Chiral Anomaly Tests

1994/09/14 by M. A. Moinester, Moinester, Murray A. · 1 citation
Physics and Astronomy · Computer Science · #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Computational Physics and Python Applications

paper · pdf · doi:10.48550/arxiv.hep-ph/9409307

Abstract

For the gamma-pion interaction, the perturbative expansion of the effective chiral Lagrangian (chi-PT) can be limited to terms quartic in momenta and masses (O(p4)), or to higher order. The abnormal intrinsic parity (chiral anomaly) component of the lagrangian leads to interesting predictions for the processes pi0 -----> 2 gamma and gamma ----->3 pi. These are described by the amplitudes F_pi and F_3pi, respectively. We demonstrate that the O(p4) value of F_3pi disagrees with existing data, while the O(p6) value is nearly consistent. We describe how Fermilab experiment E781 can get improved data for tests of the chiral anomaly.

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