Nucleon to Delta transition form factors with $N_F=2+1$ domain wall fermions

Abstract

We calculate the electromagnetic, axial and pseudo-scalar form factors of the Nucleon to $\Delta (1232)$ transition using two dynamical light degenerate quarks and a dynamical strange quark simulated with the domain wall fermion action. Results are obtained at lattice spacings $a=0.114$ fm and $a=0.084$ fm, with corresponding pion masses of $330$ MeV and $297$ MeV, respectively. High statistics measurements are achieved by utilizing the coherent sink technique. The dominant electromagnetic dipole form factor, the axial form factors and the pseudo-scalar coupling are extracted to a good accuracy. This allows the investigation of the non-diagonal Goldberger-Treiman relation. Particular emphasis is given on the extraction of the sub-dominant electromagnetic quadrupole form factors and their ratio to the dominant dipole form factor, $R_{EM}$ and $R_{SM}$, measured in experiment.

31 pages, 10 figures

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• Nucleon Electromagnetic Form Factors
• Nucleon electromagnetic form factors
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• Pion electroproduction measurements in the nucleon resonance region
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