Measurements of the Wï¿½→ℓï¿½ν and Z→ℓ+ℓ− production cross sections (where ℓï¿½=eï¿½,μï¿½) in proton–proton collisions at s=13ï¿½TeV 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 Wï¿½-boson production cross sections times the single-lepton-flavour branching ratios are σW+ tot=11.83ï¿½0.02ï¿½(stat)ï¿½0.32ï¿½(sys)ï¿½0.25ï¿½(lumi)ï¿½nb and σW− tot=8.79ï¿½0.02ï¿½(stat)ï¿½0.24ï¿½(sys)ï¿½0.18ï¿½(lumi)ï¿½nb for W+ and W−, respectively. The total inclusive Z-boson production cross section times leptonic branching ratio, within the invariant mass window 66<mℓℓ<116ï¿½GeV, is σZ tot=1.981ï¿½0.007ï¿½(stat)ï¿½0.038ï¿½(sys)ï¿½0.042ï¿½(lumi)ï¿½nb. 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 σW+ fid/σW− fid=1.295ï¿½0.003ï¿½(stat)ï¿½0.010ï¿½(sys) and σWï¿½ fid/σZ fid=10.31ï¿½0.04ï¿½(stat)ï¿½0.20ï¿½(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.
|Number of pages||21|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2016 Aug 10|
ASJC Scopus subject areas
- Nuclear and High Energy Physics