2007/10/25 by Constantia Alexandrou, C. Alexandrou, Giannis Koutsou +6 · 3 citations
Physics and Astronomy · #Particle physics theoretical and experimental studies #Physics of Superconductivity and Magnetism #Quantum Chromodynamics and Particle Interactions #hep-lat
paper · pdf · doi:10.1103/physrevd.77.085012
published as Phys.Rev.D77:085012,2008 · 15 pages, 8 Figures
arxiv created 2007/10/25 · openalex publication_date 2008/04/17 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The electromagnetic nucleon to \ensuremathΔ 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-\ensuremathΔ system. For the Coulomb quadrupole form factor the unquenched results begin to deviate from the quenched results at low q2 indicating that dynamical lattice results are closer to experiment. This can be taken as a first confirmation of the expected importance of pion cloud contributions on this quantity.