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Oset, E. and Peláez Sagredo, José Ramón and Roca, L. (2003) Η → π⁰ ϒ ϒ decay within a chiral unitary approachη. Physical review D, 67 (7). ISSN 0556-2821
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Official URL: http://dx.doi.org/10.1103/PhysRevD.67.073013
Abstract
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.
Item Type: | Article |
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Additional Information: | ©2003 The American Physical Society. |
Uncontrolled Keywords: | 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 |
Subjects: | Sciences > Physics > Physics-Mathematical models Sciences > Physics > Mathematical physics |
ID Code: | 35548 |
Deposited On: | 05 Feb 2016 16:59 |
Last Modified: | 10 Dec 2018 15:09 |
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