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Delta-baryon electromagnetic form factors in lattice QCD

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arxiv 0810.3976 v1 pith:XTQSIMBC submitted 2008-10-22 hep-lat

Delta-baryon electromagnetic form factors in lattice QCD

C. Alexandrou , T. Korzec , G. Koutsou , Th. Leontiou (U. of Cyprus) , C. Lorc\'e (U. of Mainz) , J. W. Negele (MIT) V. Pascalutsa (U. of Mainz) , A. Tsapalis (U. of Athens) , M. Vanderhaeghen (U. of Mainz) This is my paper
classification hep-lat
keywords deltaquarksformdynamicalelectromagneticfactorsflavorslattice
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We develop techniques to calculate the four Delta electromagnetic form factors using lattice QCD, with particular emphasis on the sub-dominant electric quadrupole form factor that probes deformation of the Delta. 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 Delta is chirally extrapolated to the physical point and the Delta charge density distributions are discussed.

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