Axial-current divergences and the reactions gamma gamma ---> pions
Mar, 19714 pages
Published in:
- Phys.Rev.Lett. 26 (1971) 591-594
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Abstract: (APS)
A symmetry argument is presented that gives a relation between the small-momentum limits of the reactions γ+γ→ odd number of pions, as calculated explicitly from a single nucleon (or quark) loop in a theory with a formally conserved axial-vector current. These limits are nonvanishing as a consequence of the Adler anomalies in the divergence of the axial-vector current. It is argued that the relationship derived should be true in any chiral model. The cross section for γ+γ→π++π−+π0 is calculated in terms of the measured π0→2γ decay rate.- photon photon: interaction
- interaction: photon photon
- final state
- pi+: pi-: pi0
- pi: multiple production
- multiple production: pi
- model: conserved a-v current
- pi0: radiative decay
- radiative decay: pi0
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