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Title: A Measurement of the Top Quark Mass in the Dilepton Decay Channel at CDF II

Abstract

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 p$$\bar{p}$$ 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.

Authors:
 [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
892485
Report Number(s):
FERMILAB-THESIS-2006-17
TRN: US0701012
DOE Contract Number:
AC02-76CH03000
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCURACY; DECAY; FERMILAB COLLIDER DETECTOR; FERMILAB TEVATRON; HIGGS BOSONS; LEPTONS; LUMINOSITY; MATRIX ELEMENTS; PHYSICS; RESOLUTION; STANDARD MODEL; T QUARKS; Experiment-HEP

Citation Formats

Jayatilaka, Bodhitha A. A Measurement of the Top Quark Mass in the Dilepton Decay Channel at CDF II. United States: N. p., 2006. Web. doi:10.2172/892485.
Jayatilaka, Bodhitha A. A Measurement of the Top Quark Mass in the Dilepton Decay Channel at CDF II. United States. doi:10.2172/892485.
Jayatilaka, Bodhitha A. Sun . "A Measurement of the Top Quark Mass in the Dilepton Decay Channel at CDF II". United States. doi:10.2172/892485. https://www.osti.gov/servlets/purl/892485.
@article{osti_892485,
title = {A Measurement of the Top Quark Mass in the Dilepton Decay Channel at CDF II},
author = {Jayatilaka, Bodhitha A.},
abstractNote = {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 p$\bar{p}$ 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$\bar{t}$ → bℓvℓ$\bar{b}$ℓ'vℓ' 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 Mt = 164.5 ± 3.9(stat.) ± 3.9(syst.) GeV/c2, the most precise measurement of the top quark mass in this channel to date.},
doi = {10.2172/892485},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}

Thesis/Dissertation:
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