Browsing by Author "De Forcrand, Ph"

Now showing items 1-10 of 10

    • Article  

      Evidence for diquarks in lattice QCD 

      Alexandrou, Constantia; De Forcrand, Ph; Lucini, B. (2006)
      Diquarks may play an important role in hadron spectroscopy, baryon decays, and color superconductivity. We investigate the existence of diquark correlations in lattice QCD by considering systematically all the lowest energy ...
    • Article  

      Gluon propagator without lattice Gribov copies 

      Alexandrou, Constantia; De Forcrand, Ph; Follana, E. (2001)
      We study the gluon propagator in quenched lattice QCD using the Laplacian gauge which is free of lattice Gribov copies. We compare our results with those obtained in the Landau gauge on the lattice, as well as with various ...
    • Article  

      Gluon propagator without lattice Gribov copies on a finer lattice 

      Alexandrou, Constantia; De Forcrand, Ph; Follana, E. (2002)
      We extend our study of the gluon propagator in quenched lattice QCD using the Laplacian gauge to a finer lattice. We verify the existence of a pole mass as we take the continuum limit and deduce a value of ∼600-30 +150 MeV ...
    • Article  

      Improved multiboson algorithm 

      Alexandrou, Constantia; De Forcrand, Ph; D'Elia, M.; Panagopoulos, Haralambos G. (2000)
      We compare the performance of an UV-filtered Multiboson algorithm, including a global quasi-heatbath update, to the standard Hybrid Monte Carlo algorithm in full QCD with two flavours of Wilson fermions.
    • Article  

      Matter and pseudoscalar densities in lattice QCD 

      Alexandrou, Constantia; De Forcrand, Ph; Tsapalis, Antonios (2003)
      The matter and the pseudoscalar densities inside a hadron are calculated via gauge-invariant equal-time correlation functions. A comparison is made between the charge and the matter density distributions for the pion, the ...
    • Article  

      N to Δ electromagnetic transition form factors from lattice QCD 

      Alexandrou, Constantia; De Forcrand, Ph; Lippert, Th; Neff, H.; Negele, J. W.; Schilling, K.; Schroers, W.; Tsapalis, Antonios (2004)
      The magnetic dipole, the electric quadrupole, and the Coulomb quadrupole amplitudes for the transition γN→Δ are evaluated both in quenched lattice QCD at β=6.0 and using two dynamical Wilson fermions simulated at β=5.6. ...
    • Article  

      Probing hadron wave functions in lattice QCD 

      Alexandrou, Constantia; De Forcrand, Ph; Tsapalis, Antonios (2002)
      Gauge-invariant equal-time correlation functions are calculated in lattice QCD within the quenched approximation and with two dynamical quark species. These correlators provide information on the shape and multipole moments ...
    • Article  

      The relevance of center vortices 

      Alexandrou, Constantia; D'Elia, M.; De Forcrand, Ph (2000)
      We show remnants of chiral symmetry breaking in the center-projected theory. We construct and study an unambiguous definition of center vortices.
    • Article  

      The role of center vortices in QCD 

      Alexandrou, Constantia; De Forcrand, Ph; D'Elia, M. (2000)
      Center vortices are unambiguously identified after Laplacian Center Gauge fixing and their influence on confinement and chiral symmetry breaking is investigated on a sample of SU(2) configurations at zero and finite temperature.
    • Article  

      Static three-quark SU(3) and four-quark SU(4) potentials 

      Alexandrou, Constantia; De Forcrand, Ph; Tsapalis, Antonios (2002)
      We present results on the static three- and four-quark potentials in SU(3) and SU(4), respectively, within quenched lattice QCD. We use an analytic multihit procedure for the time links and a variational approach to determine ...