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Thèse de Doctorat
DOI
https://doi.org/10.11606/T.43.2019.tde-17052019-154625
Document
Auteur
Nom complet
Simão Paulo Silva
Unité de l'USP
Domain de Connaissance
Date de Soutenance
Editeur
São Paulo, 2019
Directeur
Jury
Leite, Marco Aurelio Lisboa (Président)
Begalli, Márcia
Fauth, Anderson Campos
Moralles, Mauricio
Munhoz, Marcelo Gameiro
Titre en portugais
Medidas da produção de bósons W no canal de elétrons em colisões próton-próton a s = 13 TeV no experimento ATLAS
Mots-clés en portugais
Bosons W
detector ATLAS.
LHC
Resumé en portugais
Este trabalho apresenta os resultados da primeira medida da secao de choque de producao W± e± utilizando dados de colisoes proton-proton com energia de centro de massa s = 13 TeV pelo detector ATLAS em dois regimes diferentes de operacao do Large Hadron Collider (LHC): um perodo de baixa luminosidade em que foram acumulados 81 pb1 de dados e que permitiram medir a secao de choque fiducial e total da producao de bosons W+ e W na regiao inclusiva (regiao de massa transversa acima de 50 GeV, abrangendo o pico de massa transversa do boson W) e um perodo de alta luminosidade em que foi obtido 76,6 fb1 de dados tornando acessvel a medida da secao de choque fiducial de producao de bosons W+ e W na regiao de alta massa transversa (regiao de massa transversa entre 130 GeV e 2,5 TeV). As secoes de choque medidas e as distribuicoes cinematicas referentes a energia transversa faltante (ETmiss ), massa transversa do boson W (mTW), pseudorapidez (), momento transverso (pTe) do eletron decorrente do decaimento do W e a diferenca entre o angulo azimutal () do eletron e da ETmiss sao consistentes com previsoes teoricas obtidas em NLO e normalizadas em NNLO, considerando-se as incertezas sistematicas, estatsticas e na luminosidade.
Titre en anglais
Measurements of W boson production in the electron channel in proton-proton collisions at s = 13 TeV in the ATLAS experiment
Mots-clés en anglais
ATLAS detector
LHC
W bosons
Resumé en anglais
This work presents the results of the first W± e± production cross section measurements in the proton-proton collisions at the center of mass energy of s = 13 TeV obtained with the ATLAS detector in two different operation regimes: a low luminosity period when 81pb1 of data was accumulated allowing the measurement of the fiducial and total production cross section of W+ and W bosons in the inclusive region (region of transverse mass above 50 GeV, covering the transverse mass peak of the W boson) and a high luminosity period when 76,6 fb1 made accessible the high W boson transverse mass region (between 130 GeV and 2.5 TeV), allowing the measurement of the fiducial cross section of W+ and W boson production. The measured cross sections and the kinematic distributions for the missing transverse energy, (ETmiss), W boson transverse mass (mTW), the pseudorapidity (), the transverse momentum (pTe) of the electron originated from the W boson decay as well as the azimuthal angle difference () between the electron and the ETmiss are consistent with the theoretical predictions obtained at NLO and normalized to NNLO, considering the systematic, statistical and luminosity uncertainties.
 
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Date de Publication
2019-05-31
 
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