Neutral pion lifetime measurements and the QCD chiral anomaly
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 e...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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American Physical Society
2013
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| Online Access: | http://hdl.handle.net/1721.1/78883 https://orcid.org/0000-0002-5665-3081 |
| _version_ | 1826201302000992256 |
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| author | Bernstein, Aron M. Holstein, Barry R. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Bernstein, Aron M. Holstein, Barry R. |
| author_sort | Bernstein, Aron M. |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T11:49:48Z |
| format | Article |
| id | mit-1721.1/78883 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T11:49:48Z |
| publishDate | 2013 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/788832022-10-01T06:17:45Z Neutral pion lifetime measurements and the QCD chiral anomaly Bernstein, Aron M. Holstein, Barry R. Massachusetts Institute of Technology. Department of Physics Bernstein, Aron M. 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. United States. Dept. of Energy 2013-05-14T16:57:39Z 2013-05-14T16:57:39Z 2013-01 2011-11 Article http://purl.org/eprint/type/JournalArticle 0034-6861 1539-0756 http://hdl.handle.net/1721.1/78883 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 https://orcid.org/0000-0002-5665-3081 en_US http://dx.doi.org/10.1103/RevModPhys.85.49 Reviews of Modern Physics 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. application/pdf American Physical Society APS |
| spellingShingle | Bernstein, Aron M. Holstein, Barry R. Neutral pion lifetime measurements and the QCD chiral anomaly |
| title | Neutral pion lifetime measurements and the QCD chiral anomaly |
| title_full | Neutral pion lifetime measurements and the QCD chiral anomaly |
| title_fullStr | Neutral pion lifetime measurements and the QCD chiral anomaly |
| title_full_unstemmed | Neutral pion lifetime measurements and the QCD chiral anomaly |
| title_short | Neutral pion lifetime measurements and the QCD chiral anomaly |
| title_sort | neutral pion lifetime measurements and the qcd chiral anomaly |
| url | http://hdl.handle.net/1721.1/78883 https://orcid.org/0000-0002-5665-3081 |
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