Browsing Τμήμα Φυσικής / Department of Physics by Subject "Lattice perturbation theory"

Now showing items 1-6 of 6

    • Article  

      The lattice free energy of QCD with clover fermions, up to three-loops 

      Athenodorou, A.; Panagopoulos, Haralambos G.; Tsapalis, Antonios (2008)
      We calculate the perturbative value of the free energy in Lattice QCD, up to three loops. Our calculation is performed using Wilson gluons and the Sheikholeslami-Wohlert (clover) improved action for fermions. The free ...
    • Article  

      One-loop renormalization of fermionic currents with the overlap-Dirac operator 

      Alexandrou, Constantia; Follana, E.; Panagopoulos, Haralambos G.; Vicari, E. (2000)
      We compute the one-loop lattice renormalization of the two-quark operators ψ̄Γψ, where Γ denotes the generic Dirac matrix, for the lattice formulation of QCD using the overlap-Dirac operator. We also study the renormalization ...
    • Article  

      The three-loop β-function of QCD with the clover action 

      Bode, Achim; Panagopoulos, Haralambos G. (2002)
      We calculate, to 3 loops in perturbation theory, the bare β-function of QCD, formulated on the lattice with the clover fermionic action. The dependence of our result on the number of colors N, the number of fermionic flavors ...
    • Article  

      The three-loop β-function of SU(N) lattice gauge theories with Wilson fermions 

      Christou, Chris; Feo, A.; Panagopoulos, Haralambos G.; Vicari, E. (1998)
      We calculate the third coefficient of the lattice β-function associated with the Wilson formulation for both gauge fields and fermions. This allows us to evaluate the three-loop correction (linear in g2 0) to the relation ...
    • Article  

      The two-loop relation between the bare lattice coupling and the MS coupling in QCD with Wilson fermions 

      Christou, Chris; Feo, A.; Panagopoulos, Haralambos G.; Vicari, E. (1998)
      We calculate the two-loop relation between the coupling renormalized in the MS̄ scheme and the bare lattice coupling g0 in QCD with Wilson fermions, extending the pure gauge results of Lüscher and Weisz. Our calculation ...
    • Article  

      λ-parameter of lattice QCD with the overlap-Dirac operator 

      Alexandrou, Constantia; Panagopoulos, Haralambos G.; Vicari, E. (2000)
      We compute the ratio ΛL/Λ/MS between the scale parameter ΛL, associated with a lattice formulation of QCD using the overlap-Dirac operator, and Λ/MS of the MS renormalization scheme. To this end, the necessary one-loop ...