A method for computing electromagnetic properties of hadrons in quenched 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 quenched octet baryon isomultiplet splittings (with statistical errors) are found to be: N − P = 2.08(±0.56),
Σ
0 −
Σ
+ = 2.63(±0.39),
Σ
− −
Σ
0 = 4.90(±0.36) and
Ξ
− −
Ξ
0 = 5.58(±0.24) MeV. Estimates of the systematic electromagnetic corrections arising from finite volume are included in these results.
We construct a prototype of topcolor-assisted technicolor in which, although both top and bottom quarks acquire some mass from extended technicolor, strong
U(1) couplings of technifermions are ...isospin symmetric and all gauge anomalies vanish. There is a mechanism for mixing between the light and heavy generations and there need be no very light pseudo-Goldstone bosons.
Chiral multiplets of heavy-light mesons Bardeen, William A.; Eichten, Estia J.; Hill, Christopher T.
Physical review. D, Particles and fields,
09/2003, Volume:
68, Issue:
5
Journal Article
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