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Two-photon widths of the chi(c0,2) states and helicity analysis for chi(c2) -> gamma gamma
BESIII Collaboration
2012
发表期刊PHYSICAL REVIEW D
卷号85期号:11页码:112008
摘要Based on a data sample of 106 X 10(6) psi' events collected with the BESIII detector, the decays psi' -> gamma chi(c0,2), chi(c0,2) -> gamma gamma are studied to determine the two-photon widths of the chi(c0,2) states. The two-photon decay branching fractions are determined to be B(chi(c0) -> gamma gamma) = (2.24 +/- 0.19 +/- 0.12 +/- 0.08) X 10(-4) and B(chi(c2) -> gamma gamma) = (3.21 +/- 0.18 +/- 0.17 +/- 0.13) X 10(-4) From these, the two-photon widths are determined to be Gamma(gamma gamma)(chi(c0)) = (2.33 +/- 0.20 +/- 0.13 +/- 0.17) keV, Gamma(gamma gamma)(chi(c2)) = (0.63 +/- 0.04 +/- 0.04 +/- 0.04) keV, and R = Gamma(gamma gamma)(chi(c2))/Gamma(gamma gamma)(chi(c0)) = 0.271 +/- 0.029 +/- 0.013 +/- 0.027, where the uncertainties are statistical, systematic, and those from the PDG B(psi' -> gamma chi(c0,2)) and Gamma(chi(c0,2)) errors, respectively. The ratio of the two-photon widths for helicity lambda = 0 and helicity lambda = 2 components in the decay chi -> gamma gamma is measured for the first time to be f(0/2) = Gamma(lambda=0)(gamma gamma)(chi(c2))/Gamma(lambda=2)(gamma gamma)(chi(c2)) = 0.00 +/- 0.02 +/- 0.02.
学科领域Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.85.112008
收录类别SCI
WOS记录号WOS:000305560500001
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被引频次:10[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/311005/224618
专题实验物理中心
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BESIII Collaboration. Two-photon widths of the chi(c0,2) states and helicity analysis for chi(c2) -> gamma gamma[J]. PHYSICAL REVIEW D,2012,85(11):112008.
APA BESIII Collaboration.(2012).Two-photon widths of the chi(c0,2) states and helicity analysis for chi(c2) -> gamma gamma.PHYSICAL REVIEW D,85(11),112008.
MLA BESIII Collaboration."Two-photon widths of the chi(c0,2) states and helicity analysis for chi(c2) -> gamma gamma".PHYSICAL REVIEW D 85.11(2012):112008.
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