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...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_03702693_v712_n4-5_p351_Aad |
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todo:paper_03702693_v712_n4-5_p351_Aad2023-10-03T15:29:19Z Search for FCNC single top-quark production at √s=7 TeV with the ATLAS detector Aad, G. FCNC Heavy-quark production Single top quark Top physics 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 σ qg→t ×B(t→Wb)<3.9 pb. This upper limit is converted using a model-independent approach into upper limits on the coupling strengths κ ugt /Λ<6.9⋅10 −3 TeV −1 and κ cgt /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 . © 2012 CERN JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03702693_v712_n4-5_p351_Aad |
| institution |
Universidad de Buenos Aires |
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I-28 |
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R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
FCNC Heavy-quark production Single top quark Top physics |
| spellingShingle |
FCNC Heavy-quark production Single top quark Top physics Aad, G. Search for FCNC single top-quark production at √s=7 TeV with the ATLAS detector |
| topic_facet |
FCNC Heavy-quark production Single top quark Top physics |
| description |
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 σ qg→t ×B(t→Wb)<3.9 pb. This upper limit is converted using a model-independent approach into upper limits on the coupling strengths κ ugt /Λ<6.9⋅10 −3 TeV −1 and κ cgt /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 . © 2012 CERN |
| format |
JOUR |
| author |
Aad, G. |
| author_facet |
Aad, G. |
| author_sort |
Aad, G. |
| title |
Search for FCNC single top-quark production at √s=7 TeV with the ATLAS detector |
| title_short |
Search for FCNC single top-quark production at √s=7 TeV with the ATLAS detector |
| title_full |
Search for FCNC single top-quark production at √s=7 TeV with the ATLAS detector |
| title_fullStr |
Search for FCNC single top-quark production at √s=7 TeV with the ATLAS detector |
| title_full_unstemmed |
Search for FCNC single top-quark production at √s=7 TeV with the ATLAS detector |
| title_sort |
search for fcnc single top-quark production at √s=7 tev with the atlas detector |
| url |
http://hdl.handle.net/20.500.12110/paper_03702693_v712_n4-5_p351_Aad |
| work_keys_str_mv |
AT aadg searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector |
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1807321418821533696 |