A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at sqrt(s) = 7 TeV

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

doi:10.1007/JHEP09(2012)139

A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at sqrt(s) = 7 TeV

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

20 Citationer (Scopus)

Abstract

A search for flavour changing neutral current (FCNC) processes in top-quark decays by the ATLAS Collaboration is presented. Data collected from pp collisions at the LHC at a centre-of-mass energy of √s = 7 TeV during 2011, corresponding to an integrated luminosity of 2.1 fb^-1, were used. A search was performed for top-quark pair-production events, with one top quark decaying through the t → Zq FCNC (q = u, c) channel, and the other through the Standard Model dominant mode t → Wb. Only the decays of the Z boson to charged leptons and leptonic W-boson decays were considered as signal. Consequently, the final-state topology is characterised by the presence of three isolated charged leptons, at least two jets and missing transverse momentum from the undetected neutrino. No evidence for an FCNC signal was found. An upper limit on the t → Zq branching ratio of BR(t → Zq) < 0.73% is set at the 95% confidence level. Copyright CERN.

Originalsprog	Engelsk
Tidsskrift	Journal of High Energy Physics (Online)
Vol/bind	2012
Sider (fra-til)	139
ISSN	1126-6708
DOI	https://doi.org/10.1007/JHEP09(2012)139
Status	Udgivet - 12 sep. 2012

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10.1007/JHEP09(2012)139

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Aad, G., Dam, M., Hansen, J. B., Hansen, P. H., Hansen, J. D., Hansen, J. R., Klinkby, E. B., Heisterkamp, S. J. F., Jørgensen, M. D., Petersen, T. C., Nilsson, B. S., Mehlhase, S., Boelaert, N. M. P., Løvschall-Jensen, A. E., & Xella, S. (2012). A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at sqrt(s) = 7 TeV. Journal of High Energy Physics (Online), 2012, 139. https://doi.org/10.1007/JHEP09(2012)139

Aad, G, Dam, M , Hansen, JB , Hansen, PH , Hansen, JD , Hansen, JR, Klinkby, EB, Heisterkamp, SJF, Jørgensen, MD, Petersen, TC, Nilsson, BS, Mehlhase, S, Boelaert, NMP, Løvschall-Jensen, AE & Xella, S 2012, 'A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at sqrt(s) = 7 TeV', Journal of High Energy Physics (Online), bind 2012, s. 139. https://doi.org/10.1007/JHEP09(2012)139

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title = "A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at sqrt(s) = 7 TeV",

abstract = "A search for flavour changing neutral current (FCNC) processes in top-quark decays by the ATLAS Collaboration is presented. Data collected from pp collisions at the LHC at a centre-of-mass energy of √s = 7 TeV during 2011, corresponding to an integrated luminosity of 2.1 fb-1, were used. A search was performed for top-quark pair-production events, with one top quark decaying through the t → Zq FCNC (q = u, c) channel, and the other through the Standard Model dominant mode t → Wb. Only the decays of the Z boson to charged leptons and leptonic W-boson decays were considered as signal. Consequently, the final-state topology is characterised by the presence of three isolated charged leptons, at least two jets and missing transverse momentum from the undetected neutrino. No evidence for an FCNC signal was found. An upper limit on the t → Zq branching ratio of BR(t → Zq) < 0.73% is set at the 95% confidence level. Copyright CERN.",

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

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doi = "10.1007/JHEP09(2012)139",

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T1 - A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at sqrt(s) = 7 TeV

AU - Aad, G.

AU - Dam, Mogens

AU - Hansen, Jørgen Beck

AU - Hansen, Peter Henrik

AU - Hansen, Jørn Dines

AU - Hansen, John Renner

AU - Klinkby, Esben Bryndt

AU - Heisterkamp, Simon Johann Franz

AU - Jørgensen, Morten Dam

AU - Petersen, Troels Christian

AU - Nilsson, Björn Stefan

AU - Mehlhase, Sascha

AU - Boelaert, Nele Maria Philomena

AU - Løvschall-Jensen, Ask Emil

AU - Xella, Stefania

PY - 2012/9/12

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N2 - A search for flavour changing neutral current (FCNC) processes in top-quark decays by the ATLAS Collaboration is presented. Data collected from pp collisions at the LHC at a centre-of-mass energy of √s = 7 TeV during 2011, corresponding to an integrated luminosity of 2.1 fb-1, were used. A search was performed for top-quark pair-production events, with one top quark decaying through the t → Zq FCNC (q = u, c) channel, and the other through the Standard Model dominant mode t → Wb. Only the decays of the Z boson to charged leptons and leptonic W-boson decays were considered as signal. Consequently, the final-state topology is characterised by the presence of three isolated charged leptons, at least two jets and missing transverse momentum from the undetected neutrino. No evidence for an FCNC signal was found. An upper limit on the t → Zq branching ratio of BR(t → Zq) < 0.73% is set at the 95% confidence level. Copyright CERN.

AB - A search for flavour changing neutral current (FCNC) processes in top-quark decays by the ATLAS Collaboration is presented. Data collected from pp collisions at the LHC at a centre-of-mass energy of √s = 7 TeV during 2011, corresponding to an integrated luminosity of 2.1 fb-1, were used. A search was performed for top-quark pair-production events, with one top quark decaying through the t → Zq FCNC (q = u, c) channel, and the other through the Standard Model dominant mode t → Wb. Only the decays of the Z boson to charged leptons and leptonic W-boson decays were considered as signal. Consequently, the final-state topology is characterised by the presence of three isolated charged leptons, at least two jets and missing transverse momentum from the undetected neutrino. No evidence for an FCNC signal was found. An upper limit on the t → Zq branching ratio of BR(t → Zq) < 0.73% is set at the 95% confidence level. Copyright CERN.

U2 - 10.1007/JHEP09(2012)139

DO - 10.1007/JHEP09(2012)139

M3 - Journal article

SN - 1126-6708

VL - 2012

SP - 139

JO - Journal of High Energy Physics (Online)

JF - Journal of High Energy Physics (Online)

ER -

A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at sqrt(s) = 7 TeV

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