Η → π⁰ ϒ ϒ decay within a chiral unitary approachη
We improve the calculations of the η→π⁰ϒϒ decay within the context of meson chiral Lagrangians. We use a chiral unitary approach for the meson-meson interaction, thus generating the a₀(980) resonance and fixing the long standing sign ambiguity on its contribution. This also allows us to calculate th...
| Authors: | , , |
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| Format: | article |
| Publication Date: | 2003 |
| Country: | España |
| Institution: | Universidad Complutense de Madrid (UCM) |
| Repository: | Docta Complutense |
| Language: | English |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/51740 |
| Online Access: | https://hdl.handle.net/20.500.14352/51740 |
| Access Level: | Open access |
| Keyword: | 51-73 Photon-photon collisions Jona-lasinio model Perturbation-theory Radiative decay Njl model One-loop Meson ϒ-ϒ->π π₀ Symmetry η->π-0-ϒ-ϒ Física-Modelos matemáticos Física matemática |
| Summary: | We improve the calculations of the η→π⁰ϒϒ decay within the context of meson chiral Lagrangians. We use a chiral unitary approach for the meson-meson interaction, thus generating the a₀(980) resonance and fixing the long standing sign ambiguity on its contribution. This also allows us to calculate the loops with one vector meson exchange, thus removing a former source of uncertainty. In addition we ensure the consistency of the approach with other processes, first, by using vector meson dominance couplings normalized to agree with radiative vector meson decays and, second, by checking the consistency of the calculations with the related ϒ ϒ → π⁰η reaction. We find an η→π⁰ ϒϒ decay width of 0.47 ± 0.10 eV, in clear disagreement with published data but in remarkable agreement with the most recent measurement. |
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