A template method to measure the tt¯ polarisation

We develop a template method for the measurement of the polarisation of t t ¯ pairs produced in hadron collisions. The method would allow to extract the individual fractions of t L t ¯ L , t R t ¯ R , t L t ¯ R and t R t ¯ L pairs with a fit to data, where L , R refer to the polarisation along any axis. These polarisation fractions have not been independently measured at present. Secondarily, the method also provides the net polarisation of t and t ¯ , as well as their spin correlation for arbitrary axes.