INVESTIGADORES
MONTICELLI Fernando Gabriel
artículos
Título:
Measurement of the tt¯W and tt¯Z production cross sections in pp collisions at s√=8 TeV with the ATLAS detector
Autor/es:
F. MONTICELLI; ATLAS COLLABORATION
Revista:
JOURNAL OF HIGH ENERGY PHYSICS
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2015 vol. 1 p. 1 - 20
ISSN:
1126-6708
Resumen:
The production cross sections of top-quark pairs in association with massive vector bosons have been measured using data from pp collisions at s√=8 TeV. 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 tt¯W and tt¯Z processes simultaneously yields a significance of 5.0σ (4.2σ) over the background-only hypothesis for tt¯W ( tt¯Z ) production. The measured cross sections are σtt¯W=369+100−91 fb and σtt¯Z=176+58−52 fb. The background-only hypothesis with neither tt¯W nor tt¯Z production is excluded at 7.1σ. All measurements are consistent with next-to-leading-order calculations for the tt¯W and tt¯Z processes.