A measurement of the tt¯ Z and tt¯ W production cross sections in final states with either two same-charge muons, or three or four leptons (electrons or muons) is presented. The analysis uses a data sample of protonâproton collisions at s=13 TeV recorded with the ATLAS detector at the Large Hadron Collider in 2015, corresponding to a total integrated luminosity of 3.2 fb- 1. The inclusive cross sections are extracted using likelihood fits to signal and control regions, resulting in Ïtt¯Z= 0.9 ± 0.3 pb and Ïtt¯W= 1.5 ± 0.8 pb, in agreement with the Standard Model predictions.
Measurement of the tt¯Z and tt¯W production cross sections in multilepton final states using 3.2 fb -1 of pp collisions at âs = 13 TeV with the ATLAS detector
BARBERIS, DARIO;FAVARETO, ANDREA;FERRETTO PARODI, ANDREA;GAGLIARDI, GUIDO;GAUDIELLO, ANDREA;GUIDO, ELISA;OSCULATI, BIANCA MARIA;PARODI, FABRIZIO;SANNINO, MARIO;SCHIAVI, CARLO;Sforza, F.;
2017-01-01
Abstract
A measurement of the tt¯ Z and tt¯ W production cross sections in final states with either two same-charge muons, or three or four leptons (electrons or muons) is presented. The analysis uses a data sample of protonâproton collisions at s=13 TeV recorded with the ATLAS detector at the Large Hadron Collider in 2015, corresponding to a total integrated luminosity of 3.2 fb- 1. The inclusive cross sections are extracted using likelihood fits to signal and control regions, resulting in Ïtt¯Z= 0.9 ± 0.3 pb and Ïtt¯W= 1.5 ± 0.8 pb, in agreement with the Standard Model predictions.File in questo prodotto:
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