Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-02-09
Phys.Rev.D71:073015,2005; Erratum-ibid.D75:039903,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
RevTeX4, 27 pages, 9 figures
Scientific paper
10.1103/PhysRevD.71.073015
We analyze the electromagnetic contributions to the octet and decuplet baryon masses using the heavy baryon approximation in chiral effective field theory and methods we developed in earlier analyses of the baryon masses and magnetic moments. Our methods connect simply to Morpurgo's general parametrization of the electromagnetic contributions and to semirelativistic quark models. Our calculations are carried out including the one-loop mesonic corrections to the basic electromagnetic interactions, so to two loops overall. We find that to this order in the chiral loop expansion there are no three-body contributions. The Coleman-Glashow relation and other sum rules derived in quark models with only two-body terms therefore continue to hold, and violations involve at least three-loop processes and can be expected to be quite small. We present the complete formal results and some estimates of the matrix elements here. Numerical calculations will be presented separately.
Durand Loyal
Ha Phuoc
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