Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2003-07-10
Phys.Rev.D69:114506,2004
Physics
High Energy Physics
High Energy Physics - Lattice
Discussion of systematic errors and chiral extrapolation extended; Typos corrected; Version to appear in Phys. Rev. D.; 19 pag
Scientific paper
10.1103/PhysRevD.69.114506
The magnetic dipole, the electric quadrupole and the Coulomb quadrupole amplitudes for the transition $\gamma N\to \Delta$ are evaluated both in quenched lattice QCD at $\beta=6.0$ and using two dynamical Wilson fermions simulated at $\beta=5.6$. The dipole transition form factor is accurately determined at several values of momentum transfer. On the lattices studied in this work, the electric quadrupole amplitude is found to be non-zero yielding a negative value for the ratio, $ R_{EM}$, of electric quadrupole to magnetic dipole amplitudes at three values of momentum transfer.
Alexandrou Constantia
Forcrand Ph de
Lippert Th.
Neff Hartmut
Negele John W.
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