Composite operators in $$ T\overline{T} $$-deformed free QFTs

We study perturbative renormalization of the composite operators in $T\bar T$-deformed two-dimensional free field theories. The pattern for stress-energy tensor is different massive and massless cases. While latter case canonical stress not renormalized up to high order expansion, theory there are induced counterterms at linear order. For a our results match general formula derived recently [1].