Measurements of top-quark pair spin correlations in the eμ channel at √s = 13 TeV using pp collisions in the ATLAS detector

A measurement of observables sensitive to spin correlations in tt¯ production is presented, using 36.1 fb⁻¹ of pp collision data at √s = 13 TeV recorded with the ATLAS detector at the Large Hadron Collider. Differential cross-sections are measured in events with exactly one electron and one muon wit...

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Autores principales: Alonso, Francisco, Arduh, Francisco Anuar, Dova, María Teresa, Hoya, Joaquín, Monticelli, Fernando Gabriel, Orellana, Gonzalo Enrique, Wahlberg, Hernán Pablo, The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2020
Materias:
Ciencias Exactas
Física
Physics
pp collisions
quarks
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/124676
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-124676
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
Physics
pp collisions
quarks
spellingShingle Ciencias Exactas
Física
Physics
pp collisions
quarks
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Orellana, Gonzalo Enrique
Wahlberg, Hernán Pablo
The ATLAS Collaboration
Measurements of top-quark pair spin correlations in the eμ channel at √s = 13 TeV using pp collisions in the ATLAS detector
topic_facet Ciencias Exactas
Física
Physics
pp collisions
quarks
description A measurement of observables sensitive to spin correlations in tt¯ production is presented, using 36.1 fb⁻¹ of pp collision data at √s = 13 TeV recorded with the ATLAS detector at the Large Hadron Collider. Differential cross-sections are measured in events with exactly one electron and one muon with opposite-sign electric charge as a function of the azimuthal opening angle and the absolute difference in pseudorapidity between the electron and muon candidates in the laboratory frame. The azimuthal opening angle is also measured as a function of the invariant mass of the tt¯ system. The measured differential cross-sections are compared to predictions by several NLO Monte Carlo generators and fixed-order calculations. The observed degree of spin correlation is somewhat higher than predicted by the generators used. The data are consistent with the prediction of one of the fixed-order calculations at NLO, but agree less well with higher-order predictions. Using these leptonic observables, a search is performed for pair production of supersymmetric top squarks decaying into Standard Model top quarks and light neutralinos. Top squark masses between 170 and 230 GeV are largely excluded at the 95% confidence level for kinematically allowed values of the neutralino mass.
format Articulo
Articulo
author Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Orellana, Gonzalo Enrique
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_facet Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Orellana, Gonzalo Enrique
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_sort Alonso, Francisco
title Measurements of top-quark pair spin correlations in the eμ channel at √s = 13 TeV using pp collisions in the ATLAS detector
title_short Measurements of top-quark pair spin correlations in the eμ channel at √s = 13 TeV using pp collisions in the ATLAS detector
title_full Measurements of top-quark pair spin correlations in the eμ channel at √s = 13 TeV using pp collisions in the ATLAS detector
title_fullStr Measurements of top-quark pair spin correlations in the eμ channel at √s = 13 TeV using pp collisions in the ATLAS detector
title_full_unstemmed Measurements of top-quark pair spin correlations in the eμ channel at √s = 13 TeV using pp collisions in the ATLAS detector
title_sort measurements of top-quark pair spin correlations in the eμ channel at √s = 13 tev using pp collisions in the atlas detector
publishDate 2020
url http://sedici.unlp.edu.ar/handle/10915/124676
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