Search for resonances decaying into top-quark pairs using fully hadronic decays in pp collisions with ATLAS at \sqrt{s}=7 TeV

A search for resonances produced in 7 TeV proton-proton collisions and decaying into top-quark pairs is described. In this Letter events where the top-quark decay produces two massive jets with large transverse momenta recorded with the ATLAS detector at the Large Hadron Collider are considered. Two...

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Detalhes bibliográficos
Autores: Aad, G., Abajyan, T., Abbott, B., Abdallah, J., Abdel Khalek, S., Alonso, Francisco, Anduaga, Xabier Sebastian, Dova, Maria Teresa, Monticelli, Fernando Gabriel, Tripiana, Martin Fernando, Otero y Garzon, Gustavo Javier, Piegaia, Ricardo Nestor, Romeo, G. A., Zhuang, X., Zhuravlov, V., Zibell, A., Zieminska, D., Zimin, N. I., Zimmermann, R., Zimmermann, S., Ziolkowski, M., Zitoun, R., Živković, L., Zmouchko, V. V., Zobernig, G., Zoccoli, A., Nedden, M. zur, Zutshi, V., Zwalinski, L., The ATLAS Collaboration
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2012
País:Argentina
Recursos:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/61777
Acesso em linha:http://hdl.handle.net/11336/61777
Access Level:acceso abierto
Palavra-chave:Top-pairs
Resonances
ATLAS
Proton-proton collisions
https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
Descrição
Resumo:A search for resonances produced in 7 TeV proton-proton collisions and decaying into top-quark pairs is described. In this Letter events where the top-quark decay produces two massive jets with large transverse momenta recorded with the ATLAS detector at the Large Hadron Collider are considered. Two techniques that rely on jet substructure are used to separate top-quark jets from those arising from light quarks and gluons. In addition, each massive jet is required to have evidence of an associated bottom-quark decay. The data are consistent with the Standard Model, and limits can be set on the production cross section times branching fraction of a Z′ boson and a Kaluza-Klein gluon resonance. These limits exclude, at the 95% credibility level, Z′ bosons with masses 0.70-1.00 TeV as well as 1.28-1.32 TeV and Kaluza-Klein gluons with masses 0.70-1.62 TeV.

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