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Measurement of the W-+/- Z boson pair-production cross section in pp collisions at root s=13 TeV with the ATLAS detector

Publikace na Matematicko-fyzikální fakulta |
2016

Tento text není v aktuálním jazyce dostupný. Zobrazuje se verze "en".Abstrakt

The production of W+- Z events in proton-proton collisions at a centre-of-mass energy of 13 TeV is measured with the ATLAS detector at the LHC. The collected data correspond to an integrated luminosity of 3.2 fbMINUS SIGN 1.

The W+- Z candidates are reconstructed using leptonic decays of the gauge bosons into electrons or muons. The measured inclusive cross section in the detector fiducial region for leptonic decay modes is σfid.

W+- ZRIGHTWARDS ARROW ν = 63.2 +- 3.2 (stat.) +- 2.6 (sys.) +- 1.5 (lumi.) fb. In comparison, the next-toleading- order Standard Model prediction is 53.4+3.6 MINUS SIGN 2.8 fb.

The extrapolation of the measurement from the fiducial to the total phase space yields σtot. W+- Z = 50.6 +-2.6 (stat.)+- 2.0 (sys.)+-0.9 (th.)+-1.2 (lumi.) pb, in agreement with a recent next-to-next-to-leading-order calculation of 48.2+1.1 MINUS SIGN 1.0 pb.

The cross section as a function of jet multiplicity is also measured, together with the charge-dependent W+ Z and WMINUS SIGN Z cross sections and their ratio.