Search for anomalous couplings in the $Wtb$ vertex from the measurement of double differential angular decay rates of single top quarks produced in the $t$-channel with the ATLAS detector

Understand

The electroweak production and subsequent decay of single top quarks is determined by the properties of the $Wtb$ vertex.

• This vertex can be described by the complex parameters of an effective Lagrangian.
• An analysis of angular distributions of the decay products of single top quarks produced in the $t$-channel constrains these parameters simultaneously.
• The analysis described in this paper uses 4.6 fb$^{-1}$ of proton-proton collision data at $\sqrt{s}$ = 7 TeV collected with the ATLAS detector at the LHC.Two parameters are measured simultaneously in this analysis.