Four-point functions and contact terms from higher-spin Ward identities of Chern-Simons-matter theory

Large N quasifermionic Chern-Simons-matter theories exhibit weakly-broken higher-spin symmetry and contain an infinite-dimensional algebra of almost-conserved higher-spin currents. By analyzing local higher-spin Ward identities, we constrain the higher-spin algebra of this theory, for operators of spin s<4. The solution interpolates smoothly between Ward identities of free fermionic and critical bosonic U (N) models, in accordance with the bosonization duality. At finite 't Hooft coupling, we decompose four-point current correlators involving (J₃) ^QF in terms of free theory structures. Additionally, we find that higher correlators of the theory develop scheme-independent higher-spin contact terms, stemming from the presence of a background Chern-Simons term in the effective action. These terms are related to similar contact terms of the associated quasibosonic Chern-Simons-matter theory via Legendre transform. The results are supplemented by perturbative checks, including collinear limit computations of T--J_+J_+ₐ₅, T--J_+J_+Oₐ₅ and J -- J_+J_+J_+ₐ₅.