QCD Sum Rule: Form factors and wave functions
Conference
·
OSTI ID:756471
The shape of hadronic distribution amplitudes (DAs) is a critical issue for the perturbative QCD of hard exclusive processes. Recent CLEO data on {gamma}{gamma}{sup *} {r_arrow} {pi}{sup 0} form factor clearly favor a pion DA close to the asymptotic form. The author argues that QCD sum rules for the moments of the pion DA {var_phi}{sub {pi}}(x) are unreliable, so that the humpy shape of {var_phi}{sub {pi}}(x) obtained by Chernyak and Zhitnitsky is a result of model assumptions rather than an unambiguous consequence of QCD sum rules. This conclusion is also supported by a direct QCD sum rule calculation of the {gamma}{gamma}{sup *} {r_arrow} {pi}{sup 0} form factor which gives a result very close to the CLEO 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:
- 756471
- Report Number(s):
- DOE/ER/40150-1565; JLAB-THY-97-29; hep-ph/9707335
- Country of Publication:
- United States
- Language:
- English
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