  Interferences are not positive-definite and therefore they can change sign
over the phase space. If the contributions of the regions where the
interference is positive and negative nearly cancel each other, interference
effects are hard to measure. In this paper, we propose a method to quantify the
ability of an observable to separate an interference positive and negative
contributions and therefore to revive the interference effects in measurements.
We apply this method to the anomalous gluon operator in the SMEFT for which the
interference suppression is well-known. We show that we can get contraints on
its coefficient, using the interference only, similar to those obtained by
including the square of the new physics amplitude.
