Search for FCNC single top-quark production at √s=7 TeV with the ATLAS detector*

A search for the production of single top-quarks via flavour-changing neutral-currents is presented. Data collected with the ATLAS detector at a centre-of-mass energy of s=7 TeV, corresponding to an integrated luminosity of 2.05 fb−1, are used. Candidate events with a semileptonic top-quark decay si...

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Hauptverfasser: Aad, Georges (VerfasserIn) , Anders, Christoph (VerfasserIn) , Anders, Gabriel (VerfasserIn) , Andrei, George Victor (VerfasserIn) , Davygora, Yuriy (VerfasserIn) , Dietzsch, Thorsten (VerfasserIn) , Geweniger, Christoph (VerfasserIn) , Hanke, Paul (VerfasserIn) , Henke, Michael (VerfasserIn) , Kasieczka, Gregor (VerfasserIn) , Khomich, Andrei (VerfasserIn) , Kluge, Eike-Erik (VerfasserIn) , Kugel, Andreas (VerfasserIn) , Lendermann, Victor (VerfasserIn) , Männer, Reinhard (VerfasserIn) , Meier, Karlheinz (VerfasserIn) , Müller, Felix (VerfasserIn) , Narayan, Rohin T. (VerfasserIn) , Poddar, Sahill (VerfasserIn) , Schätzel, Sebastian (VerfasserIn) , Scharf, Veit (VerfasserIn) , Schmitt, Sebastian (VerfasserIn) , Schöning, André (VerfasserIn) , Schroer, Nicolai (VerfasserIn) , Schultz-Coulon, Hans-Christian (VerfasserIn) , Stamen, Rainer (VerfasserIn) , Wessels, Martin (VerfasserIn)
Körperschaft: ATLAS Collaboration (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 12 June 2012
In: Physics letters
Year: 2012, Jahrgang: 712, Heft: 4, Pages: 351-369
ISSN:1873-2445
DOI:10.1016/j.physletb.2012.05.022
Online-Zugang:Verlag, Volltext: http://dx.doi.org/10.1016/j.physletb.2012.05.022
Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0370269312005394
Volltext
Verfasserangaben:ATLAS Collaboration*
Beschreibung
Zusammenfassung:A search for the production of single top-quarks via flavour-changing neutral-currents is presented. Data collected with the ATLAS detector at a centre-of-mass energy of s=7 TeV, corresponding to an integrated luminosity of 2.05 fb−1, are used. Candidate events with a semileptonic top-quark decay signature are classified as signal- or background-like events by using several kinematic variables as input to a neural network. No signal is observed in the neural network output distribution and a Bayesian upper limit is placed on the production cross-section. The observed upper limit at 95% confidence level on the cross-section multiplied by the t→Wb branching fraction is measured to be σqg→t×B(t→Wb)<3.9 pb. This upper limit is converted using a model-independent approach into upper limits on the coupling strengths κugt/Λ<6.9⋅10−3 TeV−1 and κcgt/Λ<1.6⋅10−2 TeV−1, where Λ is the new physics scale, and on the branching fractions B(t→ug)<5.7⋅10−5 and B(t→cg)<2.7⋅10−4.
Beschreibung:ATLAS Collaboration: G. Aad, G. Anders, V. Andrei, Y. Davygora, T.A. Dietzsch, C. Geweniger, P. Hanke, M. Henke, G. Kasieczka, A. Khomich, E.-E. Kluge, A. Kugel, V. Lendermann, R. Maenner, K. Meier, F. Müller, R. Narayan, S. Poddar, S. Schaetzel, V. Scharf, S. Schmitt, A. Schöning, N. Schroer, H.-C. Schultz-Coulon, R. Stamen, M. Wessels [und weitere]
Gesehen am 30.11.2018
Beschreibung:Online Resource
ISSN:1873-2445
DOI:10.1016/j.physletb.2012.05.022