M. Constantinou

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P Pack, S. Pailer, R. Pal, S. Panken, F. Papadias, D. Papadimitratos, P. Papadimitriou, G. I. Papadopoulos, C. Papantoni, T. Parashar, M. Passarella, A. Passas, N. Pelsser, C. Pelusi, L. Peyravian, M. Pitsillides, A. Pokorn, J. Politis, C. Pong, D. Prasad, N. R. As a token of my deep appreciation for their professionalism and dedication to the ideals of our(More)
We present the corrections to the fermion propagator, to second order in the lattice spacing a, in 1-loop perturbation theory. The fermions are described by the clover action and for the gluons we use a 3-parameter family of Symanzik improved actions. Our calculation has been carried out in a general covariant gauge. The results are provided as a polynomial(More)
We briefly report our calculation of the 2-loop coefficient of the coupling constant renormalization function Zg in lattice perturbation theory. The quantity under study is defined through g0 = Zg g, where g0 (g) is the bare (renormalized) coupling constant. The 2-loop expression for Zg can be directly related to the 3-loop bare β -function βL(g0). Our(More)
We study a systematic improvement of perturbation theory for gauge fields on the lattice [1]; the improvement entails resumming, to all orders in the coupling constant, a dominant subclass of tadpole diagrams. This method, originally proposed for the Wilson gluon action [2], is extended here to encompass all possible gluon actions made of closed Wilson(More)
We calculate the critical value of the hopping parameter, κc, in Lattice QCD, up to two loops in perturbation theory. We employ the Sheikholeslami-Wohlert (clover) improved action for Wilson fermions and the Symanzik improved gluon action for 4and 6-link loops. The quantity which we study is a typical case of a vacuum expectation value resulting in an(More)
We perform a lattice computation of the flavour octet contribution to the average quark momentum in the nucleon, 〈x〉 μ2=4 GeV2 . In particular, we fully take the disconnected contributions into account in our analysis for which we use a generalization of the technique developed in [1]. We investigate systematic effects with particular emphasis on the(More)
We present a stochastic method for the calculation of baryon three-point functions that ismore versatile than the typically used sequential method. We analyze the scaling of the error of the stochastically evaluated three-point function with the lattice volume, and we found a favorable signal-to-noise ratio suggesting that our stochastic method can be used(More)
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