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Author: Paola Giovannini
Publisher:
ISBN:
Category :
Languages : en
Pages : 149
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Author: Paola Giovannini
Publisher:
ISBN:
Category :
Languages : en
Pages : 149
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Author: Thomas McCarthy
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Category :
Languages : en
Pages :
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Author: Stefanie Adomeit
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Category :
Languages : en
Pages : 0
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Author:
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Category :
Languages : en
Pages :
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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.
Author: Roland Härtel
Publisher:
ISBN:
Category :
Languages : en
Pages : 123
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Author:
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Category :
Languages : en
Pages :
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This thesis outlines the prospects for top quark mass measurement through the Fully Hadronic decay of top-antitop events with the ATLAS detector. Methods with and without b-tagging were explored. Without b-tagging the signal was hidden beneath the QCD multi-jet background and prospects for a mass measurement do not appear to be good. A standard and a pessimistic b-tagging likelihood significance value were explored. The standard value gives a S/B of 0.88 and the more pessimistic value gives a S/B of 0.79. For 1 fb−1 a significance of 36.8 and 32.0 can be obtained for the standard and pessimistic scenarios respectively. A selection efficiency of 1.4% and 1.1% can be achieved for the standard and pessimistic values respectively. Assuming a top mass of 174 GeV, a mass peak can clearly be seen for both b-tagging values. For the standard scenario, a top mass of 168.94 GeV with a statistical error of 0.33 GeV can be extracted. With the pessimistic scenario, the extracted mass is 169.11 GeV with a statistical error of 0.36 GeV. This is the first attempt with fully simulated events and therefore there are possibilities for improvement. This analysis did not include b-jet energy scale correction.
Author: Keith Edmonds
Publisher:
ISBN:
Category :
Languages : en
Pages :
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This thesis outlines the prospects for top quark mass measurement through theFully Hadronic decay of top-antitop events with the ATLAS detector. Methods withand without b-tagging were explored. Without b-tagging the signal was hidden beneaththe QCD multi-jet background and prospects for a mass measurement do notappear to be good. A standard and a pessimistic b-tagging likelihood significancevalue were explored. The standard value gives a S/B of 0.88 and the more pessimisticvalue gives a S/B of 0.79. For 1 fb?1 a significance of 36.8 and 32.0 can be obtainedfor the standard and pessimistic scenarios respectively. A selection efficiency of 1.4%and 1.1% can be achieved for the standard and pessimistic values respectively. Assuminga top mass of 174 GeV, a mass peak can clearly be seen for both b-taggingvalues. For the standard scenario, a top mass of 168.94 GeV with a statistical errorof 0.33 GeV can be extracted. With the pessimistic scenario, the extracted mass is169.11 GeV with a statistical error of 0.36 GeV. This is the first attempt with fullysimulated events and therefore there are possibilities for improvement. This analysisdid not include b-jet energy scale correction.
Author: Gheorghe Lungu
Publisher:
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Category :
Languages : en
Pages :
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ABSTRACT: 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 [line over 2nd p] collisions at the square root of 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 [line over 2nd t] 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, [sigma] sub c. The measured mass of the top quark is 171.1"3.7(stat.unc.)"2.1(syst.unc.) GeV/c2 and to the date represents the most precise mass measurement in the all hadronic channel and third best overall.
Author: Shota Tsiskaridze
Publisher: Springer
ISBN: 3319634143
Category : Science
Languages : en
Pages : 248
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This PhD thesis focuses on the search for flavor-changing neutral currents in the decay of a top quark to an up-type quark (q = u, c) and the Standard Model Higgs boson, where the Higgs boson decays to bb. Further, the thesis presents the combination of this search for top quark pair events with other ATLAS searches – in the course of which the most restrictive bounds to date on tqH interactions were obtained. Following on from the discovery of the Higgs boson, it is particularly important to measure the Yukawa couplings of the Standard Model fermions; these parameters may provide crucial insights to help solve the flavor puzzle and may help reveal the presence of new physics before it is directly observed in experiments.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 277
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A measurement of the top quark mass in proton-antiproton collisions at √s = 1.96 TeV using 1040fb−1 of data collected in D detector at Fermilab is presented. This analysis focuses on the all-hadronic decay mode of the top quark and therefore only events with six or more calorimeter jets in the final state are considered.
