REMARKS AND RIGOROUS BOUNDS RELATING TO THE DECAY Z → πγ AND ITS RELATIONSHIP TO THE ANOMALY
- 30 October 1990
- journal article
- Published by World Scientific Pub Co Pte Ltd in Modern Physics Letters A
- Vol. 5 (27) , 2281-2287
- https://doi.org/10.1142/s0217732390002614
Abstract
It is rigorously shown that the amplitude for the decay Z → πγ must fall at least as fast as . Consequently its branching ratio must be smaller than 10−4; with slightly less conservative assumptions, this limit reduces to 5 × 10−6. The anomaly, the triangle graph and the Ward identities are shown to be consistent with both these bounds and the rate for π0 → 2γ.Keywords
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