Form factor of the process {gamma}{sup *}{gamma}{sup *} {r_arrow} {phi}{sup O} at small virtuality of one of the photons and QCD sum rules (II)
Journal Article
·
· Physics of Atomic Nuclei
OSTI ID:183372
- Joint Inst. for Nuclear Research, Moscow (Russian Federation)
QCD sum rules for the form factor F{sub {gamma}*{gamma}*{r_arrow}{pi}{sup 0}}(q{sup 2}{sub 1}, q{sup 2}{sub 2}) are generalized to the region where one of the photons has a small virtuality {vert_bar}q{sup 2}{sub 1}{vert_bar}{much_lt}{vert_bar}q{sup 2}{sub 2}{vert_bar}{ge} 1 GeV{sup 2}. In this range of momentum transfer, additional factorization of short- and long-distance contributions must be performed. The long-distance contribution to the three-point amplitude is factorized into two-point (bilocal) correlation functions of the electromagnetic current and the composite operators of the two lowest twists. The low-energy dependence of the correlation functions is determined from auxiliary QCD sum rules. The sum rule obtained for the form factor is regular in the limit q{sup 2}{sub 1} {r_arrow} 0. The authors estimates for F{sub {gamma}{sup *}}{sub {gamma}{sup *}{r_arrow} {pi}{sup O}} (q{sup 2}{sub 1}=O,q{sup 2}{sub 2}) are in good agreement with available experimental data. 22 refs., 3 figs.
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 183372
- Journal Information:
- Physics of Atomic Nuclei, Journal Name: Physics of Atomic Nuclei Journal Issue: 8 Vol. 58; ISSN 1063-7788; ISSN PANUEO
- Country of Publication:
- United States
- Language:
- English
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