https://doi.org/10.1140/epja/i2007-10374-9
Regular Article - Hadron Physics
Exclusive electroproduction of pion pairs
1
Institut für Theoretische Physik, Universität Regensburg, 93040, Regensburg, Germany
2
Deutsches Elektronen-Synchrotron DESY, 22603, Hamburg, Germany
3
Sobolev Institute of Mathematics, 630090, Novosibirsk, Russia
Received:
24
April
2007
Accepted:
12
May
2007
Published online:
8
June
2007
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 –
© Società Italiana di Fisica and Springer-Verlag, 2007