Measurement of angular correlations in Drell–Yan lepton pairs to probe Z/γ ⁎ boson transverse momentum at √s=7 TeV with the ATLAS detector
A measurement of angular correlations in Drell–Yan lepton pairs via the ϕ η ⁎ 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...
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2013
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v720_n1-3_p32_Aad http://hdl.handle.net/20.500.12110/paper_03702693_v720_n1-3_p32_Aad |
| Aporte de: |
| Sumario: | A measurement of angular correlations in Drell–Yan lepton pairs via the ϕ η ⁎ 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 ϕ η ⁎ 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 ϕ η ⁎ 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. © 2013 CERN |
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