Simultaneous measurements of the tt ¯, W + W −, and Z/γ ∗ →ττ production cross-sections in pp collisions at √s=7 TeV with the ATLAS detector

ATLAS, Collaboration; Agustoni, Marco; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Gallo, Valentina; Haug, Sigve; Kabana, Sonja; Kruker, Tobias; Marti, Lukas; Meloni, Federico; Pretzl, Klaus-Peter; Schneider, Basil; Sciacca, Gianfranco; Stramaglia, Maria Elena; Stucci, Stefania; Weber, Michael (2015). Simultaneous measurements of the tt ¯, W + W −, and Z/γ ∗ →ττ production cross-sections in pp collisions at √s=7 TeV with the ATLAS detector. Physical review. D - particles, fields, gravitation, and cosmology, 91(5) American Physical Society 10.1103/PhysRevD.91.052005

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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=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 tt ¯ and Z/γ ∗ →ττ underestimate the data, while those at NNLO generally describe the data well. The full cross-sections are measured to be σ(tt ¯ )=181.2±2.8 +9.7 −9.5 ±3.3±3.3pb , σ(W + W − )=53.3±2.7 +7.3 −8.0 ±1.0±0.5pb , and σ(Z/γ ∗ →ττ)=1174±24 +72 −87 ±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, H→W + W − .

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Agustoni, Marco; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Gallo, Valentina; Haug, Sigve; Kruker, Tobias; Marti, Lukas; Meloni, Federico; Pretzl, Klaus-Peter; Schneider, Basil; Sciacca, Gianfranco; Stramaglia, Maria Elena; Stucci, Stefania and Weber, Michael

Subjects:

500 Science > 530 Physics

ISSN:

1550-7998

Publisher:

American Physical Society

Language:

English

Submitter:

Annette Krebs-Wegenast

Date Deposited:

12 Sep 2016 13:45

Last Modified:

12 Feb 2017 02:09

Publisher DOI:

10.1103/PhysRevD.91.052005

ArXiv ID:

1407.0573

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt.

BORIS DOI:

10.7892/boris.87698

URI:

https://boris.unibe.ch/id/eprint/87698

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