Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-03-14
Eur.Phys.J.A32:273-291,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
Scientific paper
10.1140/epja/i2007-10374-9
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 $\alpha_s$. 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.
Diehl Markus
Ivanov Dmitri Yu.
Sch{ä}fer Andreas
Warkentin Nikolaus
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