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Title: Measurement of the top quark mass using the template method in the lepton plus jets channel with in situ W ---> j j calibration at CDF-II

Abstract

We report an updated measurement of the top quark mass in the lepton plus jets channel of t{bar t} events from p{bar p} collisions at {radical}s = 1.96 TeV. This measurement uses a dataset with integrated luminosity of 680 pb{sup -1}, containing 360 t{bar t} candidates separated into four subsamples. A top quark mass is reconstructed for each event by using energy and momentum constraints on the top quark pair decay products. We also employ the reconstructed mass of hadronic W boson decays W {yields} jj to constrain in situ the largest systematic uncertainty of the top quark mass measurement: the jet energy scale. Monte Carlo templates of the reconstructed top quark and W boson mass are produced as a function of the true top quark mass and the jet energy scale. The distribution of reconstructed top quark and W boson mass in the data are compared to the Monte Carlo templates using a likelihood fit to obtain: M{sub top} = 173.4 {+-} 2.8 GeV/c{sup 2}.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
899066
Report Number(s):
FERMILAB-FN-0794-E
TRN: US200711%%526
DOE Contract Number:
AC02-07CH11359
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CALIBRATION; DAUGHTER PRODUCTS; DISTRIBUTION; INTERMEDIATE BOSONS; LEPTONS; LUMINOSITY; T QUARKS; Experiment-HEP

Citation Formats

Adelman, Jahred A., Arguin, J.F., Bellettini, G., Brubaker, E., Budagov, J., Chlachidze, G., Demortier, L., Gibson, A., Kim, S., Kim, Y.K., Maruyama, T., Sato, K., Shochet, M., Sinervo, P., Tomura, T., Velev, G., Xie, S., Yang, U.K., and /Chicago U. /Toronto U. /INFN, Pisa /Dubna, JINR /Rockefeller U. /LBL, Berkeley /Tsukuba U. /Fermilab. Measurement of the top quark mass using the template method in the lepton plus jets channel with in situ W ---> j j calibration at CDF-II. United States: N. p., 2006. Web. doi:10.2172/899066.
Adelman, Jahred A., Arguin, J.F., Bellettini, G., Brubaker, E., Budagov, J., Chlachidze, G., Demortier, L., Gibson, A., Kim, S., Kim, Y.K., Maruyama, T., Sato, K., Shochet, M., Sinervo, P., Tomura, T., Velev, G., Xie, S., Yang, U.K., & /Chicago U. /Toronto U. /INFN, Pisa /Dubna, JINR /Rockefeller U. /LBL, Berkeley /Tsukuba U. /Fermilab. Measurement of the top quark mass using the template method in the lepton plus jets channel with in situ W ---> j j calibration at CDF-II. United States. doi:10.2172/899066.
Adelman, Jahred A., Arguin, J.F., Bellettini, G., Brubaker, E., Budagov, J., Chlachidze, G., Demortier, L., Gibson, A., Kim, S., Kim, Y.K., Maruyama, T., Sato, K., Shochet, M., Sinervo, P., Tomura, T., Velev, G., Xie, S., Yang, U.K., and /Chicago U. /Toronto U. /INFN, Pisa /Dubna, JINR /Rockefeller U. /LBL, Berkeley /Tsukuba U. /Fermilab. Mon . "Measurement of the top quark mass using the template method in the lepton plus jets channel with in situ W ---> j j calibration at CDF-II". United States. doi:10.2172/899066. https://www.osti.gov/servlets/purl/899066.
@article{osti_899066,
title = {Measurement of the top quark mass using the template method in the lepton plus jets channel with in situ W ---> j j calibration at CDF-II},
author = {Adelman, Jahred A. and Arguin, J.F. and Bellettini, G. and Brubaker, E. and Budagov, J. and Chlachidze, G. and Demortier, L. and Gibson, A. and Kim, S. and Kim, Y.K. and Maruyama, T. and Sato, K. and Shochet, M. and Sinervo, P. and Tomura, T. and Velev, G. and Xie, S. and Yang, U.K. and /Chicago U. /Toronto U. /INFN, Pisa /Dubna, JINR /Rockefeller U. /LBL, Berkeley /Tsukuba U. /Fermilab},
abstractNote = {We report an updated measurement of the top quark mass in the lepton plus jets channel of t{bar t} events from p{bar p} collisions at {radical}s = 1.96 TeV. This measurement uses a dataset with integrated luminosity of 680 pb{sup -1}, containing 360 t{bar t} candidates separated into four subsamples. A top quark mass is reconstructed for each event by using energy and momentum constraints on the top quark pair decay products. We also employ the reconstructed mass of hadronic W boson decays W {yields} jj to constrain in situ the largest systematic uncertainty of the top quark mass measurement: the jet energy scale. Monte Carlo templates of the reconstructed top quark and W boson mass are produced as a function of the true top quark mass and the jet energy scale. The distribution of reconstructed top quark and W boson mass in the data are compared to the Monte Carlo templates using a likelihood fit to obtain: M{sub top} = 173.4 {+-} 2.8 GeV/c{sup 2}.},
doi = {10.2172/899066},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon May 01 00:00:00 EDT 2006},
month = {Mon May 01 00:00:00 EDT 2006}
}

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  • No abstract prepared.
  • This article presents a measurement of the top quark mass using the CDF II detector at Fermilab. Colliding beams of protons and antiprotons at Fermilab's Tevatron ({radical}(s)=1.96 TeV) produce top/antitop pairs, which decay to W{sup +}W{sup -}bb; events are selected where one W decays to hadrons and the other W decays to either e or {mu} plus a neutrino. The data sample corresponds to an integrated luminosity of approximately 318 pb{sup -1}. A total of 165 tt events are separated into four subsamples based on jet transverse energy thresholds and the number of b jets identified by reconstructing a displacedmore » vertex. In each event, the reconstructed top quark invariant mass is determined by minimizing a {chi}{sup 2} for the overconstrained kinematic system. At the same time, the mass of the hadronically decaying W boson is measured in the same event sample. The observed W boson mass provides an in situ improvement in the determination of the hadronic jet energy scale. A simultaneous likelihood fit of the reconstructed top quark masses and the W boson invariant masses in the data sample to distributions from simulated signal and background events gives a top quark mass of 173.5{sub -3.8}{sup +3.9} GeV/c{sup 2}.« less
  • The top quark mass has been measured using the template method in the t{bar t} {yields} lepton + jets channel based on data recorded in 2011 with the ATLAS detector at the LHC. The data were taken at a proton-proton center-of-mass energy of {radical}s = 7 TeV and correspond to an integrated luminosity of 1.04 fb{sup -1}. The analyses in the e + jets and {mu} + jets decay channels yield consistent results. The top quark mass is measured to be m{sub top} = 174.5 {+-} 0.6{sub stat} {+-} 2.3{sub syst} GeV.
  • A measurement of the top quark mass in pmore » $$\bar{p}$$ collisions at √s = 1.96 TeV is presented. The analysis uses a template method, in which the overconstrained kinematics of the Lepton+Jets channel of the t$$\bar{t}$$ system are used to measure a single quantity, the reconstructed top quark mass, that is strongly correlated with the true top quark mass. in addition, the dijet mass of the hadronically decaying W boson is used to constrain in situ the uncertain jet energy scale in the CDF detector. Two-dimensional probability density functions are derived using a kernel density estimate-based machinery. Using 1.9 fb -1 of data, the top quark mass is measured to be 171.8$$+1.9\atop{-1.9}$$(stat.) ± 1.0(syst.)GeV/c 2.« less