3 papers
hep-ph2004
Analyticity and Resonance Sum Rules 1n Large Scatterings
Zhi-guang Xiao, Hanqing Zheng
This paper is withdrawn due to a mistake. The revised version with a new tiltle can be found in hep-ph/0502199.
hep-ph2003
How to parameterize a light and broad resonance (the meson)
Hanqing Zheng
We point out that a commonly used parameterization form to describe the resonance is problematic by introducing a spurious singularity below two particle threshold, on the seco…
hep-ph2001
The Use of Analyticity in the and Coupled Channel System
Zhiguang Xiao, Hanqing Zheng
Studies on the IJ=00 and coupled--channel system are made using newly derived dispersion relations between the phase shifts and poles and cuts. It is found that the…