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Title: A measurement of the top pair production cross-section in the dilepton channel using lepton plus track selection

Abstract

Using 1.1 fb -1 of data collected by the Collider Detector at Fermilab (CDF) from Run II of the Fermilab Tevatron, they measure the t$$\bar{t}$$ production cross section in events with two leptons, significant missing transverse energy, and ≥ 2 jets. As the Run II dataset grows, more stringent tests of Standard Model predictions for the top quark sector are becoming possible. The dilepton channel, where both top quarks decay t → Wb → ℓvb, is of particular interest due to its high purity even in the absence of a b jet 'tagging' requirement. Use of an isolated track as the second lepton significant increases the dilepton acceptance, at the price of some increase in background, particular from W + jets events where one of the jets is identified as a lepton. With the amount of data available, it has been possible to improve the estimate of the contribution from that background, reflected in a reduced systematic uncertainty. Assuming a branching ratio of BR(W → ℓv) = 10.8% and a top mass of m t = 175 GeV/c 2, the measured cross-section is σ(p$$\bar{p}$$ → t$$\bar{t}$$) = 8.3 ± 1.3(stat.) ± 0.7(syst.) ± 0.5(lumi.) pb. The result is consistent with the Standard Model prediction of 6.7$$+0.7\atop{-0.9}$$ pb and represents a significant improvement in precision over previous results using this selection.

Authors:
 [1]
  1. Univ. of California, Santa Barbara, CA (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
923064
Report Number(s):
FERMILAB-THESIS-2007-49
TRN: US0801962
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCURACY; BRANCHING RATIO; CROSS SECTIONS; DECAY; FERMILAB COLLIDER DETECTOR; FERMILAB TEVATRON; FORECASTING; LEPTONS; PAIR PRODUCTION; PRICES; PRODUCTION; STANDARD MODEL; T QUARKS; TRANSVERSE ENERGY; Experiment-HEP

Citation Formats

Mills, Corrinne Elaine. A measurement of the top pair production cross-section in the dilepton channel using lepton plus track selection. United States: N. p., 2007. Web. doi:10.2172/923064.
Mills, Corrinne Elaine. A measurement of the top pair production cross-section in the dilepton channel using lepton plus track selection. United States. doi:10.2172/923064.
Mills, Corrinne Elaine. Fri . "A measurement of the top pair production cross-section in the dilepton channel using lepton plus track selection". United States. doi:10.2172/923064. https://www.osti.gov/servlets/purl/923064.
@article{osti_923064,
title = {A measurement of the top pair production cross-section in the dilepton channel using lepton plus track selection},
author = {Mills, Corrinne Elaine},
abstractNote = {Using 1.1 fb-1 of data collected by the Collider Detector at Fermilab (CDF) from Run II of the Fermilab Tevatron, they measure the t$\bar{t}$ production cross section in events with two leptons, significant missing transverse energy, and ≥ 2 jets. As the Run II dataset grows, more stringent tests of Standard Model predictions for the top quark sector are becoming possible. The dilepton channel, where both top quarks decay t → Wb → ℓvb, is of particular interest due to its high purity even in the absence of a b jet 'tagging' requirement. Use of an isolated track as the second lepton significant increases the dilepton acceptance, at the price of some increase in background, particular from W + jets events where one of the jets is identified as a lepton. With the amount of data available, it has been possible to improve the estimate of the contribution from that background, reflected in a reduced systematic uncertainty. Assuming a branching ratio of BR(W → ℓv) = 10.8% and a top mass of mt = 175 GeV/c2, the measured cross-section is σ(p$\bar{p}$ → t$\bar{t}$) = 8.3 ± 1.3(stat.) ± 0.7(syst.) ± 0.5(lumi.) pb. The result is consistent with the Standard Model prediction of 6.7$+0.7\atop{-0.9}$ pb and represents a significant improvement in precision over previous results using this selection.},
doi = {10.2172/923064},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2007},
month = {6}
}

Thesis/Dissertation:
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