# A What is a dressing function?

#### RicardoMP

Consider, for example, the gluon propagator $$D^{\mu\nu}(q)=-\frac{i}{q^2+i\epsilon}[D(q^2)T^{\mu\nu}_q+\xi L^{\mu\nu}_q]$$

What exactly is the renormalized gluon dressing function $D(q^2)$ and what is its definition? My interest is in knowing if I can then write the bare version of this function simply as $D_B(q^2)=Z_AD(q^2)$, where $Z_A$ is the renormalization constant for the gluon field ($A_B=Z_A^{\frac{1}{2}}A$).

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