arXiv subjects

S. Alavian

Publications and source records attributed to S. Alavian.

2 recordsLinked to original sources

arXiv2000

Extended BRS Symmetry and Gauge Independence in On-Shell Renormalization Schemes

Extended BRS symmetry is used to prove gauge independence of the fermion renormalization constant $Z_2$ in on-shell QED renormalization schemes. A necessary condition for gauge independence of $Z_2$ in on-shell QCD renormalization schemes is formulated. Satisfying this necessary condition appears to be problematic at the three-loop level in QCD.

hep-th↗

arXiv1997

Sum-Rule Inequalities and a Toy Model Paradox

Fundamental inequalities for QCD sum-rules are applied to resolve a paradox recently encountered in a sum-rule calculation. This paradox was encountered in a toy model known to be free of resonances that yields an apparent resonance using a standard sum-rule stability analysis. Application of the inequalities does not support the existence of a well defined sum-rule calculation, and shows a strong distinction from typical behaviour in QCD.

hep-ph↗