Measurement of the decay distribution of eta-prime --> pi+ pi- pi- gamma and evidence for the box anomaly

The distribution of m ( π + π − ) in the decay η ′ → π + π − γ has been measured with the Crystal Barrel detector. The results are based on a total of 7392 observed η′ decays. The box anomaly constant is extracted from this and its value is found to agree well with theoretical expectations. The pseudoscalar nonet parameters ( f 1 , f 8 and θ PS ) are determined. Finally, we find that there is a problem of consistency between QCD and the standard VDM assumption.

anti-p p: annihilation
annihilation: anti-p p
eta(958): hadroproduction
hadroproduction: eta(958)
eta(958): radiative decay
radiative decay: eta(958)
mass spectrum: (pi+ pi- photon)
(pi+ pi- photon): mass spectrum
mass spectrum: (pi+ pi-)
(pi+ pi-): mass spectrum

References(24)

Figures(0)

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