Abstract: New interactions at higher energies may manifest themselves in the form of effective couplings of SM fermions. In this context, top quark as the heaviest fermion of the Standard Model, plays an important role since it decays before hadronization. The quark information, like spin, is therefore not lost and is accessible in decay products. It decays almost all the time to a b-quark and a W-boson and provides an interesting area to study the Wtb vertex in search for new interactions. Wtb vertex is involved also in the production of top quark (single-top), giving another place to investigate the anomalous couplings. The Large Hadron Collider is a top quark factory. Hence, precision measurements using top quark events are possible with enough statistics.
I will present a research proposal on this subject in which all event information is used to build a likelihood to obtain the most probable values for the Wtb anomalous couplings in single-top.

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