Measurement of the t¯tW and t¯tZ 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 bosons have been measured using data from pp collisions at √s = 8TeV. The dataset corresponds to an integrated luminosity of 20.3 fb-1 collected by the ATLAS detector in 2012 at the LHC. Final states with two, three...
| Autores: | , , , , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2015 |
| País: | Argentina |
| Recursos: | Universidad Nacional de La Plata |
| Repositorio: | SEDICI (UNLP) |
| Idioma: | inglés |
| OAI Identifier: | oai:sedici.unlp.edu.ar:10915/79116 |
| Acesso em linha: | http://sedici.unlp.edu.ar/handle/10915/79116 |
| Access Level: | acceso abierto |
| Palavra-chave: | Ciencias Exactas Física electroweak interaction hadron-hadron scattering top physics |
| Resumo: | The production cross sections of top-quark pairs in association with massive vector bosons have been measured using data from pp collisions at √s = 8TeV. The dataset corresponds to an integrated luminosity of 20.3 fb-1 collected by the ATLAS detector in 2012 at the LHC. Final states with two, three or four leptons are considered. A fit to the data considering the t¯tW and t¯tZ processes simultaneously yields a significance of 5.0σ (4.2σ) over the background-only hypothesis for t¯tW (t¯tZ) production. The measured cross sections are t¯tW = 369+100 -91 fb and t¯tZ = 176+58 -52 fb. The background-only hypothesis with neither t¯tW nor t¯tZ production is excluded at 7.1σ. All measurements are consistent with next-to-leading-order calculations for the t¯tW and t¯tZ processes. |
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