New Measurement of the π0 [pi superscript 0] Radiative Decay Width
High precision measurements of the differential cross sections for π0 [pi superscript 0] photoproduction at forward angles for two nuclei, 12C [superscript 12 C] and 208Pb [superscript 208 Pb], have been performed for incident photon energies of 4.9–5.5 GeV to extract the π0→γγ [pi superscript 0 → g...
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2011
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| Online Access: | http://hdl.handle.net/1721.1/66123 https://orcid.org/0000-0003-3088-6060 https://orcid.org/0000-0002-5665-3081 |
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| author | McNulty, Daniel D. Prok, Yelena Bernstein, Aron M. Kingsberry, P. Kowalski, Stanley B. |
| author2 | Lincoln Laboratory |
| author_facet | Lincoln Laboratory McNulty, Daniel D. Prok, Yelena Bernstein, Aron M. Kingsberry, P. Kowalski, Stanley B. |
| author_sort | McNulty, Daniel D. |
| collection | MIT |
| description | High precision measurements of the differential cross sections for π0 [pi superscript 0] photoproduction at forward angles for two nuclei, 12C [superscript 12 C] and 208Pb [superscript 208 Pb], have been performed for incident photon energies of 4.9–5.5 GeV to extract the π0→γγ [pi superscript 0 → gamma gamma] decay width. The experiment was done at Jefferson Lab using the Hall B photon tagger and a high-resolution multichannel calorimeter. The π0→γγ [pi superscript 0 → gamma gamma] decay width was extracted by fitting the measured cross sections using recently updated theoretical models for the process. The resulting value for the decay width is Γ(π0→γγ)[Gamma (pi superscript 0 → gamma gamma)] =7.82±0.14(stat)±0.17(syst) eV. With the 2.8% total uncertainty, this result is a factor of 2.5 more precise than the current Particle Data Group average of this fundamental quantity, and it is consistent with current theoretical predictions. |
| first_indexed | 2024-09-23T12:41:09Z |
| format | Article |
| id | mit-1721.1/66123 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:41:09Z |
| publishDate | 2011 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/661232022-10-01T10:29:49Z New Measurement of the π0 [pi superscript 0] Radiative Decay Width McNulty, Daniel D. Prok, Yelena Bernstein, Aron M. Kingsberry, P. Kowalski, Stanley B. Lincoln Laboratory Massachusetts Institute of Technology. Department of Physics Kowalski, Stanley B. McNulty, Daniel D. Prok, Yelena Bernstein, Aron M. Kingsberry, P. Kowalski, Stanley B. High precision measurements of the differential cross sections for π0 [pi superscript 0] photoproduction at forward angles for two nuclei, 12C [superscript 12 C] and 208Pb [superscript 208 Pb], have been performed for incident photon energies of 4.9–5.5 GeV to extract the π0→γγ [pi superscript 0 → gamma gamma] decay width. The experiment was done at Jefferson Lab using the Hall B photon tagger and a high-resolution multichannel calorimeter. The π0→γγ [pi superscript 0 → gamma gamma] decay width was extracted by fitting the measured cross sections using recently updated theoretical models for the process. The resulting value for the decay width is Γ(π0→γγ)[Gamma (pi superscript 0 → gamma gamma)] =7.82±0.14(stat)±0.17(syst) eV. With the 2.8% total uncertainty, this result is a factor of 2.5 more precise than the current Particle Data Group average of this fundamental quantity, and it is consistent with current theoretical predictions. National Science Foundation (U.S.) (Major Research Instrumentation Grant PHY-0079840) United States. Dept. of Energy (Contract no. DE-AC05-84ER40150) 2011-09-29T22:15:37Z 2011-09-29T22:15:37Z 2011-04 2010-09 Article http://purl.org/eprint/type/JournalArticle 0031-9007 http://hdl.handle.net/1721.1/66123 Larin, I. et al. “New Measurement of the π^{0} Radiative Decay Width.” Physical Review Letters 106, 162303 (2011): n. pag. © 2011 American Physical Society https://orcid.org/0000-0003-3088-6060 https://orcid.org/0000-0002-5665-3081 en_US http://dx.doi.org/10.1103/PhysRevLett.106.162303 Physical review letters 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 | McNulty, Daniel D. Prok, Yelena Bernstein, Aron M. Kingsberry, P. Kowalski, Stanley B. New Measurement of the π0 [pi superscript 0] Radiative Decay Width |
| title | New Measurement of the π0 [pi superscript 0] Radiative Decay Width |
| title_full | New Measurement of the π0 [pi superscript 0] Radiative Decay Width |
| title_fullStr | New Measurement of the π0 [pi superscript 0] Radiative Decay Width |
| title_full_unstemmed | New Measurement of the π0 [pi superscript 0] Radiative Decay Width |
| title_short | New Measurement of the π0 [pi superscript 0] Radiative Decay Width |
| title_sort | new measurement of the π0 pi superscript 0 radiative decay width |
| url | http://hdl.handle.net/1721.1/66123 https://orcid.org/0000-0003-3088-6060 https://orcid.org/0000-0002-5665-3081 |
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