The η(η') gamma transition form factor and the gluon-gluon distribution amplitude

被引：21
|
作者：
Kroll, P. [1 ,2 ]
Passek-Kumericki, K. [3 ]
机构：
[1] Univ Wuppertal, Fachbereich Phys, D-42097 Wuppertal, Germany
[2] Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany
[3] Rudjer Boskovic Inst, Div Theoret Phys, Zagreb, Croatia
来源：
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS | 2013年 / 40卷 / 07期
关键词：
PSEUDOSCALAR MESONS; EXCLUSIVE PROCESSES; SYMMETRY-BREAKING; FACTORIZATION; PHOTON; ANNIHILATION; EVOLUTION; DECAY;
D O I：
10.1088/0954-3899/40/7/075005
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
The eta gamma and eta'gamma transition form factors are analyzed to leading-twist accuracy and next-to-leading order of perturbative QCD. Using an eta-eta' mixing scheme and all currently available experimental data the lowest Gegenbauer coefficients of the distribution amplitudes for the valence octet and singlet q (q) over bar and the gluon-gluon Fock components are extracted. Predictions for the g*g*eta' vertex function are presented. We also comment on the new BELLE results for the pi gamma transition form factor.
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页数：17
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