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Aad, G.; Brenner, Richard; Buszello, Claus P.; Ekelöf, Tord; Ellert, Mattias; Ferrari, Arnaud; Isaksson, Charlie; Madsen, Alexander; Öhman, Henrik; Pelikan, Daniel; Rangel-Smith, Camilla; Zwalinski, L. (2015)
Publisher: Uppsala universitet, Högenergifysik
Languages: English
Types: Article
tau+ tau-, 2 [higher-order], QC, Hadron Colliders, 530, QCD, Physical Sciences, 7000 GeV-cms, Settore FIS/04 - Fisica Nucleare e Subnucleare, High Energy Physics - Experiment, 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, Nuclear and High Energy Physics, 1 [higher-order], pair production [tau], Experimental results, pair production [W], p p --> Z0 anything, LHC, distribution function [parton], Parton Distributions, pair production [top], Física, Science & Technology, Fysik, Settore FIS/01 - Fisica Sperimentale, p p --> W+ W- anything, multiplicity [jet]--> Subjects: scattering [p p], final state [dilepton], leptonic decay [Z0], ATLAS, measured [channel cross section], Monte Carlo, Z0 --> tau+ tau-, 2 [higher-order], QC, Hadron Colliders, 530, QCD, Physical Sciences, 7000 GeV-cms, Settore FIS/04 - Fisica Nucleare e Subnucleare, High Energy Physics - Experiment, 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, Nuclear and High Energy Physics, 1 [higher-order], pair production [tau], Experimental results, pair production [W], p p --> Z0 anything, LHC, distribution function [parton], Parton Distributions, pair production [top], Física, Science & Technology, Fysik, Settore FIS/01 - Fisica Sperimentale, p p --> W+ W- anything, multiplicity [jet]
ddc: ddc:530
Artículo escrito por muchos autores, sólo se referencian el primero, los autores que firman como Universidad Autónoma de Madrid y el grupo de colaboración en el caso de que aparezca en el artículo Simultaneous measurements of the tt¯, W+W-, and Z/γ∗→ττ production cross-sections using an integrated luminosity of 4.6 fb-1 of pp collisions at √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 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±3.3 pb, σ(W+W-)=53.3±2.7-8.0+7.3±1.0±0.5 pb, and σ(Z/γ∗→ττ)=1174±24-87+72±21±9 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→W+W- We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWF and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF, DNSRC and Lundbeck Foundation, Denmark; EPLANET, ERC and NSRF, European Union; IN2P3-CNRS, CEA-DSM/IRFU, France; GNSF, Georgia; BMBF, DFG, HGF, MPG and AvH Foundation, Germany; GSRT and NSRF, Greece; ISF, MINERVA, GIF, I-CORE and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; BRF and RCN, Norway; MNiSW and NCN, Poland; GRICES and FCT, Portugal; MNE/IFA, Romania; MES of Russia and ROSATOM, Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; ARRS and MIZŠ, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg Foundation, Sweden; SER, SNSF and Cantons of Bern and Geneva, Switzerland; NSC, Taiwan; TAEK, Turkey; STFC, the Royal Society and Leverhulme Trust, United Kingdom; DOE and NSF, USA. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN and the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA) and in the Tier-2 facilities worldwide
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