Testing the PCAC prediction for the π0 lifetime |
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Authors: | Yoshihisa Kitazawa |
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Affiliation: | The Enrico Fermi Institute, University of Chicago, Chicago, IL 60637, USA |
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Abstract: | We compare the PCAC prediction based on the chiral anomaly for the π0 lifetime with a recent experiment. We find that the QED corrections are as large as 3%. After these corrections the experiment and the PCAC prediction disagree by 8.5 ± 2%. We estimate the corrections to the PCAC prediction. We find that reliably calculable corrections are not large enough to account for the discrepancy. However, contributions from the excited π0's may be able to explain the difference. |
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