TY - JOUR
T1 - Excited baryons from Bayesian priors and overlap fermions
AU - Lee, F. X.
AU - Dong, S. J.
AU - Draper, T.
AU - Horváth, I.
AU - Liu, K. F.
AU - Mathur, N.
AU - Zhang, J. B.
PY - 2003/5
Y1 - 2003/5
N2 - Using the constrained-fitting method based on Bayesian priors, we extract the masses of the two lowest states of octet and decuplet baryons with both parities. The calculation is done on quenched 163 × 28 lattices of a = 0.2 fm using an improved gauge action and overlap fermions, with the pion mass as low as 180 MeV. The Roper state N(1440)1/2+ is clearly observed for the first time as the 1st-excited state of the nucleon from the standard interpolating field. Together with other baryons, our preliminary results indicate that the level-ordering of the low-lying baryon states on the lattice is largely consistent with experiment. The realization is helped by cross-overs between the excited 1/2+ and 1/2- states in the region of mπ ∼ 300 to 400 MeV.
AB - Using the constrained-fitting method based on Bayesian priors, we extract the masses of the two lowest states of octet and decuplet baryons with both parities. The calculation is done on quenched 163 × 28 lattices of a = 0.2 fm using an improved gauge action and overlap fermions, with the pion mass as low as 180 MeV. The Roper state N(1440)1/2+ is clearly observed for the first time as the 1st-excited state of the nucleon from the standard interpolating field. Together with other baryons, our preliminary results indicate that the level-ordering of the low-lying baryon states on the lattice is largely consistent with experiment. The realization is helped by cross-overs between the excited 1/2+ and 1/2- states in the region of mπ ∼ 300 to 400 MeV.
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U2 - 10.1016/S0920-5632(03)01543-3
DO - 10.1016/S0920-5632(03)01543-3
M3 - Article
AN - SCOPUS:0037611013
SN - 0920-5632
VL - 119
SP - 296
EP - 298
JO - Nuclear Physics B - Proceedings Supplements
JF - Nuclear Physics B - Proceedings Supplements
ER -