Measurement of the tt¯W and tt¯Z production cross sections in pp collisions at s√=8 TeV with the ATLAS detector

The production cross sections of top-quark pairs in association with massive vector bosonshave been measured using data from pp collisions at √s = 8 TeV. The dataset correspondsto an integrated luminosity of 20.3 fb−1collected by the ATLAS detector in 2012at the LHC. Final states with two, three or...

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Detalhes bibliográficos
Autores: Aad, G., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdinov, O., Otero y Garzon, Gustavo Javier, Piegaia, Ricardo Nestor, Sacerdoti, Sabrina, Reisin, Hernan Diego, Alconada Verzini, María Josefina, Alonso, Francisco, Anduaga, Xabier Sebastian, Arduh, Francisco Anuar, Dova, Maria Teresa, Monticelli, Fernando Gabriel, Wahlberg, Hernan Pablo, Zhukov, K., Zibell, A., Zieminska, D., Zimine, N. I., Zimmermann, C., Zimmermann, R., Zimmermann, S., Ziolkowski, M., Zobernig, G., Zoccoli, A., Nedden, M. zur, Zurzolo, G., Zutshi, V., Zwalinski, L., The ATLAS Collaboration
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2015
País:Argentina
Recursos:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/112255
Acesso em linha:http://hdl.handle.net/11336/112255
Access Level:acceso abierto
Palavra-chave:ATLAS
Top
Cross Section
https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
Descrição
Resumo:The production cross sections of top-quark pairs in association with massive vector bosonshave been measured using data from pp collisions at √s = 8 TeV. The dataset correspondsto an integrated luminosity of 20.3 fb−1collected by the ATLAS detector in 2012at the LHC. Final states with two, three or four leptons are considered. A fit to the dataconsidering the ttW¯ and ttZ¯ processes simultaneously yields a significance of 5.0σ (4.2σ)over the background-only hypothesis for ttW¯ (ttZ¯ ) production. The measured cross sectionsare σttW¯ = 369+100−91 fb and σttZ¯ = 176+58−52 fb. The background-only hypothesis with neitherttW¯ nor ttZ¯ production is excluded at 7.1σ. All measurements are consistent with next-toleading-ordercalculations for the ttW¯ and ttZ¯ processes.

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