Exclusive electroproduction of pion pairs |
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Authors: | N Warkentin M Diehl D Yu Ivanov A Schäfer |
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Institution: | 1.Institut für Theoretische Physik,Universit?t Regensburg,Regensburg,Germany;2.Deutsches Elektronen-Synchrotron DESY,Hamburg,Germany;3.Sobolev Institute of Mathematics,Novosibirsk,Russia |
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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. |
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Keywords: | 12 38 -t Quantum chromodynamics 12 38 Bx Perturbative calculations |
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