A search for ttbar resonances with the ATLAS detector in 2.05 fb^-1 of proton-proton collisions at sqrt(s) = 7 TeV

G. Aad; Mogens Dam; Jørgen Beck Hansen; Jørn Dines Hansen; Peter Henrik Hansen; John Renner Hansen; Simon Johann Franz Heisterkamp; Sascha Mehlhase; Nele Maria Philomena Boelaert; Esben Bryndt Klinkby; Morten Dam Jørgensen; Troels Christian Petersen; Björn Stefan Nilsson; Ask Emil Løvschall-Jensen; Stefania Xella

doi:10.1140/epjc/s10052-012-2083-1

A search for ttbar resonances with the ATLAS detector in 2.05 fb^-1 of proton-proton collisions at sqrt(s) = 7 TeV

G. Aad, Mogens Dam, Jørgen Beck Hansen, Jørn Dines Hansen, Peter Henrik Hansen, John Renner Hansen, Simon Johann Franz Heisterkamp, Sascha Mehlhase, Nele Maria Philomena Boelaert, Esben Bryndt Klinkby, Morten Dam Jørgensen, Troels Christian Petersen, Björn Stefan Nilsson, Ask Emil Løvschall-Jensen, Stefania Xella

23 Citations (Scopus)

Abstract

A search for top quark pair resonances in final states containing at least one electron or muon has been performed with the ATLAS experiment at the CERN Large Hadron Collider. The search uses a data sample corresponding to an integrated luminosity of 2.05 fb⁻¹, which was recorded in 2011 at a proton-proton centre-of-mass energy of 7 TeV. No evidence for a resonance is found and limits are set on the production cross-section times branching ratio to tt for narrow and wide resonances. For narrow Z′ bosons, the observed 95 % Bayesian credibility level limits range from 9.3 pb to 0.95 pb for masses in the range of m_Z′ = 500 GeV to m_{Z ′}= 1300 GeV. The corresponding excluded mass region for a leptophobic topcolour Z′ boson (Kaluza-Klein gluon excitation in the Randall-Sundrum model) is m_Z < 880 GeV (m_gKK < 1130 GeV).

Original language	English
Journal	European Physical Journal C
Volume	72
Pages (from-to)	2083
ISSN	1434-6044
DOIs	https://doi.org/10.1140/epjc/s10052-012-2083-1
Publication status	Published - 26 Jul 2012

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Aad, G., Dam, M., Hansen, J. B., Hansen, J. D., Hansen, P. H., Hansen, J. R., Heisterkamp, S. J. F., Mehlhase, S., Boelaert, N. M. P., Klinkby, E. B., Jørgensen, M. D., Petersen, T. C., Nilsson, B. S., Løvschall-Jensen, A. E., & Xella, S. (2012). A search for ttbar resonances with the ATLAS detector in 2.05 fb^-1 of proton-proton collisions at sqrt(s) = 7 TeV. European Physical Journal C, 72, 2083. https://doi.org/10.1140/epjc/s10052-012-2083-1

Aad, G, Dam, M , Hansen, JB , Hansen, JD , Hansen, PH , Hansen, JR, Heisterkamp, SJF, Mehlhase, S, Boelaert, NMP, Klinkby, EB, Jørgensen, MD, Petersen, TC, Nilsson, BS, Løvschall-Jensen, AE & Xella, S 2012, 'A search for ttbar resonances with the ATLAS detector in 2.05 fb^-1 of proton-proton collisions at sqrt(s) = 7 TeV', European Physical Journal C, vol. 72, pp. 2083. https://doi.org/10.1140/epjc/s10052-012-2083-1

