Transverse momentum and Sudakov effects in exclusive QCD processes: {gamma}{sup *}{gamma}{pi}{sup 0} form factor

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The authors analyze effects due to transverse degrees of freedom in QCD calculations of the fundamental hard exclusive amplitude of {gamma}{sup *}{gamma}{r_arrow}{pi}{sup 0} transition. A detailed discussion is given of the relation between the modified factorization approach (MFA) of Sterman et al. and standard factorization (SFA). Working in Feynman gauge, they construct basic building blocks of MFA from the one-loop coefficient function of the SFA, demonstrating that Sudakov effects are distinctly different from higher-twist corrections. They show also that the handbag-type diagram, contrary to naive expectations, does not contain an infinite chain of (M{sup 2}/Q{sup 2}){sup n} corrections: they come ... continued below

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2946 Kilobytes pages

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Musatov, I. February 1, 1997.

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The authors analyze effects due to transverse degrees of freedom in QCD calculations of the fundamental hard exclusive amplitude of {gamma}{sup *}{gamma}{r_arrow}{pi}{sup 0} transition. A detailed discussion is given of the relation between the modified factorization approach (MFA) of Sterman et al. and standard factorization (SFA). Working in Feynman gauge, they construct basic building blocks of MFA from the one-loop coefficient function of the SFA, demonstrating that Sudakov effects are distinctly different from higher-twist corrections. They show also that the handbag-type diagram, contrary to naive expectations, does not contain an infinite chain of (M{sup 2}/Q{sup 2}){sup n} corrections: they come only from diagrams with transverse gluons emitted from the hard propagator. A simpler picture emerges within the QCD sum rule approach: the sum over soft {anti q}G ... Gq Fock components is dual to {anti q}q states generated by the local axial current. They combine the results based on QCD sum rules with pQCD radiative correct ions and observe that the gap between their curves for the asymptotic and CZ distribution amplitudes is sufficiently large for an experimental discrimination between them.

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2946 Kilobytes pages

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  • Journal Name: Phys.Rev. D56 (1997) 2713-2735; Journal Volume: D; Journal Issue: 56; Other Information: Submitted to Phys.Rev. D56 (1997) 2713-2735

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  • Report No.: DOE/ER/40150-1544
  • Report No.: JLAB-THY-97-07
  • Report No.: hep-ph/9702443
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 756283
  • Archival Resource Key: ark:/67531/metadc702743

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  • February 1, 1997

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  • Sept. 12, 2015, 6:31 a.m.

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  • Feb. 5, 2016, 8:41 p.m.

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Musatov, I. Transverse momentum and Sudakov effects in exclusive QCD processes: {gamma}{sup *}{gamma}{pi}{sup 0} form factor, article, February 1, 1997; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc702743/: accessed November 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.