PCAC anomalies and π0 photoproductionphotoproduction

A. Casher, L. Gomberoff

Research output: Contribution to journalArticlepeer-review


The Adler anomaly is applied to π0 photoproduction at threshold in the framework of a quark-vector gluon model. The anomalous contributions may account for the possible discrepancy between the predicted and measured values of the M multipoles. With a «reasonable» quark-gluon coupling constant the data favour a three-tripletquark model (as is the case for π0→2γ). The range and errors of the existing theoretical analyses prevent firm conclusions from being drawn. The effect may serve as a sensitive test for the validity of the vectorgluon model.

Original languageEnglish
Pages (from-to)598-604
Number of pages7
JournalLa Rivista del Nuovo Cimento
Issue number4
StatePublished - Aug 1973


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