Browsing by Author "Neff, H."

Now showing items 1-6 of 6

    • Article  

      Calculation of the N to Δ electromagnetic transition matrix element 

      Alexandrou, Constantia; de Forcrand, Ph; Lippert, Th; Neff, H.; Negele, J. W.; Schilling, K.; Schroers, W.; Tsapalis, Antonios (2003)
      We present results on the ratio of electric quadrupole to magnetic dipole amplitudes, REM = GE2/GM1, for the transition γN → Δ from lattice QCD. We consider both the quenched and the 2-flavor theory.
    • Article  

      Momentum dependence of the N to Δ transition form factors 

      Alexandrou, Constantia; de Forcrand, Ph; Neff, H.; Negele, J. W.; Schroers, W.; Tsapalis, Antonios (2005)
      We present a new method to determine the momentum dependence of the N to Δ transition form factors and demonstrate its effectiveness in the quenched theory at β = 6.0 on a 323 × 64 lattice. We address a number of technical ...
    • 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  

      N-to-Δ electromagnetic-transition form factors from lattice QCD 

      Alexandrou, Constantia; De Forcrand, P.; Neff, H.; Negele, J. W.; Schroers, W.; Tsapalis, Antonios (2005)
      The magnetic dipole (M1), the electric quadrupole (E2), and the Coulomb quadrupole (C2) amplitudes for γN → Δ are calculated in quenched lattice QCD. Using a new method, which combines an optimal choice of interpolating ...
    • Article  

      Nucleon to delta electromagnetic transition form factors in lattice QCD 

      Alexandrou, Constantia; Koutsou, Giannis; Neff, H.; Negele, J. W.; Schroers, W.; Tsapalis, Antonios (2008)
      The electromagnetic nucleon to Δ transition form factors are evaluated using two degenerate flavors of dynamical Wilson fermions and using dynamical sea staggered fermions with domain-wall valence quarks. The two subdominant ...
    • Article  

      γN → Δ transition form factors in Quenched and NF = 2 QCD 

      Alexandrou, Constantia; de Forcrand, Ph; Lippert, Th; Neff, H.; Negele, J. W.; Schilling, K.; Schroers, W.; Tsapalis, Antonios (2004)
      Calculations of the magnetic dipole, electric quadrupole and Coulomb quadrupole amplitudes for the transition γN → Δ are presented both in quenched QCD and with two flavours of degenerate dynamical quarks. © 2004 Published ...