Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at √s =8 TeV Using the ATLAS Detector

A measurement of spin correlation in tt¯ production is presented using data collected with the ATLAS detector at the Large Hadron Collider in proton-proton collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb-1. The correlation between the top and anti...

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Autor principal: Aad, G.
Formato: JOUR
Materias:
Elementary particles
Photons
Tellurium compounds
Confidence levels
Degree of correlations
Integrated luminosity
Large Hadron Collider
Lightest supersymmetric particles
Proton proton collisions
Spin correlations
The standard model
High energy physics
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00319007_v114_n14_p_Aad
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00319007_v114_n14_p_Aad
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spelling todo:paper_00319007_v114_n14_p_Aad2023-10-03T14:42:35Z Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at √s =8 TeV Using the ATLAS Detector Aad, G. Elementary particles Photons Tellurium compounds Confidence levels Degree of correlations Integrated luminosity Large Hadron Collider Lightest supersymmetric particles Proton proton collisions Spin correlations The standard model High energy physics A measurement of spin correlation in tt¯ production is presented using data collected with the ATLAS detector at the Large Hadron Collider in proton-proton collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb-1. The correlation between the top and antitop quark spins is extracted from dilepton tt¯ events by using the difference in the azimuthal angle between the two charged leptons in the laboratory frame. In the helicity basis the measured degree of correlation corresponds to Ahelicity=0.38±0.04, in agreement with the standard model prediction. A search is performed for pair production of top squarks with masses close to the top quark mass decaying to predominantly right-handed top quarks and a light neutralino, the lightest supersymmetric particle. Top squarks with masses between the top quark mass and 191 GeV are excluded at the 95% confidence level. © 2015 CERN. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00319007_v114_n14_p_Aad
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Elementary particles
Photons
Tellurium compounds
Confidence levels
Degree of correlations
Integrated luminosity
Large Hadron Collider
Lightest supersymmetric particles
Proton proton collisions
Spin correlations
The standard model
High energy physics
spellingShingle Elementary particles
Photons
Tellurium compounds
Confidence levels
Degree of correlations
Integrated luminosity
Large Hadron Collider
Lightest supersymmetric particles
Proton proton collisions
Spin correlations
The standard model
High energy physics
Aad, G.
Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at √s =8 TeV Using the ATLAS Detector
topic_facet Elementary particles
Photons
Tellurium compounds
Confidence levels
Degree of correlations
Integrated luminosity
Large Hadron Collider
Lightest supersymmetric particles
Proton proton collisions
Spin correlations
The standard model
High energy physics
description A measurement of spin correlation in tt¯ production is presented using data collected with the ATLAS detector at the Large Hadron Collider in proton-proton collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb-1. The correlation between the top and antitop quark spins is extracted from dilepton tt¯ events by using the difference in the azimuthal angle between the two charged leptons in the laboratory frame. In the helicity basis the measured degree of correlation corresponds to Ahelicity=0.38±0.04, in agreement with the standard model prediction. A search is performed for pair production of top squarks with masses close to the top quark mass decaying to predominantly right-handed top quarks and a light neutralino, the lightest supersymmetric particle. Top squarks with masses between the top quark mass and 191 GeV are excluded at the 95% confidence level. © 2015 CERN.
format JOUR
author Aad, G.
author_facet Aad, G.
author_sort Aad, G.
title Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at √s =8 TeV Using the ATLAS Detector
title_short Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at √s =8 TeV Using the ATLAS Detector
title_full Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at √s =8 TeV Using the ATLAS Detector
title_fullStr Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at √s =8 TeV Using the ATLAS Detector
title_full_unstemmed Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at √s =8 TeV Using the ATLAS Detector
title_sort measurement of spin correlation in top-antitop quark events and search for top squark pair production in pp collisions at √s =8 tev using the atlas detector
url http://hdl.handle.net/20.500.12110/paper_00319007_v114_n14_p_Aad
work_keys_str_mv AT aadg measurementofspincorrelationintopantitopquarkeventsandsearchfortopsquarkpairproductioninppcollisionsats8tevusingtheatlasdetector
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