Measurement of W ± and Z -boson production cross sections in pp collisions ats=13 TeVwith the ATLAS detector

G. Aad, B. Abbott, J. Abdallah, O. Abdinov, B. Abeloos, R. Aben, O.S. AbouZeid, N.L. Abraham, H. Abramowicz, H. Abreu, R. Abreu, Y. Abulaiti (+2838 others)
2016 Physics Letters B  
Measurements of the W^±→ℓ^±ν and Z →ℓ^+ ℓ^- production cross sections (where ℓ^±=e^±,μ^±) in proton-proton collisions at √(s)=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^±-boson production cross sections times the single-lepton-flavour branching ratios are σ_W^+^tot= 11.83 ± 0.02 (stat) ± 0.32 (sys) ± 0.25 (lumi) nb and σ_W^-^tot = 8.79 ± 0.02 (stat) ± 0.24 (sys) ±
more » ... 0.18 (lumi) nb for W^+ and W^-, respectively. The total inclusive Z-boson production cross section times leptonic branching ratio, within the invariant mass window 66 < m_ℓℓ < 116 GeV, is σ_Z^tot = 1.981 ± 0.007 (stat) ± 0.038 (sys) ± 0.042 (lumi) nb. The 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 σ_W^+^fid/σ_W^-^fid = 1.295 ± 0.003 (stat) ± 0.010 (sys) and σ_W^±^fid/σ_Z^fid = 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.
doi:10.1016/j.physletb.2016.06.023 fatcat:esuoats7ejaybcxobqbrng2pwi