γ*γ → π(η, η′) transition form factors

被引：16
|
作者：
Melikhov, Dmitri [1 ,2 ,3 ]
Stech, Berthold [4 ]
机构：
[1] Austrian Acad Sci, HEPHY, A-1050 Vienna, Austria
[2] Univ Vienna, Fac Phys, A-1090 Vienna, Austria
[3] Moscow MV Lomonosov State Univ, SINP, Moscow 119991, Russia
[4] Heidelberg Univ, ITP, D-69120 Heidelberg, Germany
来源：
PHYSICAL REVIEW D | 2012年 / 85卷 / 05期
基金：
奥地利科学基金会;
关键词：
PSEUDOSCALAR MESONS; PHOTON;
D O I：
10.1103/PhysRevD.85.051901
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The surprising results by the BABAR Collaboration on the pi gamma transition form factor require new thoughts about the high-Q(2) dependence of the form factors with virtual photons. We make use of the anomaly sum rule [J. Horejsi and O. Teryaev, Z. Phys. C 65, 691 (1995).] which relates the hadron spectral density to the axial anomaly [S. Adler, Phys. Rev. 177, 2426 (1969); J. S. Bell and R. Jackiw, Nuovo Cimento A 60, 47 (1969).]. We study the quark-hadron duality relation for this sum rule and find out that the increase of the rescaled form factor Q(2)F(pi gamma)(Q(2)) similar to log(Q(2)) suggested by the BABAR data requires the presence of a 1/s-correction term in the relation between the one-loop spectral density and the hadron-continuum spectral density.
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页数：4
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