QCD Sum Rule: Form factors and wave functions

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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 ... continued below

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210 Kilobytes pages

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Radyushkin, A.V. July 1, 1997.

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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.

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210 Kilobytes pages

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  • Conference on Perspectives in Hadronic Physics, Trieste (IT), 05/12/1997--05/16/1997

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  • Report No.: DOE/ER/40150-1565
  • Report No.: JLAB-THY-97-29
  • Report No.: hep-ph/9707335
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 756471
  • Archival Resource Key: ark:/67531/metadc710453

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • July 1, 1997

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  • Sept. 12, 2015, 6:31 a.m.

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  • Feb. 5, 2016, 9:39 p.m.

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Radyushkin, A.V. QCD Sum Rule: Form factors and wave functions, article, July 1, 1997; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc710453/: accessed April 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.