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 proton–proton 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 σ_t t¯ Z= 0.9 ± 0.3 pb and σ_t t¯ W= 1.5 ± 0.8 pb, in agreement with the Standard Model predictions. © 2017, CERN for the benefit of the ATLAS collaboration.

العنوان

European Physical Journal C

الناشر

Springer New York LLC

بلد الناشر

ألمانيا

Indexing

Thomson Reuters

معامل التأثير

14,691

نوع المنشور

مطبوع فقط

المجلد

77

السنة

2017

الصفحات

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