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- Andrea Acquaviva, Andrea Adami, +224 authors N. R. Prasad
- IEEE Network
- 2006

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)

- Constantia Alexandrou, M. Constantinou, +5 authors A. Vaquero
- Computer Physics Communications
- 2014

- M. Constantinou, H. Panagopoulos, Fotos Stylianou
- 2008

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)

- M. Constantinou, H. Panagopoulos, Apostolos Skouroupathis
- 2006

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)

- Apostolos Skouroupathis, M. Constantinou, H. Panagopoulos
- 2006

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)

- Constantia Alexandrou, M. Constantinou, +4 authors Giannis Koutsoua
- 2015

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)

- Constantia Alexandrou, M. Constantinou, +4 authors Dru B. Renner
- 2014

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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