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 ± 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 inclusi...
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| Formato: | JOUR |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_03702693_v759_n_p601_Aad |
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| Sumario: | 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)±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. © 2016 The Author(s) |
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