Electromagnetic form factors of the Ω- in lattice QCD
Author(s)
Negele, John W.; Alexandrou, Constantia; Korzec, Tomasz; Koutsou, Giannis; Proestos, Y.
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Alternative title
Electromagnetic form factors of the Ω- [omega baryon] in lattice QCD
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We present results on the omega baryon (Ω-) 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 Ω-[omega baryon] magnetic moment, μΩ- [mu omega baryon], and the electric charge and magnetic radius,(r[superscript 2 subscript E0/M1),are extracted for these pion masses. The electric quadrupole moment is determined for the first time using dynamical quarks.
Date issued
2010-08Department
Massachusetts Institute of Technology. Center for Theoretical Physics; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Physical review D
Publisher
American Physical Society
Citation
Alexandrou, C. et al. “Electromagnetic form factors of the Ω^{-} in lattice QCD.” Physical Review D 82.3 (2010): n. pag. © 2010 The American Physical Society
Version: Final published version
ISSN
1550-7998
1550-2368