Direct, resonant production of states with positive charge conjugation in electron-positron annihilation

• DOI: 10.48550/arxiv.1710.08161
• Publication Date: 2019-01-01
• Authors: Czyż, Henryk; Kühn, Johann H.; Tracz, Szymon
• Keywords: High Energy Physics - Phenomenology; High Energy Physics - Phenomenology (hep-ph); electron-positron annihilation; Physics; QC1-999; 0103 physical sciences; FOS: Physical sciences; hadronic cross; 01 natural sciences

Recent theory results on direct production of resonances with positive charge conjugationin electron-positron annihilation are reviewed. The strong modeldependence is emphasized, with predictions varying between 0.03 eV and 0.43 eV for the charmonium state with JPC = 1++ and between0.16 eV and4.25 eV for the state with JPC =2++. For the state with JPC = 0++ the cross section is of O $ \left( {\mathop m\nolimits_e^2 /\mathop M\nolimits_x^2 } \right) $ and thus negligeable for all practical purpose. The importance of the relative phase of the production amplitude is emphasized.