3 papers
hep-ph1998
Two Topics in Chiral Effective Lagrangians
Hidenaga Yamagishi, Ismail Zahed
In the absence of nucleons, we use partial wave unitarity, to show that the chiral expansion parameter must be close to rather than as previously su…
hep-ph1995
The Pion-Nucleon Sigma Term and the Goldberger-Treiman Discrepancy
James V. Steele, Hidenaga Yamagishi, Ismail Zahed
The pion-nucleon sigma term is shown to be equal to the Goldberger-Treiman discrepancy at tree level. Its value estimated this way is very sensitive to the pion-nucleon coupling co…
hep-ph1995
BRST Quantization, Strong CP Violation, the U(1) Problem and Vacua
Hidenaga Yamagishi, Ismail Zahed
The non-perturbative implications of BRST quantization are examined for vacua and related issues. Strong CP violation is shown to be absent for QCD in the BRST formalism. Previ…