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Two-loop form factors for pseudo-scalar quarkonium production and decay
We present the analytic expressions for the two-loop form factors for the production or decay of pseudo-scalar quarkonia, in a scheme where the quarks are produced at threshold. We consider the two-loop amplitude for the process $ \gamma \gamma \leftrightarrow {}^1{S}_0^{\left[1\right]} $, that was...
| Autores principales: | , , , |
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| Lenguaje: | eng |
| Publicado: |
2022
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1007/JHEP02(2023)250 http://cds.cern.ch/record/2841206 |