measurements of the top quark mass by the CDF and D0 collaborations using Run I data in excess of 1.00 pb−1. The D0 collaboration has recently updated its measurement of the top quark mass in the lepton + jets channel. The world average of the top quark mass from the CDF and D0 measurements in the lepton + jets channel now stands at 175.6 " 5.5 GeV/c2.

Download or read book Measurements of the Top Quark Mass at the Tevatron written by and published by . This book was released on 2012 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mass of the top quark (m{sub top}) is a fundamental parameter of the standard model (SM). Currently, its most precise measurements are performed by the CDF and D0 collaborations at the Fermilab Tevatron p{bar p} collider at a centre-of-mass energy of √s = 1.96 TeV. We review the most recent of those measurements, performed on data samples of up to 8.7 fb−1 of integrated luminosity. The Tevatron combination using up to 5.8 fb−1 of data results in a preliminary world average top quark mass of m{sub top} = 173.2 ± 0.9 GeV. This corresponds to a relative precision of about 0.54%. We conclude with an outlook of anticipated precision the final measurement of m{sub top} at the Tevatron.

Download or read book De Heylige Evangelien written by and published by . This book was released on 1692 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Standard Model Higgs and Top Mass Measurements at the Tevatron written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A summary of the present Standard Model Higgs search and measurement of top quark mass at the Tevatron are presented. The sensitivity of the present Higgs search at the Tevatron is limited by statistics to a cross section approximately two orders of magnitude higher than the predicted cross section for standard model Higgs production. With 30 fb[sup -1] of integrated luminosity, the Tevatron offers an unique potential discovery window for the Standard Model Higgs mass up to 130 GeV/c[sup 2] before LHC era. The study of top at the Tevatron has moved from discovery phase to one of characterizing its properties. The combined result of top quark mass is 174.3 [+-] 5.1 GeV/c[sup 2] ([delta]m[sub t] =m[sub t]

Download or read book First Combination of Tevatron and LHC Measurements of the Top quark Mass written by and published by . This book was released on 2014 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Springer Science & Business Media. This book was released on 2010-10-01 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main pacemakers of scienti?c research are curiosity, ingenuity, and a pinch of persistence. Equipped with these characteristics a young researcher will be s- cessful in pushing scienti?c discoveries. And there is still a lot to discover and to understand. In the course of understanding the origin and structure of matter it is now known that all matter is made up of six types of quarks. Each of these carry a different mass. But neither are the particular mass values understood nor is it known why elementary particles carry mass at all. One could perhaps accept some small generic mass value for every quark, but nature has decided differently. Two quarks are extremely light, three more have a somewhat typical mass value, but one quark is extremely massive. It is the top quark, the heaviest quark and even the heaviest elementary particle that we know, carrying a mass as large as the mass of three iron nuclei. Even though there exists no explanation of why different particle types carry certain masses, the internal consistency of the currently best theory—the standard model of particle physics—yields a relation between the masses of the top quark, the so-called W boson, and the yet unobserved Higgs particle. Therefore, when one assumes validity of the model, it is even possible to take precise measurements of the top quark mass to predict the mass of the Higgs (and potentially other yet unobserved) particles.

Download or read book Measurement of the W and Top Mass at the Tevatron written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The measurements of the mass of the W boson (M{sub W}) and of the top quark (M{sub t}) are important for three reasons: (i) these masses represent fundamental parameters of the Standard Model; (ii) they determine the coupling between the top quark and the Higgs boson, the coupling being proportional to M{sub t}2/M{sub W}2; and (iii) radiative corrections relate the masses of the W, top quark and the Higgs boson: an accurate measurement of M{sub W} and M{sub t} would provide a constraint on the Higgs mass (M{sub H}). We present here the measurements obtained by the CDF and D0 collaborations corresponding to the so-called Run I of data-taking (1992-95, (almost equal to) 100 pb−1 each) at the Tevatron (p{bar p} collisions, (square root)s = 1.8 TeV). In addition we report on the improvements expected for these measurements in the current run (so-called Run IIa) which, having just started (March 2001), is expected to collect about 2 fb−1 by the year 2004.

Download or read book Top and Electroweak Measurements at the Tevatron written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this report, we summarize the latest results of the top-quark mass and electroweak measurements from the Tevatron. Since the world combination of top-quark mass measurements was done, CDF and D0 experiments improved the precision of several results. Some of them reach the relative precition below 1% for a single measurement. From the electroweak results, we report on the WW and WZ production cross section, measurements of the weak mixing angle and indirect measurements of W boson mass. The Tevatron results of the weak mixing angle are still the most precise ones of hadron colliders.

Download or read book Top Quark Mass Measurements written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Preliminary results on the measurement of the top quark mass at the Tevatron Collider are presented. In the dilepton decay channel, the CDF Collaboration measures m{sub t} = 175.0{sub -16.9}{sup +17.4}(stat.)"8.4(syst.) GeV/c2, using a sample of (almost equal to) 126 pb−1 of proton-antiproton collision data at (square root)s = 1.96 TeV (Run II). In the lepton plus jets channel, the CDF Collaboration measures 177.5{sub -9.4}{sup +12.7}(stat.) " 7.1(syst.) GeV/c2, using a sample of (almost equal to) 102 pb−1 at (square root)s = 1.96 TeV. The D0 Collaboration has newly applied a likelihood technique to improve the analysis of (almost equal to) 125 pb−1 of proton-antiproton collisions at (square root)s = 1.8 TeV (Run I), with the result: m{sub t} = 180.1 " 3.6(stat.) "3.9(syst.) GeV/c2. The latter is combined with all the measurements based on the data collected in Run I to yield the most recent and comprehensive experimental determination of the top quark mass: m{sub t} = 178.0 " 2.7(stat.) " 3.3(syst.) GeV/c2.

Download or read book Measurement of the Top Quark Mass in the All Hadronic Channel at the Tevatron written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This study presents a measurement of the top quark mass in the all hadronic channel of the top quark pair production mechanism, using 1 fb-1 of pp collisions at s =1.96 TeV collected at the Collider Detector at Fermilab (CDF). Few novel techniques have been used in this measurement. A template technique was used to simultaneously determine the mass of the top quark and the energy scale of the jets. Two sets of distributions have been parameterized as a function of the top quark mass and jet energy scale. One set of distributions is built from the event-by-event reconstructed top masses, determined using the Standard Model matrix element for the tt all hadronic process. This set is sensitive to changes in the value of the top quark mass. The other set of distributions is sensitive to changes in the scale of jet energies and is built from the invariant mass of pairs of light flavor jets, providing an in situ calibration of the jet energy scale. The energy scale of the measured jets in the final state is expressed in units of its uncertainty, sigmac. The measured mass of the top quark is 171.1+/-3.7(stat.unc.)+/-2.1(syst.unc.) GeV/c 2 and to the date represents the most precise mass measurement in the all hadronic channel and third best overall.