Speaker
Xu Cao
(Institute of Modern Physics, CAS, Lanzhou)
Description
We give a parameterizztion of the anomalous line shape of resonances based on a Fano-type formula, which can be widely used to extract properties of resonances from data. We employ it to explain the anomalous line shape of the $e^+ e^- \to D \bar{D}$ and $e^+ e^- \to \Lambda \bar{\Lambda}$. In both reactions, a below-threshold state is found to play significant role in the measured cross sections.
Primary author
Xu Cao
(Institute of Modern Physics, CAS, Lanzhou)
