We present a first scaling test of twisted mass QCD with pure Wilson quarks for a twisting angle of pi/2. We have computed the vector meson mass m(V) and the pseudoscalar decay constant F-PS for different values of at fixed value of r(0)m(PS). The results obtained in the quenched approximation are compared with data for pure Wilson and non-perturbatively O(a) improved Wilson computations. We show that our results from Wilson twisted mass QCD show clearly reduced lattice spacing errors, consistent with O(a) improvement and without the need of any improvement terms added. These results thus provide numerical evidence of the prediction of Frezzotti and Rossi hep-lat/0306014. (C) 2004 Elsevier B.V. All rights reserved.
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