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EnglishDistributions of transverse momentum pllT and the angular variable ϕ∗η of Drell--Yan lepton pairs are measured in 20.3 fb−1 of proton--proton collisions at sqrt(s) = 8 TeV with the ATLAS detector at the LHC. Measurements in electron-pair and muon-pair final states are corrected for detector effects and combined. Compared to previous measurements in proton--proton collisions at sqrt(s) = 7 TeV, these new measurements benefit from a larger data sample and improved control of systematic uncertainties. Measurements are performed in bins of lepton-pair mass above, around and below the Z-boson mass peak. The data are compared to predictions from perturbative and resummed QCD calculations. For values of ϕ∗η<1 the predictions from the Monte Carlo generator ResBos are generally consistent with the data within the theoretical uncertainties. However, at larger values of ϕ∗η this is not generally the case. Monte Carlo generators based on the parton-shower approach are unable to describe the data over the full range of pllT and the fixed-order prediction of DYNNLO falls below the data at high values of pllT. ResBos and the parton-shower Monte Carlo generators provide a much better description of the evolution of the ϕ∗η and pllT distributions as a function of lepton-pair mass and rapidity.
| Titolo: | Measurement of the transverse momentum and phi*_eta distributions of Drell-Yan lepton pairs in proton-proton collisions at sqrt(s) = 8 TeV with the ATLAS detector | |
| Autori: | ||
| Data di pubblicazione: | 2016 | |
| Rivista: | ||
| Abstract: | Distributions of transverse momentum pllT and the angular variable ϕ∗η of Drell--Yan lepton pairs are measured in 20.3 fb−1 of proton--proton collisions at sqrt(s) = 8 TeV with the ATLAS detector at the LHC. Measurements in electron-pair and muon-pair final states are corrected for detector effects and combined. Compared to previous measurements in proton--proton collisions at sqrt(s) = 7 TeV, these new measurements benefit from a larger data sample and improved control of systematic uncertainties. Measurements are performed in bins of lepton-pair mass above, around and below the Z-boson mass peak. The data are compared to predictions from perturbative and resummed QCD calculations. For values of ϕ∗η<1 the predictions from the Monte Carlo generator ResBos are generally consistent with the data within the theoretical uncertainties. However, at larger values of ϕ∗η this is not generally the case. Monte Carlo generators based on the parton-shower approach are unable to describe the data over the full range of pllT and the fixed-order prediction of DYNNLO falls below the data at high values of pllT. ResBos and the parton-shower Monte Carlo generators provide a much better description of the evolution of the ϕ∗η and pllT distributions as a function of lepton-pair mass and rapidity. | |
| Handle: | http://hdl.handle.net/11587/402377 | |
| Appare nelle tipologie: | Articolo pubblicato su Rivista |
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