Abstract
Measurements of the single top quark production cross-sections in proton collisions with the ATLAS detector at the Large Hadron Collider are presented. The single top-quark production in the t and Wt -channels and the determination of the CKM matrix element |Vtb | are discussed. A separate measurement of the top and antitop quark cross-sections and their ratio is shown. These measurements are sensitive to the parton distribution function in the proton. In addition, limits on exotic production in single top quark processes are outlined. This also includes the search for flavour-changing neutral currents and for additional W’ bosons in the s-channel.
Highlights
At the Large Hadron Collider (LHC) top quarks can be produced via strong and electroweak interactions
There are interesting questions coupled to single topquark production, which can be addressed by measurements accomplished using proton collision data from the ATLAS detector [2]
As no excess of signal has been observed in the distributions, a template fit has been used to extract a variety of limits for new physics models including an excited bottom quark
Summary
At the Large Hadron Collider (LHC) top quarks can be produced via strong and electroweak interactions. While strong interactions lead to top-quark pair production, single top quarks are produced in electroweak interactions accompanied by other particles. The Standard Model of particle physics predicts the generation of single top quarks in three channels that have di↵erent initial and final states: the t-channel, the associated production of a W boson and a top quark, referred to as Wt-channel, and the s-channel.
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