Negative-Parity Baryon Spectroscopy

Abstract

Results are reported for the first calculation of the low-lying spin-1/2 odd-parity octet baryon masses using $\mathcal{O}(a^2)$ improved gluon and fermion actions. Methods for removing even-parity ground-state contaminations from the two-point correlation functions at zero and finite momenta are outlined. We investigate the properties of two odd-parity interpolating fields based on the established interpolating fields for the nucleon ground state. Isolation of the lowest-lying odd-parity state appears to be sufficient to begin exploring odd-parity $N\to N^{\ast }$ electromagnetic transition form factors.

Comments: LATTICE98(spectrum), 3 pages, 1 figure; minor typos corrected