Exclusive photon-photon processes

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Exclusive gamma gamma right arrow hadron pairs are among the most fundamental processes in QCD, providing a detailed examination of Compton scattering in the crossed channel. In the high momentum transfer domain (s, t, large, Theta cm for t/s fixed), these processes can be computed from first principles in QCD, yielding important information on the nature of the QCD coupling data and the form of hadron distribution amplitudes. Similarly, the transition form factors gamma star gamma, gamma star gamma right arrow pi(o), Eta (0), Eta`, Eta(c)... provide rigorous tests of QCD and definitive determinations of the meson distribution amplitudes Phi ... continued below

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17 p.

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Brodsky, S.J. July 1, 1997.

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Description

Exclusive gamma gamma right arrow hadron pairs are among the most fundamental processes in QCD, providing a detailed examination of Compton scattering in the crossed channel. In the high momentum transfer domain (s, t, large, Theta cm for t/s fixed), these processes can be computed from first principles in QCD, yielding important information on the nature of the QCD coupling data and the form of hadron distribution amplitudes. Similarly, the transition form factors gamma star gamma, gamma star gamma right arrow pi(o), Eta (0), Eta`, Eta(c)... provide rigorous tests of QCD and definitive determinations of the meson distribution amplitudes Phi H(x,Q). We show that the assumption of a frozen coupling at low momentum transfers can explain the observed scaling of two-photon exclusive processes.

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17 p.

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OSTI as DE97009057

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  • Photon `97, Egmond aan Zee (Netherlands), 10-15 May 1997

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  • Other: DE97009057
  • Report No.: SLAC-PUB--7604
  • Report No.: CONF-9705136--
  • Grant Number: AC03-76SF00515
  • Office of Scientific & Technical Information Report Number: 621773
  • Archival Resource Key: ark:/67531/metadc692402

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Office of Scientific & Technical Information Technical Reports

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  • July 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Aug. 9, 2016, 12:30 p.m.

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Brodsky, S.J. Exclusive photon-photon processes, article, July 1, 1997; California. (digital.library.unt.edu/ark:/67531/metadc692402/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.