$η\to π^0 γγ$ decay within a chiral unitary approach revisited

Details $η\to π^0 γγ$ decay within a chiral unitary approach revisited $η\to π^0 γγ$ decay within a chiral unitary approach revisited

2008-01-17

arxiv.org/abs/0801.2633v1

Phys.Rev.D77:073001,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

10.1103/PhysRevD.77.073001

In view of the recent experimental developments on the experimental side in the $\eta \to \pi^0 \gamma \gamma$ decay, and the fact that the Particle Data Group in the on line edition of 2007 reports sizable changes of the radiative decay widths of vector mesons used as input in the theoretical calculations of \cite{eta}, a reevaluation of the decay width of the $\eta$ in this channel has been done, reducing its uncertainty by almost a factor of two. The new input of the PDG is used and invariant mass distributions and total widths are compared with the most recent results from AGS, MAMI and preliminary ones of KLOE. The agreement of the theory with the AGS and MAMI data is very good, both for the total rates as well as for the invariant mass distributions of the two photons.

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