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The light-front formalism for a covariant description of the European MuonCollaboration (EMC) effect, already applied to $^3$He, is formally extended toany nucleus, and used for actually calculating the $^3$H and $^4$He cases. Therealistic and accurate nuclear description of few-nucleon bound systems,obtained with both phenomenological and chiral potentials, has been properlycombined with the Poincare' covariance and macroscopic locality, automaticallysatisfying both number of particles and momentum sum rule. While retaining theon-mass-shell nucleon structure functions, one is then able to predict asizable EMC effect for $^4$He, as already observed for $^3$He. Moreover, theimpact on the EMC effect of both i) the short-range correlations, such as thosegenerated by modern nuclear interactions, and ii) the ratio between the neutronand proton structure functions has been studied. The short-range correlationsgenerated by retaining only the standard nuclear degrees of freedom act on thedepth of the minimum in the EMC ratio, while the uncertainties linked to theratio of neutron to proton structure functions are found to be very small.These light-front results facilitates ascribing deviations from experimentaldata due to genuine QCD effects, not included in a standard nucleardescription, and initiating unbiased investigations.

The EMC effect for few-nucleon bound systems in Light-Front Hamiltonian Dynamics