摘要
A measurement of angular correlations in Drell–Yan lepton pairs via the ϕη ⁎ observable is presented. This variable probes the same physics as the Z/γ⁎ boson transverse momentum with a better experimental resolution. The Z/γ⁎→e+e− and Z/γ⁎→μ+μ− decays produced in proton–proton collisions at a centre-of-mass energy of sqrts=7 TeV are used. The data were collected with the ATLAS detector at the LHC and correspond to an integrated luminosity of 4.6 fb−1. Normalised differential cross sections as a function of ϕη ⁎ are measured separately for electron and muon decay channels. These channels are then combined for improved accuracy. The cross section is also measured double differentially as a function of ϕη ⁎ for three independent bins of the Z boson rapidity. The results are compared to QCD calculations and to predictions from different Monte Carlo event generators. The data are reasonably well described, in all measured Z boson rapidity regions, by resummed QCD predictions combined with fixed-order perturbative QCD calculations or by some Monte Carlo event generators. The measurement precision is typically better by one order of magnitude than present theoretical uncertainties.
原文 | English |
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頁(從 - 到) | 32-51 |
頁數 | 20 |
期刊 | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
卷 | 720 |
發行號 | 1-3 |
DOIs | |
出版狀態 | Published - 2013 3月 13 |
All Science Journal Classification (ASJC) codes
- 核能與高能物理