Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (2016). Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector. European physical journal. C - particles and fields, 76(2) EDP Sciences 10.1140/epjc/s10052-016-3876-4
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1509.00294.pdf - Accepted Version Available under License Creative Commons: Attribution (CC-BY). Download (1MB) | Preview |
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10.1140_epjc_s10052-016-3876-4.pdf - Published Version Available under License Creative Commons: Attribution (CC-BY). Download (5MB) | Preview |
A search for single top-quark production via flavour changing neutral current processes from gluon plus up- or charm--quark initial states in proton--proton collisions at the LHC is presented. Data collected with the ATLAS detector in 2012 at a centre-of-mass energy of 8TeV and corresponding to an integrated luminosity of 20.3fb⁻¹ are used. Candidate events for a top quark decaying into a lepton, a neutrino and a jet are selected and classified into signal- and background-like candidates using a neural network. No signal is observed and an upper limit on the production cross-section multiplied by the t→Wb branching fraction is set. The observed 95% CL limit is σ qg→t ×B(t→Wb)<3.4pb and the expected 95% CL limit is σ qg→t ×B(t→Wb)<2.9pb. The observed limit can be interpreted as upper limits on the coupling constants of the flavour changing neutral current interactions divided by the scale of new physics κugt /Λ < 5.8×10 −3 TeV −1 and κ cgt /Λ<13×10⁻³ TeV⁻¹ and on the branching fractions B(t→ug)<4×10⁻⁵ and B(t→cg)<20×10⁻⁵.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP) |
UniBE Contributor: |
Haug, Sigve, Weber, Michele, Beck, Hans Peter |
Subjects: |
500 Science > 530 Physics 500 Science > 510 Mathematics |
ISSN: |
1434-6044 |
Publisher: |
EDP Sciences |
Language: |
English |
Submitter: |
Annette Krebs-Wegenast |
Date Deposited: |
16 Aug 2017 12:47 |
Last Modified: |
05 Dec 2022 15:05 |
Publisher DOI: |
10.1140/epjc/s10052-016-3876-4 |
Additional Information: |
Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt. |
BORIS DOI: |
10.7892/boris.100022 |
URI: |
https://boris.unibe.ch/id/eprint/100022 |
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