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We present results for the renormalization constants of bilinear quarkoperators obtained by using the tree-level Symanzik improved gauge action andthe Nf=2 twisted mass fermion action at maximal twist, which guaranteesautomatic O(a)-improvement. Our results are also relevant for the correspondingstandard (un-twisted) Wilson fermionic action since the two actions onlydiffer, in the massless limit, by a chiral rotation of the quark fields. Thescale-independent renormalization constants ZV, ZA and the ratio ZP/ZS havebeen computed using the RI-MOM approach, as well as other alternative methods.For ZA and ZP/ZS, the latter are based on both standard twisted mass andOsterwalder-Seiler fermions, while for ZV a Ward Identity has been used. Thequark field renormalization constant Zq and the scale dependent renormalizationconstants ZS, ZP and ZT are determined in the RI-MOM scheme. Leadingdiscretization effects of O(g^2 a^2), evaluated in one-loop perturbationtheory, are explicitly subtracted from the RI-MOM estimates.

Non-perturbative renormalization of quark bilinear operators with Nf=2 (tmQCD) Wilson fermions and the tree-level improved gauge action