Search for long-lived stopped R-hadrons decaying out-of-time with pp collisions using the ATLAS detector

An updated search is performed for gluino, top squark, or bottom squark R-hadrons that have come to rest within the ATLAS calorimeter, and decay at some later time to hadronic jets and a neutralino, using 5.0 and 22.9 fb-1 of pp collisions at 7 and 8 TeV, respectively. Candidate decay events are tri...

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Detalles Bibliográficos
Autores: Aad, G., Abajyan, T., Abbott, B., Abdallah, J., Abdel Khalek, S., Alonso, Francisco, Anduaga, Xabier Sebastian, Dova, Maria Teresa, González Silva, María Laura, Monticelli, Fernando Gabriel, Otero y Garzon, Gustavo Javier, Piegaia, Ricardo Nestor, Romeo, Gaston Leonardo, Tripiana, Martin Fernando, Zhuang, X., Zibell, A., Zieminska, D., Zimin, N. I., Zimmermann, C., Zimmermann, R., Zimmermann, S., Ziolkowski, M., Zitoun, R., Živković, L., Zobernig, G., Zoccoli, A., zur Nedden, M., Zurzolo, G., Zutshi, V., Zwalinski, L.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2013
País:Argentina
Institución:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/29182
Acceso en línea:http://hdl.handle.net/11336/29182
Access Level:acceso abierto
Palabra clave:R-hadrons
SUSY
ATLAS
LHC
https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
Descripción
Sumario:An updated search is performed for gluino, top squark, or bottom squark R-hadrons that have come to rest within the ATLAS calorimeter, and decay at some later time to hadronic jets and a neutralino, using 5.0 and 22.9 fb-1 of pp collisions at 7 and 8 TeV, respectively. Candidate decay events are triggered in selected empty bunch crossings of the LHC in order to remove pp collision backgrounds. Selections based on jet shape and muon-system activity are applied to discriminate signal events from cosmic ray and beam-halo muon backgrounds. In the absence of an excess of events, improved limits are set on gluino, stop, and sbottom masses for different decays, lifetimes, and neutralino masses. With a neutralino of mass 100 GeV, the analysis excludes gluinos with mass below 832 GeV (with an expected lower limit of 731 GeV), for a gluino lifetime between 10 microseconds and 1000 s in the generic R-hadron model with equal branching ratios for decays to qqbar+neutralino and gluon+neutralino. Under the same assumptions for the neutralino mass and squark lifetime, top squarks and bottom squarks in the Regge R-hadron model are excluded with masses below 379 and 344 GeV, respectively.

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