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Title: Measurement of the Top Quark Mass in Dilepton Channel

Abstract

Method for the determination of the mass of the top quark in dilepton channel based of full reconstruction of the tt-bar system and weighting of obtained solutions is presented. This method was applied and recently published for ATLAS detector. Monte Carlo simulations of the D0 detector response has been done to show that the method is applicable for the D0 detector, and to estimate statistical errors of the method.

Authors:
;  [1];  [2];  [3]
  1. Faculty of Nuclear Sciences and Physical engineering, Czech Technical University in Prague (Czech Republic)
  2. Institute of Physics, Academy of Science of Czech Republic, Prague (Czech Republic)
  3. (Czech Republic)
Publication Date:
OSTI Identifier:
20798050
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 815; Journal Issue: 1; Conference: 25. international conference on physics in collision, Prague (Czech Republic), 5-9 Jul 2005; Other Information: DOI: 10.1063/1.2173598; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COMPUTERIZED SIMULATION; LEPTONS; MONTE CARLO METHOD; MULTIPARTICLE SPECTROMETERS; PARTICLE IDENTIFICATION; REST MASS; T QUARKS

Citation Formats

Homola, Petr, Gazda, Daniel, Simak, Vladislav, and Faculty of Nuclear Sciences and Physical engineering, Czech Technical University in Prague. Measurement of the Top Quark Mass in Dilepton Channel. United States: N. p., 2006. Web. doi:10.1063/1.2173598.
Homola, Petr, Gazda, Daniel, Simak, Vladislav, & Faculty of Nuclear Sciences and Physical engineering, Czech Technical University in Prague. Measurement of the Top Quark Mass in Dilepton Channel. United States. doi:10.1063/1.2173598.
Homola, Petr, Gazda, Daniel, Simak, Vladislav, and Faculty of Nuclear Sciences and Physical engineering, Czech Technical University in Prague. Wed . "Measurement of the Top Quark Mass in Dilepton Channel". United States. doi:10.1063/1.2173598.
@article{osti_20798050,
title = {Measurement of the Top Quark Mass in Dilepton Channel},
author = {Homola, Petr and Gazda, Daniel and Simak, Vladislav and Faculty of Nuclear Sciences and Physical engineering, Czech Technical University in Prague},
abstractNote = {Method for the determination of the mass of the top quark in dilepton channel based of full reconstruction of the tt-bar system and weighting of obtained solutions is presented. This method was applied and recently published for ATLAS detector. Monte Carlo simulations of the D0 detector response has been done to show that the method is applicable for the D0 detector, and to estimate statistical errors of the method.},
doi = {10.1063/1.2173598},
journal = {AIP Conference Proceedings},
number = 1,
volume = 815,
place = {United States},
year = {Wed Feb 08 00:00:00 EST 2006},
month = {Wed Feb 08 00:00:00 EST 2006}
}
  • We report a measurement of the top quark mass using six candidate events for the process p{bar p}{r_arrow}t{bar t}+X{r_arrow}l{sup +}{nu}bl{sup {minus}}{bar {nu}}{bar b}+X, observed in the D0 experiment at the Fermilab p{bar p} collider. Using maximum likelihood fits to the dynamics of the decays, we measure a mass for the top quark of m{sub t}=168.4{plus_minus}12.3(stat){plus_minus}3.6(syst) Gev. We combine this result with our previous measurement in the t{bar t}{r_arrow}l+jets channel to obtain m{sub t}=172.1{plus_minus}7.1 GeV as the best value of the mass of the top quark measured by D0. {copyright} {ital 1999} {ital The American Physical Society}
  • No abstract prepared.
  • We present a measurement of the top quark mass in the dilepton channel based on approximately 370 pb{sup -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.
  • We report a measurement of the top quark mass, m{sub t}, obtained from p{bar p} collisions at {radical}s = 1.96 TeV at the Fermilab Tevatron using the CDF II detector. We analyze a sample corresponding to an integrated luminosity of 1.9 fb{sup -1}. We select events with an electron or muon, large missing transverse energy, and exactly four high-energy jets in the central region of the detector, at least one of which is tagged as coming from a b quark. We calculate a signal likelihood using a matrix element integration method, where the matrix element is modified by using effectivemore » propagators to take into account assumptions on event kinematics. Our event likelihood is a function of m{sub t} and a parameter JES (jet energy scale) that determines in situ the calibration of the jet energies. We use a neural network discriminant to distinguish signal from background events. We also apply a cut on the peak value of each event likelihood curve to reduce the contribution of background and badly reconstructed events. Using the 318 events that pass all selection criteria, we find m{sub t} = 172.7 {+-} 1.8(stat + JES) {+-} 1.2(syst) GeV/c{sup 2}.« less
  • We measure the top quark mass (m{sub t}) in p{bar p} collisions at a center of mass energy {radical}s = 1.96 TeV using dilepton t{bar t} {yields} W{sup +}bW{sup -}{bar b} {yields} {ell}{sup +} {nu}{sub {ell}}b{ell}{sup -} {bar {nu}}{sub {ell}}{bar b} events, where {ell} denotes an electron, a muon, or a tau that decays leptonically. The data correspond to an integrated luminosity of 5.4 fb{sup -1} collected with the D0 detector at the Fermilab Tevatron Collider. We obtain m{sub t} = 174.0 {+-} 1.8(stat) {+-} 2.4(syst) GeV, which is in agreement with the current world average m{sub t} = 173.3more » {+-} 1.1 GeV. This is currently the most precise measurement of m{sub t} in the dilepton channel.« less