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Aad, G.; Abbott, B.; Abdallah, J.; Abdel Khalek, S.; Abdinov, O.; Aben, R.; Abi, B.; Abolins, M.; AbouZeid, O.S.; Abramowicz, H.; Dam, Mogens; Hansen, Jørn Dines; Hansen, Jørgen Beck; Xella, Stefania; Hansen, Peter Henrik; Petersen, Troels Christian; Thomsen, Lotte Ansgaard; Mehlhase, Sascha; Jørgensen, Morten Dam; Pingel, Almut Maria; Løvschall-Jensen, Ask Emil; Alonso Diaz, Alejandro; Monk, James William; Pedersen, Lars Egholm; Wiglesworth, Graig; Galster, Gorm Aske Gram Krohn (2015)
Publisher: American Physical Society
Languages: English
Types: Article
tau+ tau-, 2 [higher-order], Hadron Colliders, QC, 530, Physical Sciences, QCD, 7000 GeV-cms, High Energy Physics - Experiment, Settore FIS/04 - Fisica Nucleare e Subnucleare, CERN LHC Coll, p p --> top anti-top anything, missing-energy [transverse momentum], high [transverse momentum], pp collisions; ATLAS detector, Nuclear and High Energy Physics; Collider Physics; LHC, 1 [higher-order], Nuclear and High Energy Physics, pair production [tau], experimental results, pair production [W], p p --> Z0 anything, LHC, distribution function [parton], Parton Distributions, pair production [top], Fysik, Science & Technology, Física, Settore FIS/01 - Fisica Sperimentale, p p --> W+ W- anything, multiplicity [jet]--> Subjects: scattering [p p], final state [dilepton], leptonic decay [Z0], Particle Physics - Experiment, ATLAS, measured [channel cross section], Monte Carlo, Z0 --> tau+ tau-, 2 [higher-order], Hadron Colliders, QC, 530, Physical Sciences, QCD, 7000 GeV-cms, High Energy Physics - Experiment, Settore FIS/04 - Fisica Nucleare e Subnucleare, CERN LHC Coll, p p --> top anti-top anything, missing-energy [transverse momentum], high [transverse momentum], pp collisions; ATLAS detector, Nuclear and High Energy Physics; Collider Physics; LHC, 1 [higher-order], Nuclear and High Energy Physics, pair production [tau], experimental results, pair production [W], p p --> Z0 anything, LHC, distribution function [parton], Parton Distributions, pair production [top], Fysik, Science & Technology, Física, Settore FIS/01 - Fisica Sperimentale, p p --> W+ W- anything, multiplicity [jet]
ddc: ddc:530
Simultaneous measurements of the $t\bar{t}$, $W^+W^-$, and $Z/\gamma^{*}\rightarrow\tau\tau$ production cross-sections using an integrated luminosity of 4.6 fb$^{-1}$ of $pp$ collisions at $\sqrt{s} = 7$ TeV collected by the ATLAS detector at the LHC are presented. Events are selected with two high transverse momentum leptons consisting of an oppositely charged electron and muon pair. The three processes are separated using the distributions of the missing transverse momentum of events with zero and greater than zero jet multiplicities. Measurements of the fiducial cross-section are presented along with results that quantify for the first time the underlying correlations in the predicted and measured cross-sections due to proton parton distribution functions. These results indicate that the correlated NLO predictions for $t\bar{t}$ and $Z/\gamma^{*}\rightarrow\tau\tau$ significantly underestimate the data, while those at NNLO generally describe the data well. The full cross-sections are measured to be $\sigma(t\bar{t}) = 181.2 \pm 2.8^{+9.7}_{-9.5} \pm 3.3 \pm 3.3 $ pb, $\sigma(W^+W^-) = 53.3 \pm 2.7^{+7.3}_{-8.0} \pm 1.0 \pm 0.5$ pb, and $\sigma(Z/\gamma^{*}\rightarrow\tau\tau) = 1174 \pm 24^{+72}_{-87} \pm 21 \pm 9$ pb, where the cited uncertainties are due to statistics, systematic effects, luminosity and the LHC beam energy measurement, respectively.

Simultaneous measurements of the tt¯, W+W-, and Z/γ*ττ production cross-sections using an integrated luminosity of 4.6fb-1 of pp collisions at s=7TeV collected by the ATLAS detector at the LHC are presented. Events are selected with two high transverse momentum leptons consisting of an oppositely charged electron and muon pair. The three processes are separated using the distributions of the missing transverse momentum of events with zero and greater than zero jet multiplicities. Measurements of the fiducial cross-section are presented along with results that quantify for the first time the underlying correlations in the predicted and measured cross-sections due to proton parton distribution functions. These results indicate that the correlated next-to-leading-order predictions for tt¯ and Z/γ*ττ underestimate the data, while those at next-to-next-to-leading-order generally describe the data well. The full cross-sections are measured to be σ(tt¯)=181.2±2.8-9.5+9.7±3.3±3.3pb, σ(W+W-)=53.3±2.7-8.0+7.3±1.0±0.5pb, and σ(Z/γ*ττ)=1174±24-87+72±21±9pb, where the cited uncertainties are due to statistics, systematic effects, luminosity and the LHC beam energy measurement, respectively. The W+W- measurement includes the small contribution from Higgs boson decays, HW+W-.

Simultaneous measurements of the $t\bar{t}$, $W^+W^-$, and $Z/\gamma^{*}\rightarrow\tau\tau$ production cross-sections using an integrated luminosity of $4.6\,\mathrm{fb}^{-1}$ of $pp$ collisions at $\sqrt{s} = 7\,\mathrm{TeV}$ collected by the ATLAS detector at the LHC are presented. Events are selected with two high transverse momentum leptons consisting of an oppositely charged electron and muon pair. The three processes are separated using the distributions of the missing transverse momentum of events with zero and greater than zero jet multiplicities. Measurements of the fiducial cross-section are presented along with results that quantify for the first time the underlying correlations in the predicted and measured cross-sections due to proton parton distribution functions. These results indicate that the correlated NLO predictions for $t\bar{t}$ and $Z/\gamma^{*}\rightarrow\tau\tau$ underestimate the data, while those at NNLO generally describe the data well. The full cross-sections are measured to be $\sigma(t\bar{t}) = 181.2 \pm 2.8^{+9.7}_{-9.5} \pm 3.3 \pm 3.3\,\mathrm{pb}$, $\sigma(W^+W^-) = 53.3 \pm 2.7^{+7.3}_{-8.0} \pm 1.0 \pm 0.5\,\mathrm{pb}$, and $\sigma(Z/\gamma^{*}\rightarrow\tau\tau) = 1174 \pm 24^{+72}_{-87} \pm 21 \pm 9\,\mathrm{pb}$, where the cited uncertainties are due to statistics, systematic effects, luminosity and the LHC beam energy measurement, respectively. The $W^+W^-$ measurement includes the small contribution from Higgs boson decays, $H\rightarrow W^+W^-$.

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