Measurement of W +/- Z production cross sections and gauge boson polarisation in pp collisions at root s=13 TeV with the ATLAS detector
AffiliationUniv Arizona, Dept Phys
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CitationAaboud, M., Aad, G., Abbott, B., Abdinov, O., Abeloos, B., Abhayasinghe, D. K., ... & Abreu, H. (2019). Measurement of W +/- Z production cross sections and gauge boson polarisation in pp collisions at root s=13 TeV with the ATLAS detector. The European Physical Journal C, 79(6), 535.
JournalEUROPEAN PHYSICAL JOURNAL C
Rights© CERN for the benefit of the ATLAS collaboration 2019 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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AbstractThis paper presents measurements of W +/- Z production cross sections in pp collisions at a centre-of-mass energy of 13TeV. 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 sigma W +/- Zfid.=63.7fb, reproduced by the next-to-next-to-leading-order Standard Model prediction of 61.5-1.3+1.4fb. 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.
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VersionFinal published version
SponsorsANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW, Austria; FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq, Brazil; FAPESP, Brazil; NSERC, Canada; CFI, Canada; CONICYT, Chile; NSFC, China; COLCIEN-CIAS, Colombia; MSMT CR, Czech Republic; MPO CR, Czech Republic; VSC CR, Czech Republic; DNRF, Denmark; DNSRC, Denmark; CEA-DRF/IRFU, France; BMBF, Germany; MPG, Germany; GSRT, Greece; RGC, Hong Kong SAR, China; ISF, Israel; Benoziyo Center, Israel; INFN, Italy; MEXT, Japan; JSPS, Japan; CNRST, Morocco; RCN, Norway; MNiSW, Poland; NCN, Poland; FCT, Portugal; MNE/IFA, Romania; NRC KI, Russian Federation; MESTD, Serbia; MSSR, Slovakia; ARRS, Slovenia; MIZS, Slovenia; MINECO, Spain; Wallenberg Foundation, Sweden; SNSF,Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; NSF, USA; BCKDF, Canada; CANARIE, Canada; COST; ERDF; Marie Sklodowska-Curie Actions, European Union; Investissements d' Avenir Labex, France; ANR, France; DFG, Germany; AvH Foundation, Germany; Greek NSRF, Greece; GIF, Israel; CERCA Programme Generalitat de Catalunya, Spain; Royal Society, UK; Leverhulme Trust, UK; CERN; CAS, China; MOST, China; IN2P3-CNRS, France; SRNSFG,Georgia; HGF, Germany; NWO, Netherlands; MES of Russia; JINR; DST/NRF, South Africa; SRC, Sweden; SERI,Geneva, Switzerland; Cantons of Bern and Geneva, Switzerland; STFC, UK; DOE, USA; Compute Canada, Canada; ERC; Horizon 2020; Idex, France; EU-ESF, Greece; BSFNSF,Israel