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η→π^(0)γ γ decay within a chiral unitary approach revisited

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Oset, E. and Peláez Sagredo, José Ramón and Roca, L. (2008) η→π^(0)γ γ decay within a chiral unitary approach revisited. Physical review D, 77 (7). ISSN 1550-7998

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Official URL: http://dx.doi.org/10.1103/PhysRevD.77.073001


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Abstract

In view of the recent experimental developments in η→π^(0)γ γ decay, and the fact that the Particle Data Group in the online edition of 2007 reports sizable changes of the radiative decay widths of vector mesons used as input in the theoretical calculations of E. Oset, J. R. Peláez, and L. Roca [Phys. Rev. D 67, 073013 (2003)], a reevaluation of the decay width of the in this channel has been done, reducing its uncertainty by almost a factor of 2. The new input of the Particle Data Group is used, and invariant mass distributions and total widths are compared with the most recent results from the AGS and MAMI experiments, and preliminary ones of KLOE. The agreement of the theory with the AGS and MAMI data is very good, both for the total rates and for the invariant mass distributions of the two photons.


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©2008 The American Physical Society.
This work is partly supported by DGICYT Contract No. FIS2006-03438, and the Generalitat Valenciana. This research is part of the EU Integrated Infrastructure Initiative HADRON PHYSICS PROJECT under Contract No. RII3-CT-2004-506078. J. R. P.’s research is partially funded by Spanish CICYT Contract No. FPA2007-29115-E, No. FIS2006-03438, No. FPA2005-02327, No. UCMCAM 910309, as well as Banco Santander/Complutense Contract No. PR27/05-13955-BSCH. L. R. acknowledges further support from Fundación Séneca Grant No. 02975/PI/05 and CICYT Contract No. FPA2004-03470 and No. FPA2007-62777.

Uncontrolled Keywords:Jona-lasinio model; Perturbation-theory; Njl model; ɲ->π(0)γ - γ; γ - γ ->π(0) π(0); Meson; ɲ -> π -0- γ - γ
Subjects:Sciences > Physics > Physics-Mathematical models
Sciences > Physics > Mathematical physics
ID Code:35223
Deposited On:26 Jan 2016 15:49
Last Modified:10 Dec 2018 15:09

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