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title = "A search for ttbar resonances with the ATLAS detector in 2.05 fb^-1 of proton-proton collisions at sqrt(s) = 7 TeV",

abstract = "A search for top quark pair resonances in final states containing at least one electron or muon has been performed with the ATLAS experiment at the CERN Large Hadron Collider. The search uses a data sample corresponding to an integrated luminosity of 2.05 fb−1, which was recorded in 2011 at a proton-proton centre-of-mass energy of 7 TeV. No evidence for a resonance is found and limits are set on the production cross-section times branching ratio to tt for narrow and wide resonances. For narrow Z′ bosons, the observed 95 % Bayesian credibility level limits range from 9.3 pb to 0.95 pb for masses in the range of mZ′ = 500 GeV to mZ ′= 1300 GeV. The corresponding excluded mass region for a leptophobic topcolour Z′ boson (Kaluza-Klein gluon excitation in the Randall-Sundrum model) is mZ < 880 GeV (mgKK < 1130 GeV).",

author = "G. Aad and Mogens Dam and Hansen, {J{\o}rgen Beck} and Hansen, {J{\o}rn Dines} and Hansen, {Peter Henrik} and Hansen, {John Renner} and Heisterkamp, {Simon Johann Franz} and Sascha Mehlhase and Boelaert, {Nele Maria Philomena} and Klinkby, {Esben Bryndt} and J{\o}rgensen, {Morten Dam} and Petersen, {Troels Christian} and Nilsson, {Bj{\"o}rn Stefan} and L{\o}vschall-Jensen, {Ask Emil} and Stefania Xella",

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doi = "10.1140/epjc/s10052-012-2083-1",

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T1 - A search for ttbar resonances with the ATLAS detector in 2.05 fb^-1 of proton-proton collisions at sqrt(s) = 7 TeV

AU - Aad, G.

AU - Dam, Mogens

AU - Hansen, Jørgen Beck

AU - Hansen, Jørn Dines

AU - Hansen, Peter Henrik

AU - Hansen, John Renner

AU - Heisterkamp, Simon Johann Franz

AU - Mehlhase, Sascha

AU - Boelaert, Nele Maria Philomena

AU - Klinkby, Esben Bryndt

AU - Jørgensen, Morten Dam

AU - Petersen, Troels Christian

AU - Nilsson, Björn Stefan

AU - Løvschall-Jensen, Ask Emil

AU - Xella, Stefania

PY - 2012/7/26

Y1 - 2012/7/26

N2 - A search for top quark pair resonances in final states containing at least one electron or muon has been performed with the ATLAS experiment at the CERN Large Hadron Collider. The search uses a data sample corresponding to an integrated luminosity of 2.05 fb−1, which was recorded in 2011 at a proton-proton centre-of-mass energy of 7 TeV. No evidence for a resonance is found and limits are set on the production cross-section times branching ratio to tt for narrow and wide resonances. For narrow Z′ bosons, the observed 95 % Bayesian credibility level limits range from 9.3 pb to 0.95 pb for masses in the range of mZ′ = 500 GeV to mZ ′= 1300 GeV. The corresponding excluded mass region for a leptophobic topcolour Z′ boson (Kaluza-Klein gluon excitation in the Randall-Sundrum model) is mZ < 880 GeV (mgKK < 1130 GeV).

AB - A search for top quark pair resonances in final states containing at least one electron or muon has been performed with the ATLAS experiment at the CERN Large Hadron Collider. The search uses a data sample corresponding to an integrated luminosity of 2.05 fb−1, which was recorded in 2011 at a proton-proton centre-of-mass energy of 7 TeV. No evidence for a resonance is found and limits are set on the production cross-section times branching ratio to tt for narrow and wide resonances. For narrow Z′ bosons, the observed 95 % Bayesian credibility level limits range from 9.3 pb to 0.95 pb for masses in the range of mZ′ = 500 GeV to mZ ′= 1300 GeV. The corresponding excluded mass region for a leptophobic topcolour Z′ boson (Kaluza-Klein gluon excitation in the Randall-Sundrum model) is mZ < 880 GeV (mgKK < 1130 GeV).

U2 - 10.1140/epjc/s10052-012-2083-1

DO - 10.1140/epjc/s10052-012-2083-1

M3 - Journal article

SN - 1434-6044

VL - 72

SP - 2083

JO - The European Physical Journal C: Particles and Fields

JF - The European Physical Journal C: Particles and Fields

ER -

A search for ttbar resonances with the ATLAS detector in 2.05 fb^-1 of proton-proton collisions at sqrt(s) = 7 TeV

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