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Discussion of the eta to pi^0 gamma gamma decay within a chiral unitary approach

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Discussion of the eta to pi^0 gamma gamma decay within a chiral unitary approach

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dc.contributor.author Oset Báguena, Eulogio
dc.contributor.author Peláez Sagredo, José Ramón
dc.contributor.author Roca Zamora, Luis
dc.date.accessioned 2015-09-08T07:11:09Z
dc.date.available 2015-09-08T07:11:09Z
dc.date.issued 2006
dc.identifier.citation Oset Báguena, Eulogio Peláez Sagredo, José Ramón Roca Zamora, Luis 2006 Discussion of the eta to pi^0 gamma gamma decay within a chiral unitary approach Acta Physica Slovaca 56 3 327 333
dc.identifier.uri http://hdl.handle.net/10550/46927
dc.description.abstract We improve the calculations of the $\eta \to \pi^0 \gamma \gamma$ decay within the context of meson chiral lagrangians. We use a chiral unitary approach for the meson-meson interaction, thus generating the $a_0(980)$ resonance and fixing the longstanding 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 $\gamma \gamma \to \pi^0 \eta$ reaction. We find an $\eta \to \pi^0 \gamma \gamma$ decay width of $0.47\pm 0.10$ eV, in clear disagreement with published data but in remarkable agreement with the most recent measurement.
dc.language.iso eng
dc.relation.ispartof Acta Physica Slovaca, 2006, vol. 56, num. 3, p. 327-333
dc.subject Física
dc.title Discussion of the eta to pi^0 gamma gamma decay within a chiral unitary approach
dc.type journal article es_ES
dc.date.updated 2015-09-08T07:11:09Z
dc.identifier.idgrec 079374
dc.rights.accessRights open access es_ES

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