Neutral pion lifetime measurements and the QCD chiral anomaly
Name
Bernstein-2013-Neutral pion lifetime measurements and the QCD chiral anomaly.pdf
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1.48 MB
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Adobe PDF
Checksum (MD5)
ee593b208eb904c7a2ec1626512fe292
Author(s)
Bernstein, Aron M.
Holstein, Barry R.
Date Issued
January 2013
Journal
Reviews of Modern Physics
Publisher
American Physical Society
Citation
Bernstein, A. M., and Barry R. Holstein 2013Neutral Pion Lifetime Measurements and the QCD Chiral Anomaly. Reviews of Modern Physics 85(1): 49–77. © 2013 American Physical Society
Version
Final published version
Abstract
A fundamental property of QCD is the presence of the chiral anomaly, which is the dominant component of the π[superscript 0]→γγ decay rate. Based on this anomaly and its small (≃4.5%) chiral correction, a prediction of the π[superscript 0] lifetime can be used as a test of QCD at confinement scale energies. The interesting experimental and theoretical histories of the π[superscript 0] meson are reviewed, from discovery to the present era. Experimental results are in agreement with the theoretical prediction, within the current (≃3%) experimental error; however, they are not yet sufficiently precise to test the chiral corrected result, which is a firm QCD prediction and is known to ≃1% uncertainty. At this level there exist experimental inconsistencies, which require attention. Possible future work to improve the present precision is suggested.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/RevModPhys.85.49
