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 s...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
2012
|
| _version_ | 1797103948045221888 |
|---|---|
| author | Aad, G Abbott, B Abdallah, J Abdelalim, A Abdesselam, A Abdinov, O Abi, B Abolins, M AbouZeid, O Abramowicz, H Abreu, H Acerbi, E Acharya, B Adamczyk, L Adams, D Addy, T Adelman, J Aderholz, M Adomeit, S Adragna, P Adye, T Aefsky, S Aguilar-Saavedra, J Aharrouche, M Ahlen, S |
| author_facet | Aad, G Abbott, B Abdallah, J Abdelalim, A Abdesselam, A Abdinov, O Abi, B Abolins, M AbouZeid, O Abramowicz, H Abreu, H Acerbi, E Acharya, B Adamczyk, L Adams, D Addy, T Adelman, J Aderholz, M Adomeit, S Adragna, P Adye, T Aefsky, S Aguilar-Saavedra, J Aharrouche, M Ahlen, S |
| author_sort | Aad, G |
| collection | OXFORD |
| 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 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{dot operator}10-3 TeV-1 and κcgt/Λ<1.6{dot operator}10-2 TeV-1, where Λ is the new physics scale, and on the branching fractions B(t→ug)<5.7{dot operator}10-5 and B(t→cg)<2.7{dot operator}10-4. © 2012 CERN. |
| first_indexed | 2024-03-07T06:27:17Z |
| format | Journal article |
| id | oxford-uuid:f4bee9ff-8342-41d6-ac81-3bede9763225 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T06:27:17Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | oxford-uuid:f4bee9ff-8342-41d6-ac81-3bede97632252022-03-27T12:22:13ZSearch for FCNC single top-quark production at √s=7 TeV with the ATLAS detectorJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:f4bee9ff-8342-41d6-ac81-3bede9763225EnglishSymplectic Elements at Oxford2012Aad, GAbbott, BAbdallah, JAbdelalim, AAbdesselam, AAbdinov, OAbi, BAbolins, MAbouZeid, OAbramowicz, HAbreu, HAcerbi, EAcharya, BAdamczyk, LAdams, DAddy, TAdelman, JAderholz, MAdomeit, SAdragna, PAdye, TAefsky, SAguilar-Saavedra, JAharrouche, MAhlen, SA 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{dot operator}10-3 TeV-1 and κcgt/Λ<1.6{dot operator}10-2 TeV-1, where Λ is the new physics scale, and on the branching fractions B(t→ug)<5.7{dot operator}10-5 and B(t→cg)<2.7{dot operator}10-4. © 2012 CERN. |
| spellingShingle | Aad, G Abbott, B Abdallah, J Abdelalim, A Abdesselam, A Abdinov, O Abi, B Abolins, M AbouZeid, O Abramowicz, H Abreu, H Acerbi, E Acharya, B Adamczyk, L Adams, D Addy, T Adelman, J Aderholz, M Adomeit, S Adragna, P Adye, T Aefsky, S Aguilar-Saavedra, J Aharrouche, M Ahlen, S Search for FCNC single top-quark production at √s=7 TeV with the ATLAS detector |
| title | 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_short | 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 |
| work_keys_str_mv | AT aadg searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT abbottb searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT abdallahj searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT abdelalima searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT abdesselama searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT abdinovo searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT abib searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT abolinsm searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT abouzeido searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT abramowiczh searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT abreuh searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT acerbie searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT acharyab searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT adamczykl searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT adamsd searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT addyt searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT adelmanj searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT aderholzm searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT adomeits searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT adragnap searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT adyet searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT aefskys searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT aguilarsaavedraj searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT aharrouchem searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector AT ahlens searchforfcncsingletopquarkproductionats7tevwiththeatlasdetector |