Power corrections to the process gammagamma^*rightarrow pipi in the light-cone sum rules approach |
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| Authors: | N. Kivel L. Mankiewicz |
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| Affiliation: | (1) Institut für Theoretische Physik und Astrophysik, Julius-Maximilians-Universität Würzburg, 97074 Würzburg, Germany;(2) Institut für Physik, Johannes-Gutenberg Universität Mainz, 55099 Mainz, Germany; |
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| Abstract: | We applied QCD light-cone sum rules to estimate power corrections to the helicity-conserving amplitude in the process . We found that above GeV power corrections are numerically small and the twist-2 part dominates.The amplitude can be reliably calculated in this region using models of distribution amplitudes as input. We found that the magnitude of the NLO corrections depends rather strongly on the normalization of the gluonic distribution amplitude. |
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