3 papers
hep-ph2008
Chiral Symmetry of Nucleon Resonances in QCD sum rules
T. Nakamura, P. Gubler, M. Oka
The QCD sum rule approach is employed in order to study chiral properties of positive- and negative-parity nucleon resonances. It is pointed out that nucleons with an ``exotic'' ch…
nucl-th2004
Sigma Exchange in the Nonmesonic Decays of Light Hypernuclei and Violation of the Delta I=1/2 Rule
K. Sasaki, M. Izaki, M. Oka
Nonmesonic weak decays of s-shell hypernuclei are analyzed in microscopic models for the Lambda N to NN weak interaction. A scalar-isoscalar meson, sigma, is introduced and its imp…
hep-ph2003
Chiral symmetry aspects of positive and negative parity baryons
A. Hosaka, D. Jido, M. Oka
Chiral symmetry aspects for baryon properties are studied. After a brief discussion on general framework, we introduce two distinctive chiral group representations for baryons: the…