Electromagnetic structure of the lowest-lying decuplet resonances in covariant chiral perturbation theory
Abstract
We present a calculation of the leading SU(3)-breaking O(p3)-corrections to the electromagnetic moments and charge radius (CR) of the lowest-lying decuplet resonances in covariant chiral perturbation theory. In particular, the magnetic dipole moment (MDM) of the members of the decuplet is predicted fixing the only low-energy constant (LEC) present up to this order with the well measured MDM of the -. We predict μ++=6.04(13) and μ+=2.84(2) which agree well with the current experimental information. For the electric quadrupole moment (EQM) and the CR we use state-of-the-art lattice QCD results to determine the corresponding LECs, whereas for the magnetic octupole moment (MOM) there is no unknown LEC up to the order considered here and we obtain a pure prediction. We compare our results with those reported in large Nc, lattice QCD, heavy-baryon chiral perturbation theory and other models.