| New Measurement of the pi(0) Radiative Decay Width |
| PrimEx Collaboration
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| 2011
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发表期刊 | PHYSICAL REVIEW LETTERS
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卷号 | 106期号:16 |
通讯作者 | Gasparian, A (reprint author), N Carolina A&T State Univ Greensboro, Greensboro, NC 27411 USA.
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摘要 | High precision measurements of the differential cross sections for pi(0) photoproduction at forward angles for two nuclei, C-12 and Pb-208, have been performed for incident photon energies of 4.9-5.5 GeV to extract the pi(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 pi(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 Gamma(pi(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. |
关键词 | NEUTRAL PION
LIFETIME
NUCLEI
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学科领域 | Physics
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DOI | 10.1103/PhysRevLett.106.162303
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收录类别 | SCI
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语种 | 英语
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WOS类目 | Physics, Multidisciplinary
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WOS记录号 | WOS:000290096400009
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引用统计 |
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文献类型 | 期刊论文
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条目标识符 | http://ir.ihep.ac.cn/handle/311005/213040
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专题 | 实验物理中心
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作者单位 | 中国科学院高能物理研究所
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推荐引用方式 GB/T 7714 |
PrimEx Collaboration. New Measurement of the pi(0) Radiative Decay Width[J]. PHYSICAL REVIEW LETTERS,2011,106(16).
|
APA |
PrimEx Collaboration.(2011).New Measurement of the pi(0) Radiative Decay Width.PHYSICAL REVIEW LETTERS,106(16).
|
MLA |
PrimEx Collaboration."New Measurement of the pi(0) Radiative Decay Width".PHYSICAL REVIEW LETTERS 106.16(2011).
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