Please use this identifier to cite or link to this item: https://hdl.handle.net/10316/106898
Title: Measurement of W±Z production cross sections and gauge boson polarisation in pp collisions at √s=13TeV with the ATLAS detector
Authors: Santos, S. P. Amor dos 
Fiolhais, M. C. N. 
Galhardo, B. 
Veloso, F. 
Wolters, H. 
ATLAS Collaboration
Issue Date: 2019
Publisher: Springer Nature
metadata.degois.publication.title: European Physical Journal C
metadata.degois.publication.volume: 79
metadata.degois.publication.issue: 6
Abstract: This paper presents measurements of W±Z production cross sections in pp collisions at a centre-of-mass energy of 13 TeV. The data were collected in 2015 and 2016 by the ATLAS experiment at the Large Hadron Collider, and correspond to an integrated luminosity of 36.1fb-1. The W±Z candidate events are reconstructed using leptonic decay modes of the gauge bosons into electrons and muons. The measured inclusive cross section in the detector fiducial region for a single leptonic decay mode is σW±Z→ℓ′νℓℓfid.=63.7±1.0(stat.)±2.3(syst.)±1.4(lumi.) fb, reproduced by the next-to-next-to-leading-order Standard Model prediction of 61.5-1.3+1.4 fb. Cross sections for W+Z and W-Z production and their ratio are presented as well as differential cross sections for several kinematic observables. An analysis of angular distributions of leptons from decays of W and Z bosons is performed for the first time in pair-produced events in hadronic collisions, and integrated helicity fractions in the detector fiducial region are measured for the W and Z bosons separately. Of particular interest, the longitudinal helicity fraction of pair-produced vector bosons is also measured.
URI: https://hdl.handle.net/10316/106898
DOI: 10.1140/epjc/s10052-019-7027-6
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

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