Measurement of W± and Z-boson production cross sections in pp collisions at s=13 TeV with the ATLAS detector

Measurements of the W±→ℓ±νW±→ℓ±ν and Z→ℓ+ℓ−Z→ℓ+ℓ− production cross sections (where ℓ±=e±,μ±ℓ±=e±,μ±) in proton–proton collisions at View the MathML sources=13 TeV are presented using data recorded by the ATLAS experiment at the Large Hadron Collider, corresponding to a total integrated luminosity of 81 pb−1. The total inclusive W±W±-boson production cross sections times the single-lepton-flavour branching ratios are View the MathML sourceσW+tot=11.83±0.02 (stat)±0.32 (sys)±0.25 (lumi) nb and View the MathML sourceσW−tot=8.79±0.02 (stat)±0.24 (sys)±0.18 (lumi) nb for W+W+ and W−W−, respectively. The total inclusive Z  -boson production cross section times leptonic branching ratio, within the invariant mass window 66<mℓℓ<116 GeV66<mℓℓ<116 GeV, is View the MathML sourceσZtot=1.981±0.007 (stat)±0.038 (sys)±0.042 (lumi) nb. The W+W+, W−W−, and Z  -boson production cross sections and cross-section ratios within a fiducial region defined by the detector acceptance are also measured. The cross-section ratios benefit from significant cancellation of experimental uncertainties, resulting in View the MathML sourceσW+fid/σW−fid=1.295±0.003 (stat)±0.010 (sys) and View the MathML sourceσW±fid/σZfid=10.31±0.04 (stat)±0.20 (sys). Theoretical predictions, based on calculations accurate to next-to-next-to-leading order for quantum chromodynamics and to next-to-leading order for electroweak processes and which employ different parton distribution function sets, are compared to these measurements.We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF and DNSRC, Denmark; IN2P3-CNRS, CEA-DSM/IRFU, France; GNSF, Georgia; BMBF, HGF, and MPG, Germany; GSRT, Greece; RGC, Hong Kong SAR, China; ISF, I-CORE and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; RCN, Norway; MNiSW and NCN, Poland; FCT, Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russian Federation; JINR; MESTD, Serbia; MSSR, Slovakia; ARRS and MIZS, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United Kingdom; DOE and NSF, United States. In addition, individual groups and members have received support from BCKDF, the Canada Council, Canarie, CRC, Compute Canada, FQRNT, and the Ontario Innovation Trust, Canada; EPLANET, ERC, FP7, Horizon 2020 and Marie Sklodowska-Curie Actions, European Union; Investissements d'Avenir Labex and Idex, ANR, Region Auvergne and Fondation Partager le Savoir, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programmes co-financed by EU-ESF and the Greek NSRF; BSF, GIF and Minerva, Israel; BRF, Norway; Generalitat de Catalunya, Generalitat Valenciana, Spain; the Royal Society and Leverhulme Trust, United Kingdom