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Renormalization constants for 2-twist operators in twisted mass QCD · Around

2010

Renormalization constants for 2-twist operators in twisted mass QCD

Alexandrou, C., Constantinou, M., Korzec, T. et al.

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Perturbative and non-perturbative results on the renormalization constants of the fermion field and the twist-2 fermion bilinears are presented with emphasis on the non-perturbative evaluation of the one-derivative twist-2 vector and axial vector operators.

Non-perturbative results are obtained using the twisted mass Wilson fermion formulation employing two degenerate dynamical quarks and the tree-level Symanzik improved gluon action.
The simulations have been performed for pion masses in the range of about 450-260 MeV and at three values of the lattice spacing $a$ corresponding to $\beta=3.9, 4.05, 4.20$.
Subtraction of ${\cal O}(a^2)$ terms is carried out by performing the perturbative evaluation of these operators at 1-loop and up to ${\cal O}(a^2)$.

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Then

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C. Alexandrou et al. (ETMC) (2008), eprint arXiv:0811.0724
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