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Title: Measurement of top quark polarization in top-antitop lepton+jets final states at DØ

Abstract

This thesis presents a measurement of the top quark polarization in the $$t\overline{t}$$ events produced in $$p\overline{p}$$ collisions at $$\sqrt{s}=1.96$$ TeV using data corresponding to 9.7 fb$$^{-1}$$ of integrated luminosity collected with the D0 detector at the Fermilab Tevatron Collider. The final states used in the measurement contain one lepton and at least three jets. The polarization is measured using the angular distribution of leptons along three different axes: the beam axis, the helicity axis, and the transverse axis normal to the $$t\overline{t}$$ production plane. This is the first measurement of top quark polarization at the Tevatron Collider in lepton+jets final states, and the first measurement of transverse polarization in $$t\overline{t}$$ production. The polarization along the beam axis is combined with the previous result in the dilepton final states by the D0 experiment. The observed distributions are consistent with the Standard Model of nearly no polarization and no indication for beyond Standard Model physics is observed. The measurement offers legacy result from unique Tevatron Collider data and provides more information about the top quark production and decays, about the properties of the heaviest elementary particle.

Authors:
 [1]
  1. Czech Technical Univ., Prague (Czech Republic)
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:
1347928
Report Number(s):
FERMILAB-THESIS-2017-06
1518866
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

Augsten, Kamil. Measurement of top quark polarization in top-antitop lepton+jets final states at DØ. United States: N. p., 2017. Web. doi:10.2172/1347928.
Augsten, Kamil. Measurement of top quark polarization in top-antitop lepton+jets final states at DØ. United States. doi:10.2172/1347928.
Augsten, Kamil. Sun . "Measurement of top quark polarization in top-antitop lepton+jets final states at DØ". United States. doi:10.2172/1347928. https://www.osti.gov/servlets/purl/1347928.
@article{osti_1347928,
title = {Measurement of top quark polarization in top-antitop lepton+jets final states at DØ},
author = {Augsten, Kamil},
abstractNote = {This thesis presents a measurement of the top quark polarization in the $t\overline{t}$ events produced in $p\overline{p}$ collisions at $\sqrt{s}=1.96$ TeV using data corresponding to 9.7 fb$^{-1}$ of integrated luminosity collected with the D0 detector at the Fermilab Tevatron Collider. The final states used in the measurement contain one lepton and at least three jets. The polarization is measured using the angular distribution of leptons along three different axes: the beam axis, the helicity axis, and the transverse axis normal to the $t\overline{t}$ production plane. This is the first measurement of top quark polarization at the Tevatron Collider in lepton+jets final states, and the first measurement of transverse polarization in $t\overline{t}$ production. The polarization along the beam axis is combined with the previous result in the dilepton final states by the D0 experiment. The observed distributions are consistent with the Standard Model of nearly no polarization and no indication for beyond Standard Model physics is observed. The measurement offers legacy result from unique Tevatron Collider data and provides more information about the top quark production and decays, about the properties of the heaviest elementary particle.},
doi = {10.2172/1347928},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2017},
month = {Sun Jan 01 00:00:00 EST 2017}
}

Thesis/Dissertation:
Other availability
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