The nucleon to Delta electromagnetic transition form factors in lattice QCD

Details The nucleon to Delta electromagnetic transition form factors in lattice QCD The nucleon to Delta electromagnetic transition form factors in lattice QCD

2007-10-25

arxiv.org/abs/0710.4621v1

Phys.Rev.D77:085012,2008

Physics

High Energy Physics

High Energy Physics - Lattice

15 pages, 8 Figures

Scientific paper

10.1103/PhysRevD.77.085012

The electromagnetic nucleon to Delta 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 quadrupole form factors are evaluated for the first time in full QCD to sufficient accuracy to exclude a zero value, which is taken as a signal for deformation in the nucleon-Delta system. For the Coulomb quadrupole form factor the unquenched results show deviations from the quenched results at low q^2 bringing dynamical lattice results closer to experiment, thereby confirming the importance of pion cloud contributions on this quantity.

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