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The importance of the H -> ZZ -> 4l "golden" channel was shown by its majorrole in the discovery, by the ATLAS and CMS collaborations, of a Higgs-likeboson with mass near 125 GeV. We analyze the discrimination power of the matrixelement method both for separating the signal from the irreducible ZZbackground and for distinguishing various spin and parity hypotheses describinga signal in this channel. We show that the proper treatment of interferenceeffects associated with permutations of identical leptons in the four electronand four muon final states plays an important role in achieving the bestsensitivity in measuring the properties of the newly discovered boson. Weprovide a code, MEKD, that calculates kinematic discriminants based on the fullleading order matrix elements and which will aid experimentalists andphenomenologists in their continuing studies of the H -> ZZ -> 4l channel.

Precision studies of the Higgs boson decay channel H -> ZZ -> 4l with MEKD