Measurement of the tt¯Z and tt¯W cross sections in proton-proton collisions at √s=13  TeV with the ATLAS detector

ATLAS Collaboration; Paul Newman

doi:10.1103/PhysRevD.99.072009

Measurement of the tt¯Z and tt¯W cross sections in proton-proton collisions at √s=13 TeV with the ATLAS detector

ATLAS Collaboration, Paul Newman

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

35 Citations (Scopus)

195 Downloads (Pure)

Abstract

A measurement of the associated production of a top-quark pair (tt¯) with a vector boson (W, Z) in proton-proton collisions at a center-of-mass energy of 13 TeV is presented, using 36.1 fb⁻¹ of integrated luminosity collected by the ATLAS detector at the Large Hadron Collider. Events are selected in channels with two same- or opposite-sign leptons (electrons or muons), three leptons or four leptons, and each channel is further divided into multiple regions to maximize the sensitivity of the measurement. The tt¯Z and tt¯W production cross sections are simultaneously measured using a combined fit to all regions. The best-fit values of the production cross sections are σ_tt¯Z=0.95±0.08_stat±0.10_syst pb and σ_tt¯W=0.87±0.13_stat±0.14_syst pb in agreement with the Standard Model predictions. The measurement of the tt¯Z cross section is used to set constraints on effective field theory operators which modify the tt¯Z vertex.

Original language	English
Article number	072009
Number of pages	38
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	99
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevD.99.072009
Publication status	Published - 29 Apr 2019

Bibliographical note

56 pages in total, author list starting page 40, 14 figures, 11 tables, published in Phys. Rev. D 99 (2019) 072009. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2016-11

Keywords

hep-ex

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10.1103/PhysRevD.99.072009Licence: Creative Commons: Attribution (CC BY)

ATLAS_Collaboration_Measurement_of_the_tt¯Z_and_tt¯W_cross_sections_Physical_Review_D_2019
Checked for eligibility: 08/05/2019
Final published version, 1.05 MBLicence: Creative Commons: Attribution (CC BY)

Cite this

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title = "Measurement of the tt¯Z and tt¯W cross sections in proton-proton collisions at √s=13 TeV with the ATLAS detector",

abstract = "A measurement of the associated production of a top-quark pair (tt¯) with a vector boson (W, Z) in proton-proton collisions at a center-of-mass energy of 13 TeV is presented, using 36.1 fb−1 of integrated luminosity collected by the ATLAS detector at the Large Hadron Collider. Events are selected in channels with two same- or opposite-sign leptons (electrons or muons), three leptons or four leptons, and each channel is further divided into multiple regions to maximize the sensitivity of the measurement. The tt¯Z and tt¯W production cross sections are simultaneously measured using a combined fit to all regions. The best-fit values of the production cross sections are σtt¯Z=0.95±0.08stat±0.10syst pb and σtt¯W=0.87±0.13stat±0.14syst pb in agreement with the Standard Model predictions. The measurement of the tt¯Z cross section is used to set constraints on effective field theory operators which modify the tt¯Z vertex. ",

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