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New Measurement of the pi(0) Radiative Decay Width
PrimEx Collaboration
2011
发表期刊PHYSICAL REVIEW LETTERS
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.
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
学科领域Physics
DOI10.1103/PhysRevLett.106.162303
收录类别SCI
语种英语
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000290096400009
引用统计
被引频次:43[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/213040
专题实验物理中心
作者单位中国科学院高能物理研究所
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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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