Electromagnetic Structure of Light Baryons in Lattice QCD
Duncan, A. · Eichten, E. · Thacker, H.
Original · EN
A method for computing electromagnetic properties of hadrons in lattice QCD is applied to the extraction of electromagnetic properties of the octet baryons. This allows a determination of the full dependence of the baryon masses on the charges and masses of the valence quarks. Results of a first numerical study (at β=5.7 with Wilson action and light quark masses fixed from the pseudoscalar meson spectrum) are reported. The octet baryon isomultiplet splittings (with statistical errors) are found to be: N - P = 1.55(± 0.56), Σ⁰ - Σ+ = 2.47(± 0.39), Σ- - Σ⁰ = 4.63(± 0.36) and Ξ- - Ξ⁰ = 5.68(± 0.24) MeV. Estimates of the systematic corrections arising from finite volume and the quenched approximation are included in these results.
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