  The successful LHC operation suggests going beyond the search of excess of
events for the quest of new physics. We demonstrate that the eight multipole
parameters describing the spin state of the W or Z bosons are able to
disentangle their hidden production mechanism. They can be separately extracted
from well defined angular asymmetries in the leptonic distribution of boson
decays. The discriminating power of this analysis is well illustrated by: (i)
polarised top quark decays, (ii) two body decay of heavy resonances, (iii)
Drell-Yan production of Z plus jets, (iv) Z boson plus missing transverse
energy.
