Estimates of isospin breaking contributions to baryon masses
- Department of Physics, Astronomy and Geosciences, Towson University, Towson Maryland 21252 (United States)
We estimate the isospin breaking contributions to the baryon masses which we analyzed recently using a loop expansion in the heavy-baryon chiral effective field theory. To one loop, the isospin breaking corrections come from the effects of the d, u quark mass difference, the Coulomb and magnetic moment interactions, and effective point interactions attributable to color-magnetic effects. The addition of the first meson loop corrections introduces new structure. We estimate the resulting low-energy, long-range contributions to the mass splittings by regularizing the loop integrals using connections to dynamical models for finite-size baryons. We find that the resulting contributions to the isospin breaking corrections are of the right general size, have the correct sign pattern, and agree with the experimental values within the margin of error.
- OSTI ID:
- 21032317
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 76, Issue 7; Other Information: DOI: 10.1103/PhysRevD.76.073004; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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