Measurement of τ Polarization in W→τν Decays with the ATLAS Detector in pp Collisions at

In this proceedings, the first measurement of τ polarization at a hadron collider is presented. The method for extracting the τ polarization is independent of the mode of τ production and can be applied to the characterization of new phenomena at the Large Hadron Collider. The method has been applied to W→τν decays and the measured value of is in agreement with the Standard Model prediction.