Δ-baryon electromagnetic form factors in lattice QCD
Ημερομηνία
2009Συγγραφέας
Alexandrou, ConstantiaKorzec, T.
Koutsou, Giannis
Leontiou, Theodoros
Lorcé, C.
Negele, J. W.
Pascalutsa, V.
Tsapalis, Antonios
Vanderhaeghen, M.
ISSN
1550-7998Source
Physical Review D - Particles, Fields, Gravitation and CosmologyVolume
79Issue
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Metadata
Εμφάνιση πλήρους εγγραφήςΕπιτομή
We develop techniques to calculate the four Δ electromagnetic form factors using lattice QCD, with particular emphasis on the subdominant electric quadrupole form factor that probes deformation of the Δ. Results are presented for pion masses down to approximately 350 MeV for three cases: quenched QCD, two flavors of dynamical Wilson quarks, and three flavors of quarks described by a mixed action combining domain-wall valence quarks and dynamical staggered sea quarks. The magnetic moment of the Δ is compared with chiral effective field theory calculations and the Δ charge density distributions are discussed. © 2009 The American Physical Society.