Measurement of W^{± }-boson and Z-boson production cross-sections in pp collisions at √{s}=2.76 TeV with the ATLAS detector

The production cross-sections for W^{± } and Z bosons are measured using ATLAS data corresponding to an integrated luminosity of 4.0 pb^{-1} collected at a centre-of-mass energy √{s}=2.76 TeV. The decay channels W → ℓ ν and Z → ℓ ℓ are used, where ℓ can be an electron or a muon. The cross-sections are presented for a fiducial region defined by the detector acceptance and are also extrapolated to the full phase space for the total inclusive production cross-section. The combined (average) total inclusive cross-sections for the electron and muon channels are: σ ^{ {tot}}_{W+→ ℓ ν }= 2312 ± 26 ( {stat.}) ± 27 ( {syst.}) ± 72 ( {lumi.}) ± 30 ( {extr.}) {pb} , σ ^{ {tot}}_{W-→ ℓ ν }= 1399 ± 21 ( {stat.}) ± 17 ( {syst.}) \± 43 ( {lumi.}) ± 21 ( {extr.}) {pb} , σ ^{ {tot}}_{Z → ℓ ℓ }= 323.4 ± 9.8 ( {stat.}) ± 5.0 ( {syst.})\± 10.0 ( {lumi.}) ± 5.5 ( {extr.}) {pb} . Measured ratios and asymmetries constructed using these cross-sections are also presented. These observables benefit from full or partial cancellation of many systematic uncertainties that are correlated between the different measurements.