Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2004-09-19
Phys.Rev.Lett.94:021601,2005
Physics
High Energy Physics
High Energy Physics - Lattice
4 pages, 3 figures
Scientific paper
10.1103/PhysRevLett.94.021601
The magnetic dipole, the electric quadrupole and the Coulomb quadrupole amplitudes for the transition \gamma N\to \Delta are calculated in quenched lattice QCD at \beta=6.0 with Wilson fermions. Using a new method combining an optimal combination of interpolating fields for the $\Delta$ and an overconstrained analysis, we obtain statistically accurate results for the dipole form factor and for the ratios of the electric and Coulomb quadrupole amplitudes to the magnetic dipole amplitude, R_{EM} and R_{SM}, up to momentum transfer squared 1.5 GeV^2. We show for the first time using lattice QCD that both R_{EM} and R_{SM} are non-zero and negative, in qualitative agreement with experiment and indicating the presence of deformation in the N- Delta system.
Alexandrou Constantia
Forcrand Ph de
Neff Hartmut
Negele John W.
Schroers Wolfram
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