Search for FCNC single top-quark production at $\sqrt{s}=7$ TeV with the ATLAS detector
(2012) Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 712, p. 351 (2012)
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- Abstract
- 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 .
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Tanasijczuk, A. J., ATLAS, & et al. (2012). Search for FCNC single top-quark production at $\sqrt{s}=7$ TeV with the ATLAS detector. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 712, 351. https://doi.org/10.1016/j.physletb.2012.05.022 (Original work published 2012)