skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Observation of $$t\bar{t}$$ Quark Production Using a Soft Lepton B Tag in $$p\bar{p}$$ Collisions at $$\sqrt{s}$$ = 1.8-TeV

Abstract

This thesis presents the results of a search for $$t\bar{t}$$ production in 110 $$pb^{-1}$$ of $$p\bar{p}$$ collisions at $$\sqrt{s}$$=l.8 TeV. The data were collected using the Collider Detector at Ferrnilab (CDF). The search identifies events consistent with the Standard Model decay ($$t\bar{t} \to W^+ bW^- \bar{b}$$). W bosons are identified by the presence of high momentum electrons or muons associated with missing energy transverse to the beam. At least three jets are required to reduce the background from W bosons produced with associated jets. Finally the presence of a b-quark is inferred by searching for a soft lepton from the semileptonic decay ($$b \to \ell \nu X$$) or the sequential decay ($$b \to c \to \ell \nu X$$). Backgrounds from falCe leptons or from real leptons occurring in generic jets are estimated from the data and account for 903 of the total background. The remaining backgrounds from Drell-Yan, $$Z \to \pi^+\pi^-$$, $$Wc, b\bar{b}$$ and Diboson production are estimated from a combination of Monte Carlo simulated events and data. Forty candidate events are identified containing 44 soft lepton tags with an expected background of 24.6 ± 3.0 tags. The probability of the background fluctuating upward to give the observed excess ismore » 0.183. The acceptance for top quark events is calculated and the tl cross section measured to be $$\sigma_{t\bar{t}}$$ = 8.5 ± 3.4 pb. The results of this analysis are combined with the results of other searches and a kinematic fit for the top mass is performed yielding a top mass of 175.6 ± 5.7 (stat) ± 7.1 ( syst) Ge V / $$c^2$$ . For the measured mass the cross section is in good agreement with predictions from the Standard Model.« less

Authors:
 [1]
  1. Harvard Univ., Cambridge, MA (United States)
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:
1372334
Report Number(s):
FERMILAB-THESIS-1996-48; HUHEPL-22; UMI-96-31521
428315
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

Kestenbaum, David Samuel. Observation of $t\bar{t}$ Quark Production Using a Soft Lepton B Tag in $p\bar{p}$ Collisions at $\sqrt{s}$ = 1.8-TeV. United States: N. p., 1996. Web. doi:10.2172/1372334.
Kestenbaum, David Samuel. Observation of $t\bar{t}$ Quark Production Using a Soft Lepton B Tag in $p\bar{p}$ Collisions at $\sqrt{s}$ = 1.8-TeV. United States. https://doi.org/10.2172/1372334
Kestenbaum, David Samuel. Sat . "Observation of $t\bar{t}$ Quark Production Using a Soft Lepton B Tag in $p\bar{p}$ Collisions at $\sqrt{s}$ = 1.8-TeV". United States. https://doi.org/10.2172/1372334. https://www.osti.gov/servlets/purl/1372334.
@article{osti_1372334,
title = {Observation of $t\bar{t}$ Quark Production Using a Soft Lepton B Tag in $p\bar{p}$ Collisions at $\sqrt{s}$ = 1.8-TeV},
author = {Kestenbaum, David Samuel},
abstractNote = {This thesis presents the results of a search for $t\bar{t}$ production in 110 $pb^{-1}$ of $p\bar{p}$ collisions at $\sqrt{s}$=l.8 TeV. The data were collected using the Collider Detector at Ferrnilab (CDF). The search identifies events consistent with the Standard Model decay ($t\bar{t} \to W^+ bW^- \bar{b}$). W bosons are identified by the presence of high momentum electrons or muons associated with missing energy transverse to the beam. At least three jets are required to reduce the background from W bosons produced with associated jets. Finally the presence of a b-quark is inferred by searching for a soft lepton from the semileptonic decay ($b \to \ell \nu X$) or the sequential decay ($b \to c \to \ell \nu X$). Backgrounds from falCe leptons or from real leptons occurring in generic jets are estimated from the data and account for 903 of the total background. The remaining backgrounds from Drell-Yan, $Z \to \pi^+\pi^-$, $Wc, b\bar{b}$ and Diboson production are estimated from a combination of Monte Carlo simulated events and data. Forty candidate events are identified containing 44 soft lepton tags with an expected background of 24.6 ± 3.0 tags. The probability of the background fluctuating upward to give the observed excess is 0.183. The acceptance for top quark events is calculated and the tl cross section measured to be $\sigma_{t\bar{t}}$ = 8.5 ± 3.4 pb. The results of this analysis are combined with the results of other searches and a kinematic fit for the top mass is performed yielding a top mass of 175.6 ± 5.7 (stat) ± 7.1 ( syst) Ge V / $c^2$ . For the measured mass the cross section is in good agreement with predictions from the Standard Model.},
doi = {10.2172/1372334},
url = {https://www.osti.gov/biblio/1372334}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {6}
}

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.

Save / Share: