Anomalous decays of eta' and eta into four pions

Details Anomalous decays of eta' and eta into four pions Anomalous decays of eta' and eta into four pions

2011-11-25

arxiv.org/abs/1111.5949v2

Phys.Rev.D85:014014,2012

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 5 figures; references updated, version published in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.85.014014

We calculate the branching ratios of the yet unmeasured eta' decays into four pions, based on a combination of chiral perturbation theory and vector-meson dominance. The decays eta' --> 2(pi+ pi-) and eta' --> pi+ pi- 2pi0 are P-wave dominated and can largely be thought to proceed via two rho resonances; we predict branching fractions of (1.0+-0.3)*10^-4 and (2.4+-0.7)*10^-4, respectively, not much lower than the current experimental upper limits. The decays eta' --> 4pi0 and eta --> 4pi0, in contrast, are D-wave driven as long as conservation of CP symmetry is assumed, and are significantly further suppressed; any experimental evidence for the decay eta --> 4pi0 could almost certainly be interpreted as a signal of CP violation. We also calculate the CP-violating amplitudes for eta' --> 4pi0 and eta --> 4pi0 induced by the QCD theta-term.

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