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The European Physical Journal A

, Volume 32, Issue 3, pp 273–291 | Cite as

Exclusive electroproduction of pion pairs

  • N. Warkentin
  • M. Diehl
  • D. Yu. Ivanov
  • A. Schäfer
Regular Article - Hadron Physics

Abstract.

We investigate electroproduction of pion pairs on the nucleon in the framework of QCD factorization for hard exclusive processes. We extend previous analyses by taking the hard-scattering coefficients at next-to-leading order in αs . The dynamics of the produced pion pair is described by two-pion distribution amplitudes, for which we perform a detailed theoretical and phenomenological analysis. In particular, we obtain constraints on these quantities by comparing our results with measurements of angular observables that are sensitive to the interference between two-pion production in the isoscalar and isovector channels.

PACS.

12.38.-t Quantum chromodynamics 12.38.Bx Perturbative calculations 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2007

Authors and Affiliations

  • N. Warkentin
    • 1
  • M. Diehl
    • 2
  • D. Yu. Ivanov
    • 3
  • A. Schäfer
    • 1
  1. 1.Institut für Theoretische PhysikUniversität RegensburgRegensburgGermany
  2. 2.Deutsches Elektronen-Synchrotron DESYHamburgGermany
  3. 3.Sobolev Institute of MathematicsNovosibirskRussia

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