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Determination of the eta and eta
Huang, Tao; Wu, Xing-Gang; Huang, T , Chinese Acad Sci, Inst High Energy Phys, POB 918,4, Beijing 100039, Peoples R China
2007
发表期刊EUROPEAN PHYSICAL JOURNAL C
ISSN1434-6044
卷号50期号:4页码:771-779
摘要The possible range of the eta-eta' mixing angle is determined from the transition form factors F-eta gamma(Q(2)) and F-eta'gamma (Q(2)) with the help of up-to-date experimental data. For this purpose, the quark-flavor mixing scheme is adopted and the pseudoscalar transition form factors are calculated in the framework of light-cone pQCD, in which the transverse-momentum corrections and the contributions beyond the leading Fock state have been carefully taken into consideration. We construct a phenomenological expression to estimate the contributions to the form factors beyond the leading Fock state, based on their asymptotic behavior at Q(2) -> 0 and Q(2) -> infinity. By taking the quark-flavor mixing scheme, our results lead to phi = 38.0 degrees +/- 1.0 degrees +/- 2.0 degrees, where the first error comes from the experimental uncertainty and the second error from the uncertainties of the parameters of the wavefunction. The possible intrinsic charm component in eta and eta' is discussed, and our present analysis also disfavors a large intrinsic charm component in eta and eta', e.g. vertical bar f(eta')(c)vertical bar <= 50 MeV.
部门归属Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; Chongqing Univ, Dept Phys, Chongqing 400044, Peoples R China
关键词Quantum Chromodynamics Symmetry-breaking Decay Constants Mesons
学科领域Physics
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收录类别SCI
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/5737
专题理论物理所1978-2010年知识产出
通讯作者Huang, T , Chinese Acad Sci, Inst High Energy Phys, POB 918,4, Beijing 100039, Peoples R China
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GB/T 7714
Huang, Tao,Wu, Xing-Gang,Huang, T , Chinese Acad Sci, Inst High Energy Phys, POB 918,4, Beijing 100039, Peoples R China. Determination of the eta and eta[J]. EUROPEAN PHYSICAL JOURNAL C,2007,50(4):771-779.
APA Huang, Tao,Wu, Xing-Gang,&Huang, T , Chinese Acad Sci, Inst High Energy Phys, POB 918,4, Beijing 100039, Peoples R China.(2007).Determination of the eta and eta.EUROPEAN PHYSICAL JOURNAL C,50(4),771-779.
MLA Huang, Tao,et al."Determination of the eta and eta".EUROPEAN PHYSICAL JOURNAL C 50.4(2007):771-779.
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