The Decuplet Revisited in $χ$PT

Details The Decuplet Revisited in $χ$PT The Decuplet Revisited in $χ$PT

1995-08-21

arxiv.org/abs/hep-ph/9508340v1

Phys.Rev. D54 (1996) 5804-5811

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages of double column revtex, no figures

Scientific paper

10.1103/PhysRevD.54.5804

The paper deals with two issues. First, we explore the quantitiative importance of higher multiplets for properties of the $\Delta$ decuplet in chiral perturbation theory. In particular, it is found that the lowest order one--loop contributions from the Roper octet to the decuplet masses and magnetic moments are substantial. The relevance of these results to the chiral expansion in general is discussed. The exact values of the magnetic moments depend upon delicate cancellations involving ill--determined coupling constants. Second, we present new relations between the magnetic moments of the $\Delta$ decuplet that are independent of all couplings. They are exact at the order of the chiral expansion used in this paper.

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