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

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dc.contributor.authorAad, G
dc.contributor.authorAbbott, B
dc.contributor.authorAbdallah, J
dc.contributor.authorAbdelalim, A A
dc.contributor.authorAbdesselam, A
dc.contributor.authorAbdinov, O
dc.contributor.authorAbi, B
dc.contributor.authorAbolins, M
dc.contributor.authorAbouZeid, O S
dc.contributor.authorAbramowicz, H
dc.contributor.authorAbreu, H
dc.contributor.authorAcerbi, E
dc.contributor.authorAcharya, B S
dc.contributor.authorAdamczyk, L
dc.contributor.authorAdams, D L
dc.contributor.authorAddy, T N
dc.contributor.authorAdelman, J
dc.contributor.authorAderholz, M
dc.contributor.authorAdomeit, S
dc.contributor.authorAdragna, P
dc.contributor.authorAdye, T
dc.contributor.authorAefsky, S
dc.contributor.authorAguilar-Saavedra, J A
dc.contributor.authorAharrouche, M
dc.contributor.authorAhlen, S P
dc.contributor.authorAhles, F
dc.contributor.authorAhmad, A
dc.contributor.authorAhsan, M
dc.contributor.authorAielli, G
dc.contributor.authorAkdogan, T
dc.contributor.authorÅkesson, T P A
dc.contributor.authorAkimoto, G
dc.date.accessioned2021-10-08T07:11:41Z
dc.date.available2021-10-08T07:11:41Z
dc.date.issued2012
dc.description.abstractA 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 View the MathML sources=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→Wbt→Wb branching fraction is measured to be σqg→t×B(t→Wb)<3.9 pbσqg→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−1κugt/Λ<6.9⋅10−3 TeV−1 and κcgt/Λ<1.6⋅10−2 TeV−1κcgt/Λ<1.6⋅10−2 TeV−1, where Λ is the new physics scale, and on the branching fractions B(t→ug)<5.7⋅10−5B(t→ug)<5.7⋅10−5 and B(t→cg)<2.7⋅10−4B(t→cg)<2.7⋅10−4.
dc.identifier.apacitationAad, G., Abbott, B., Abdallah, J., Abdelalim, A. A., Abdesselam, A., Abdinov, O., ... Akimoto, G. (2012). Search for FCNC single top-quark production at √s = 7 TeV with the ATLAS detector. <i>Physics Letters, B</i>, 712(43195), 351 - 369. http://hdl.handle.net/11427/34668en_ZA
dc.identifier.chicagocitationAad, G, B Abbott, J Abdallah, A A Abdelalim, A Abdesselam, O Abdinov, B Abi, et al "Search for FCNC single top-quark production at √s = 7 TeV with the ATLAS detector." <i>Physics Letters, B</i> 712, 43195. (2012): 351 - 369. http://hdl.handle.net/11427/34668en_ZA
dc.identifier.citationAad, G., Abbott, B., Abdallah, J., Abdelalim, A.A., Abdesselam, A., Abdinov, O., Abi, B. & Abolins, M. et al. 2012. Search for FCNC single top-quark production at √s = 7 TeV with the ATLAS detector. <i>Physics Letters, B.</i> 712(43195):351 - 369. http://hdl.handle.net/11427/34668en_ZA
dc.identifier.issn0370-2693
dc.identifier.issn1873-2445
dc.identifier.ris TY - Journal Article AU - Aad, G AU - Abbott, B AU - Abdallah, J AU - Abdelalim, A A AU - Abdesselam, A AU - Abdinov, O AU - Abi, B AU - Abolins, M AU - AbouZeid, O S AU - Abramowicz, H AU - Abreu, H AU - Acerbi, E AU - Acharya, B S AU - Adamczyk, L AU - Adams, D L AU - Addy, T N AU - Adelman, J AU - Aderholz, M AU - Adomeit, S AU - Adragna, P AU - Adye, T AU - Aefsky, S AU - Aguilar-Saavedra, J A AU - Aharrouche, M AU - Ahlen, S P AU - Ahles, F AU - Ahmad, A AU - Ahsan, M AU - Aielli, G AU - Akdogan, T AU - Åkesson, T P A AU - Akimoto, G AB - 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 View the MathML sources=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→Wbt→Wb branching fraction is measured to be σqg→t×B(t→Wb)<3.9 pbσqg→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−1κugt/Λ<6.9⋅10−3 TeV−1 and κcgt/Λ<1.6⋅10−2 TeV−1κcgt/Λ<1.6⋅10−2 TeV−1, where Λ is the new physics scale, and on the branching fractions B(t→ug)<5.7⋅10−5B(t→ug)<5.7⋅10−5 and B(t→cg)<2.7⋅10−4B(t→cg)<2.7⋅10−4. DA - 2012 DB - OpenUCT DP - University of Cape Town IS - 43195 J1 - Physics Letters, B LK - https://open.uct.ac.za PY - 2012 SM - 0370-2693 SM - 1873-2445 T1 - Search for FCNC single top-quark production at √s = 7 TeV with the ATLAS detector TI - Search for FCNC single top-quark production at √s = 7 TeV with the ATLAS detector UR - http://hdl.handle.net/11427/34668 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34668
dc.identifier.vancouvercitationAad G, Abbott B, Abdallah J, Abdelalim AA, Abdesselam A, Abdinov O, et al. Search for FCNC single top-quark production at √s = 7 TeV with the ATLAS detector. Physics Letters, B. 2012;712(43195):351 - 369. http://hdl.handle.net/11427/34668.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Physics
dc.publisher.facultyFaculty of Science
dc.sourcePhysics Letters, B
dc.source.journalissue43195
dc.source.journalvolume712
dc.source.pagination351 - 369
dc.source.urihttps://dx.doi.org/10.1016/j.physletb.2012.05.022
dc.subject.otherPhysical Sciences
dc.subject.otherFysik
dc.subject.otherNatural Sciences Physical Sciences
dc.subject.otherNaturvetenskap Fysik
dc.subject.otherTop physics
dc.subject.otherHeavy-quark production
dc.subject.otherFCNC
dc.subject.otherSingle top quark
dc.titleSearch for FCNC single top-quark production at √s = 7 TeV with the ATLAS detector
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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