2010/06/03 by C. Alexandrou, Constantia Alexandrou, T. Korzec +7
Physics and Astronomy · #Atomic physics #Baryon #Charge (physics) #Fermion #High-Energy Particle Collisions Research #Omega #Particle physics #Particle physics theoretical and experimental studies #Physics #Pion #Quadrupole #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #Valence (chemistry) #hep-lat #hep-ph #nucl-th
paper · pdf · doi:10.1103/physrevd.82.034504
published as Phys.Rev.D82:034504,2010 · 13 pages, 10 Figures
arxiv created 2010/06/03 · openalex publication_date 2010/08/05 · arxiv updated 2014/11/21 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present results on the omega baryon (\ensuremathΩ^\ensuremath-) electromagnetic form factors using Nf=2+1 domain-wall fermion configurations for three pion masses in the range of about 350 to 300 MeV. We compare results obtained using domain-wall fermions with those of a mixed-action (hybrid) approach, which combines domain-wall valence quarks on staggered sea quarks, for a pion mass of about 350 MeV. We pay particular attention in the evaluation of the subdominant electric quadrupole form factor to sufficient accuracy to exclude a zero value, by constructing a sequential source that isolates it from the dominant form factors. The \ensuremathΩ^\ensuremath- magnetic moment, \ensuremathμ_\ensuremathΩ^\ensuremath-, and the electric charge and magnetic radius, ⟨rE0/M12⟩, are extracted for these pion masses. The electric quadrupole moment is determined for the first time using dynamical quarks.