Measurement of the W boson helicity using top pair events at $\sqrt{s}$ = 8 TeV with the CMS detector

This document gives an overview over the recent results on helicity measurement of W boson originated from top pair events. The results are obtained using data collected by the CMS detector at a center-of-mass energy of 8 TeV. The helicity measurements are confronted with the most precise theoretical predictions of the standard model.