With vector-meson effects included, the WZW anomalous coupling extracted from eta-prime to pi+ pi- gamma matches theory and implies a box-anomaly branching fraction about an order of magnitude larger than the published value.
Measurement of the Branching Ratio and Form Factors for the Decay \boldmath $K_L\to\pi^{\pm}\pi^0e^{\mp}\nu_e(\bar\nu_e)
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abstract
The $K_L\to\pi^{\pm}\pi^0e^{\mp}\nu_e(\bar\nu_e)$ decay was investigated with the NA48 detector at CERN SPS using a beam of long-lived neutral kaons. The branching ratio $Br(K_L\to\pi^{\pm}\pi^0e^{\mp}\nu_e(\bar\nu_e))=(5.21\pm 0.07_{stat}\pm 0.09_{syst})\times 10^{-5}$ was fixed from a sample of 5464 events with 62 background events. The form factors $\bar{f}_s$, $\bar{f}_p$, $\lambda_g$ and $\bar{h}$ were found to be in agreement with previous measurements but with higher accuracy. The coupling parameter of the chiral Lagrangian $L_3=(-4.1\pm 0.2)\times 10^{-3}$ was evaluated from the data.
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Identify hadron anomalous couplings at colliders
With vector-meson effects included, the WZW anomalous coupling extracted from eta-prime to pi+ pi- gamma matches theory and implies a box-anomaly branching fraction about an order of magnitude larger than the published value.