New Measurement of the pi(0) Radiative Decay Width

doi:10.1103/PhysRevLett.106.162303

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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
DOI	10.1103/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：45[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
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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