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Title: Precision Measurement of the Top Quark Mass at CDF

Authors:
 [1]
  1. Siena U.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1415837
Report Number(s):
FERMILAB-THESIS-2007-10
754037
DOE Contract Number:
AC02-07CH11359
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Giunta, Michele. Precision Measurement of the Top Quark Mass at CDF. United States: N. p., 2007. Web. doi:10.2172/1415837.
Giunta, Michele. Precision Measurement of the Top Quark Mass at CDF. United States. doi:10.2172/1415837.
Giunta, Michele. Fri . "Precision Measurement of the Top Quark Mass at CDF". United States. doi:10.2172/1415837. https://www.osti.gov/servlets/purl/1415837.
@article{osti_1415837,
title = {Precision Measurement of the Top Quark Mass at CDF},
author = {Giunta, Michele},
abstractNote = {},
doi = {10.2172/1415837},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jun 01 00:00:00 EDT 2007},
month = {Fri Jun 01 00:00:00 EDT 2007}
}

Thesis/Dissertation:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this thesis or dissertation.

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  • We report a measurement of the top quark mass with the upgraded collider detector at Fermilab (CDF-II). The top quarks are produced in pairs (tt) in proton-antiproton collisions with a center-of-mass energy of 1.96 TeV.
  • The authors describe a measurement of the top quark mass using events with two charged leptons collected by the CDF II Detector from pmore » $$\bar{p}$$ collisions with √s = 1.96 TeV at the Fermilab Tevatron. The posterior probability distribution of the top quark pole mass is calculated using the differential cross-section for the t$$\bar{t}$$ production and decay expressed with respect to observed leptons and jets momenta. The presence of background events in the collected sample is modeled using calculations of the differential cross-sections for major background processes. This measurement represents the first application of this method to events with two charged leptons. In a data sample with integrated luminosity of 340 pb -1, they observe 33 candidate events and measure M top = 165.2 ± 61. stat ± 3.4 syst GeV/c 2.« less
  • The top quark, the most recently discovered quark, is the most massive known fundamental fermion. Precision measurements of its mass, a free parameter in the Standard Model of particle physics, can be used to constrain the mass of the Higgs Boson. In addition, deviations in the mass as measured in different channels can provide possible evidence for new physics. We describe a measurement of the top quark mass in the decay channel with two charged leptons, known as the dilepton channel, using data collected by the CDF II detector from pmore » $$\bar{p}$$ collisions with √s = 1.96 TeV at the Fermilab Tevatron. The likelihood in top mass is calculated for each event by convolving the leading order matrix element describing q$$\bar{q}$$ → t$$\bar{t}$$ → bℓv $$\bar{b}$$ℓ'v ℓ' with detector resolution functions. The presence of background events in the data sample is modeled using similar calculations involving the matrix elements for major background processes. In a data sample with integrated luminosity of 1.0 fb -1, we observe 78 candidate events and measure M t = 164.5 ± 3.9(stat.) ± 3.9(syst.) GeV/c 2, the most precise measurement of the top quark mass in this channel to date.« less
  • 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
  • We present a measurement of the single top quark cross section in the lepton plus jets final state using an integrated luminosity corresponding to 7.5 fb -1 of p\bar p collision data collected by the Collider Detector at Fermilab. The single top candidate events are identified by the signature of a charged lepton, large missing transverse energy, and two or three jets with at least one of them identified as originating from a bottom quark. A new Monte Carlo generator POWHEG is used to model the single top quark production processes, which include s-channel, t-channel, and Wt-channel. A neural network multivariate method is exploited to discriminate the single top quark signal from the comparatively large backgrounds. We measure a single top production cross section ofmore » $$3.04^{+0.57}_{-0.53} (\mathrm{stat.~+~syst.})$$ pb assuming $$m_{\rm top}=172.5$$~GeV/$c^2$. In addition, we extract the CKM matrix element value $$|V_{tb}|=0.96\pm 0.09~(\mathrm{stat.~+~syst.})\ ± 0.05~(\mathrm{theory})$$ and set a lower limit of $$|V_{tb}|>0.78$$ at the 95% credibility level.« less