Tau lepton reconstruction at collider experiments using impact parameters

We present a method for the reconstruction of events containing hadronically decaying τ leptons at collider experiments. This method relies on accurate knowledge of the τ production vertex and precise measurement of its decay products. The method makes no assumptions about the τ kinematics, and is insensitive to momentum loss along the beam direction. We demonstrate the method using e+e−→μ+μ−τ+τ−e+e−→μ+μ−τ+τ− events fully simulated in the ILD detector.