2011/09/15 by Jonathan Anderson, Anderson, Jonathan
Physics and Astronomy · #Boson #Charged particle #Electron #Electroweak interaction #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Invariant mass #Ion #Large Hadron Collider #Lepton #Luminosity #Muon #Neutrino #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Production (economics) #Pseudorapidity #Quantum Chromodynamics and Particle Interactions #Standard Model (mathematical formulation) #hep-ex
paper · pdf · doi:10.48550/arxiv.1109.3371
published in arXiv (Cornell University) (Cornell University)
arxiv created 2011/09/15 · openalex publication_date 2011/09/15 · arxiv updated 2019/08/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Measurements of electroweak boson production in pp collisions at √(s) = 7 TeV are presented using the decays W → μν, Z → μμ and Z → ττ recorded using the LHCb detector at the LHC. For muonic W and Z decays, the data sample corresponds to an integrated luminosity of 37.1 ± 1.3 pb-1. Here the W and Z bosons are reconstructed from muons with transverse momenta, pT, above 20 GeV and pseudorapidity, η, between 2 and 4.5, and, in the case of the Z, a dimuon invariant mass MZ between 60 GeV and 120 GeV. For Z decays to tau lepton final states, 247 pb-1 of data has been used. Here one tau is identified through its decay to a muon and neutrinos; the other through its decay to an electron or muon and neutrinos. The cross-sections are measured to be: σ(W+→μ+ν) = 808 ± 7 ± 28 ± 28 pb; σ(W+→μ+ν) = 634 ± 7 ± 21 ± 22 pb; σ(Z→μμ) = 74.9 ± 1.6 ± 3.8 ± 2.6 pb; σ(Z→ττ) = 82 ± 8 ± 7 ± 4 pb. Here the first error is statistical, the second is systematic and the third is due to the luminosity determination. For muonic final states, differential measurements, cross-section ratios and the W charge asymmetry are also measured in the same kinematic region. The ratio of the Z→ττ and Z→μμ cross-sections has been measured to be 1.09 ± 0.17, consistent with lepton universality. Theoretical predictions, calculated at next-to-next-to-leading order (NNLO) in QCD using recent parton distribution functions, are found to be in agreement with the measurements.