EPJ Web Conf.
Volume 218, 2019The 11th International Workshop on e+e− Collisions from Phi to Psi (PhiPsi 2017)
|Number of page(s)||7|
|Section||Hadronic Cross Section Measurements in e+e− Annihilations|
|Published online||18 October 2019|
Direct, Resonant Production of States with Positive Charge Conjugation in Electron-Positron Annihilation
Institute of Physics, University of Silesia, PL-40007 Katowice, Poland
2 Institutfür Theoretische Teilchenphysik, KarlsruheInstitute of Technology , D-76128 Karlsruhe, Germany
* Work supported in part by the Polish National Science Centre, grant number DEC-2012/07/B/ST2/03867 and German Research Foundation DFG under Contract No. Collaborative Research Center CRC-1044.
Published online: 18 October 2019
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 and thus negligeable for all practical purpose. The importance of the relative phase of the production amplitude is emphasized.
© The Authors, published by EDP Sciences, 2019
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