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16–21 Aug 2019
Guilin Bravo Hotel, Guilin, China
Asia/Shanghai timezone

Line shape of states in electron–positron annihilation and the role of below-threshold resonance

20 Aug 2019, 11:50
20m
Duxiu Room (Guilin Bravo Hotel, Guilin, China)

Duxiu Room

Guilin Bravo Hotel, Guilin, China

14 South Ronghu Road, Xiangshan, Guilin 541002, Guangxi, China
Parallel Session 4: Hadron decays, production and interactions Session 4: Hadron decays, production and interactions

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)

Presentation materials