Weinberg like sum rules revisited
University of Bochum, Department of Physics and Astronomy, Theoretical Physics II, 150 Universitätsstrasse, 44780 Bochum, Germany
V. A. Fock Department of Theoretical Physics, St. Petersburg State University, 1 ul. Ulyanovskaya, 198504 St. Petersburg, Russia
PMC Physics A 2009, 3:1 doi:10.1186/1754-0410-3-1Published: 8 January 2009
The generalized Weinberg sum rules containing the difference of isovector vector and axial-vector spectral functions saturated by both finite and infinite number of narrow resonances are considered. We give a historical survey and summarize the status of these sum rules analyzing their overall agreement with phenomenological Lagrangians, low-energy relations, parity doubling, hadron string models, and experimental data.
PACS codes: 11.55.Hx, 11.30.Rd