Simultaneous measurements of the , , and production cross-sections in collisions at with the ATLAS detector
Simultaneous measurements of the t$$\bar{t}$$, 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. The results indicate that the correlated next-to-leading-order predictions for t$$\bar{t}$$ 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(t$$\bar{t}$$)=181.2 ± 2.8$$+9.7\atop{–9.5}$$ ± 3.3 ± 3.3 pb, σ(W+W–) = 53.3 ± 2.7$$+7.3\atop{–8.0}$$ ± 1.0 ± 0.5 pb, and σ(Z/γ*→ττ) = 1174 ± 24$$+72\atop{–87}$$ ± 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–.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- ATLAS Collaboration
- Grant/Contract Number:
- AC02-06CH11357; AC02-05CH11231; SC00112704; AC03-76SF00515
- OSTI ID:
- 1181293
- Alternate ID(s):
- OSTI ID: 1224553; OSTI ID: 1224689; OSTI ID: 1407332
- Journal Information:
- Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 91, Issue 5; ISSN 1550-7998
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Top-quark physics at the Large Hadron Collider
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journal | May 2017 |
Measurements of the $$\mathrm{t}\overline{\mathrm{t}}$$ t t ¯ production cross section in lepton+jets final states in pp collisions at 8 $$\,\text {TeV}$$ TeV and ratio of 8 to 7 $$\,\text {TeV}$$ TeV cross sections
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journal | January 2017 |
Top-quark physics at the Large Hadron Collider | text | January 2016 |
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