A Measurement Of The Top Quark Mass In 1 96 Tev Proton Antiproton Collisions Using A Novel Matrix Element Method
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A Measurement Of The Top Quark Mass In 1 96 Tev Proton Antiproton Collisions Using A Novel Matrix Element Method
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Author : John Freeman
language : en
Publisher:
Release Date : 2007
A Measurement Of The Top Quark Mass In 1 96 Tev Proton Antiproton Collisions Using A Novel Matrix Element Method written by John Freeman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
A Measurement Of The Top Quark Mass In 1 96 Tev Proton Antiproton Collisions Using A Novel Matrix Element Method
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Author :
language : en
Publisher:
Release Date : 2007
A Measurement Of The Top Quark Mass In 1 96 Tev Proton Antiproton Collisions Using A Novel Matrix Element Method written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
A measurement of the top quark mass in t{bar t} --> l + jets candidate events, obtained from p{bar p} collisions at (square root)s = 1.96 TeV at the Fermilab Tevatron using the CDF II detector, is presented. The measurement approach is that of a matrix element method. For each candidate event, a two dimensional likelihood is calculated in the top pole mass and a constant scale factor, 'JES', where JES multiplies the input particle jet momenta and is designed to account for the systematic uncertainty of the jet momentum reconstruction. As with all matrix elements techniques, the method involves an integration using the Standard Model matrix element for tt production and decay. however, the technique presented is unique in that the matrix element is modified to compensate for kinematic assumptions which are made to reduce computation time. Background events are dealt with through use of an event observable which distinguishes signal from background, as well as through a cut on the value of an event's maximum likelihood. Results are based on a 955 pb−1 data sample, using events with a high-p{sub T} lepton and exactly four high-energy jets, at least one of which is tagged as coming from a b quark; 149 events pass all the selection requirements. They find M{sub meas} = 169.8 ± 2.3(stat.) ± 1.4(syst.) GeV/c2.
Chemical Abstracts
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Author :
language : en
Publisher:
Release Date : 2002
Chemical Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Chemistry categories.
Measurement Of The Top Quark Mass In The Dilepton Final State Using The Matrix Element Method
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Author : Alexander Grohsjean
language : en
Publisher: Springer Science & Business Media
Release Date : 2010-10-01
Measurement Of The Top Quark Mass In The Dilepton Final State Using The Matrix Element Method written by Alexander Grohsjean and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-10-01 with Science categories.
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.
Measurement Of The Top Quark Mass By Dynamical Likelihood Method Using The Lepton Plus Jets Events In 1 96 Tev Proton Antiproton Collisions
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Author : Kohei Yorita
language : en
Publisher:
Release Date : 2005
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 has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
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.
Measurement Of The Top Quark Mass By Dynamical Likelihood Method Using The Lepton Plus Jets Events In 1 96 Tev Proton Antiproton Collisions
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Author : 寄田浩平
language : en
Publisher:
Release Date : 2005
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 寄田浩平 and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Measurement Of The Top Quark Mass In The Lepton Jets Channel Using A Matrix Element Technique With The Cdf Ii Detector
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Author :
language : en
Publisher:
Release Date : 2011
Measurement Of The Top Quark Mass In The Lepton Jets Channel Using A Matrix Element Technique With The Cdf Ii Detector written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
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.
Measurement Of The Single Top Quark Production Cross Section In 1 96 Tev Proton Antiproton Collisions
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Author :
language : en
Publisher:
Release Date : 2009
Measurement Of The Single Top Quark Production Cross Section In 1 96 Tev Proton Antiproton Collisions written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Top quarks are predominantly produced in pairs via the strong interaction in {bar p}p collisions at √s = 1.96 TeV . The top quark has a weak isospin 1/2, composing a weak isospin doublet with the bottom quark. This characteristic predicts not only top quark pair production via strong interaction but also single production together with a bottom quark via weak interaction. However, finding single top quark production is challenging since it is rarely produced ([sigma]{sub singletop} = 2.9 pb) against background processes with the same final state like W+jets and t{bar t}. A measurement of electroweak single top production probes the W-t-b vertex, which provides a direct determination of the Cabbibo-Kobayashi-Maskawa (CKM) matrix element.
A Top Quark Mass Measurement Using A Matrix Element Method
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Author :
language : en
Publisher:
Release Date : 2010
A Top Quark Mass Measurement Using A Matrix Element Method written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
A measurement of the mass of the top quark is presented, using top-antitop pair (t{bar t}) candidate events for the lepton+jets decay channel. The measurement makes use of Tevatron p{bar p} collision data at centre-of-mass energy √s = 1.96 TeV, collected at the CDF detector. The top quark mass is measured by employing an unbinned maximum likelihood method where the event probability density functions are calculated using signal (t{bar t}) and background (W+jets) matrix elements, as well as a set of parameterised jet-to-parton mapping functions. The likelihood function is maximised with respect to the top quark mass, the fraction of signal events, and a correction to the jet energy scale (JES) of the calorimeter jets. The simultaneous measurement of the JES correction ([Delta]{sub JES}) provides an in situ jet energy calibration based on the known mass of the hadronically decaying W boson. Using 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, one of the most precise single measurements to date.
A Precision Measurement Of The Top Quark Mass
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Author : Kevin Matthew Black
language : en
Publisher:
Release Date : 2005
A Precision Measurement Of The Top Quark Mass written by Kevin Matthew Black and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
This dissertation describes the measurement of the top quark mass using events recorded during a {approx} 230 pb{sup -1} exposure of the D0 detector to proton-anti-proton (p{bar p}) collisions at a center of mass energy of 1.96 TeV. The Standard Model of particle physics predicts that the top quark will decay into a bottom quark and a W boson close to 100% of the time. The bottom quark will hadronize (bind with another quark) and produce a jet of hadronic particles. The W bosons can decay either into a charged lepton and a neutrino or a pair of quarks. this dissertation focuses on the top quark (t{bar t}) events in which one W decays hadronically and the other decays leptonically. Two methods of identifying t{bar t} events from the large number of events produced are used. The first is based on the unique topology of the final state particles of a heavy particle. By using the topological information of the event, the t{bar t} events can be efficiently extracted from the background. The second method relies on the identification of the remnants of the long lived bottom quarks that are expected to be produced in the decay of almost every top quark. Because the largest background processes do not contain bottom quarks, this is an extremely efficient way to select the events retaining about 60% of the t{bar t} events and removing almost 90% of the background. A kinematic fit to the top quark mass is performed on the t{bar t} candidate events using the final state particles that are seen in the detector. A likelihood technique is then used to extract the most likely value of the top quark mass, m{sub t}, and signal fraction. The result for the topological selection is m{sub t} = 169.9 {+-} 5.8(statistical){sub -7.8}{sup +8.0}(systematic) GeV while the results on the sample selected from identification of a b quark in the event is m{sub t} = 170.6 {+-} 4.2(statistical){sub -6.8}{sup +6.3}(systematic) GeV.