  The study of the Higgs couplings following its discovery is the priority of
future LHC runs. A hint of anomalous nature will be exhibited via its coupling
to the Standard Model(SM) particles and open up new domain of phenomenological
study of physics beyond the Standard Model. The enhanced statistics from next
LHC runs will enable entry into the precision era to study the properties of
Higgs with greater details. In this paper we present how one can extract Higgs
couplings in future LHC runs at 14 TeV via $H \rightarrow Z Z^* \rightarrow 4
\ell$, using observables constructed from angular distributions for the
Standard Model Higgs and Higgs with mixed CP configuration. We show how angular
asymmetries can be used to measure the ratios of the couplings and the relative
phases at LHC. We benchmark our analysis finding out the angular asymmetries
and the best fit values of the ratios of the couplings for SM Higgs, CP-odd
admixture, CP-even higher derivative contribution and when CP-even higher
derivative contribution and CP-odd admixture are both present. In the Standard
Model, $HZZ$ couplings have no momentum dependence. It is thus essential to
demonstrate the momentum independence of the couplings to establish the
couplings are SM like in nature. In this work we show how one can test the
momentum independence of the Standard Model like coupling using angular
asymmetries. We develop the necessary tools and demonstrate how to study the
momentum dependence can be studied at future LHC runs.
