Electromagnetic annihilation of e+e− into quarkonium states with even charge conjugation |
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Authors: | Johann H Kühn Jean Kaplan El Ghali Oudrhiri Safiani |
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Institution: | Max-Planck-Institut für Physik und Astrophysik, Munich, Fed. Rep. of Germany;LPTHE Paris VI and VII, Tour 33, 1 er étage, 2. Place Jussieu, F-75221 Paris - Cedex 05, France |
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Abstract: | We calculate the production of narrow resonances with even charge conjugation in e+e? annihilation in the quarkonium and vectordominance models. We give unitarity bounds for in terms of and . The electromagnetic production dominates through the neutral current at low energies independent of details of the model. For masses above 10 GeV the situation is reversed. |
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