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In this thesis we investigated, at partonic level and leading order, the LHCpotencial operating with $\sqrt{s}=14$ TeV and integrated luminosity of$L=100\;{fb}^{-1}$ to probe "pure" (without triple vertex contributions)anomalous electroweak quartic couplings, $WWWW$ and $WWZZ$, in the semileptonic$pp \rightarrow l^{\pm}\nu_{l}jjjj$ channel, enhanced by the Vector BosonFusion collider signatures. Deviations on SM quartic couplings wereparameterized in a model independent approach, realized linearly ($L_{S0}$ and$L_{S1}$ operators) or not ($L_{4}$ and $L_{5}$ operators), on the basis ofeffective lagrangians. Being our analysis essentially events counting-and-cutbased, we took into account all possible backgrounds (irreducible, QCD and topquarks processes) considered at ${\cal O}(\alpha_{em}^{6})$, ${\calO(\alpha_{em}^{4}\alpha_{s}^{2})$ and ${\calO}(\alpha_{em}^{2}\alpha_{s}^{4})$. In this way, we have obtained the followingconstraints for the non-linear $\alpha_{4}$ and $\alpha_{5}$ anomalouscouplings: $|\alpha_{4,5}| \lesssim 0.01$ to 0.02 at 3$\sigma$. Based onnon-linear results, we have estimated, for a specific choice of factorizationand renormalization scale, the linear parameters $f_{0}$ and $f_{1}$constraints as $-22 \leq \dfrac{f_{0}}{\Lambda^{4}}\;({TeV}^{-4}) \leq 20,\quad {and} \quad -26 \leq \dfrac{f_{1}}{\Lambda^{4}}\;({TeV}^{-4}) \leq 24$ at3$\sigma$. On a different approach, manipulating one extension of the SM named$331_{RHN}$, we have evaluated the contribution of new sources of FCNC for thedifference of mass of neutral meson systems, $K_{0}-\bar{K_{0}}$,$D^{0}-\bar{D^0}$ and $B^0_d-\bar{B^0_d}$. Bounds related to these systems maybe significantly strengthened in the presence of these new interactionsallowing stronger constraints on the parameter space of the model.

Searches for New Physics in the Standard Model's Electroweak Sector:  Quartic Anomalous Couplings with Vector Boson Fusion and Flavor Changed  Neutral Current in the $SU(3)_{C}\otimes SU(3)_{L}\otimes U(1)_{X}$ model