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RI/MOM renormalization constants (N_f=4) and the strong coupling constant (N_f=2+1+1) from twisted-mass QCD

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arxiv 1111.3023 v1 pith:2RL4Y3LT submitted 2011-11-13 hep-lat

classification hep-lat
keywords constantconstantscouplingrenormalizationstrongtwisted-massablealpha
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We study RI/MOM renormalization constants of bilinear quark operators for $N_f=4$ and the strong coupling constant for $N_f=2+1+1$ using Wilson twisted-mass fermions. We use the "egalitarian" method to remove H(4) hypercubic artifacts non-perturbatively, which enables us to study physical quantities in a wide range of momenta. We then apply OPE in studying the running behavior of $Z_q$ and $\alpha_s$, from which we are able to extract the Landau gauge dimension-two gluon condensate $<A^2>$ which is of phenomenological interest.

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