Form-factor of the process gamma* gamma* ---> pi0 for small virtuality of one of the photons and QCD sum rules
Conference
·
OSTI ID:840185
We extend the QCD sum rule analysis of the F{sub {gamma}*{gamma}* {yields} {pi}{sup o}} (q{sub 1}{sup 2}, q{sub 2}{sup 2}) form factor into the region where one of the photons has small virtuality: |q{sub 1}{sup 2}| << |q{sub 2}{sup 2}| {ge} 1 GeV{sup 2}. In this kinematics, one should perform an additional factorization of short- and long-distance contributions. The extra long-distance sensitivity of the three-point amplitude is described by two-point correlators (bilocals), and the low-momentum dependence of the correlators involving composite operators of two lowest twists is extracted from auxiliary QCD sum rules. Our estimates for the form factor at q{sub 1}{sup 2}=0, Q{sub 2}{sup 2} > 1 GeV{sup 2} are in good agreement with existing experimental data.
- Research Organization:
- Thomas Jefferson National Accelerator Facility, Newport News, VA (US)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 840185
- Report Number(s):
- CEBAF-TH-95-24; DOE/ER/40150-3400; hep-ph/9507447
- Country of Publication:
- United States
- Language:
- English
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