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Gauge-invariant Theory of Two-Pion Photo- and Electro-Production off the Nucleon

✍ Scribed by H. Haberzettl, K. Nakayama, Yongseok Oh

Book ID
120917548
Publisher
Springer Vienna
Year
2013
Tongue
English
Weight
309 KB
Volume
54
Category
Article
ISSN
0177-7963

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We fitted the ππ mass distribution in the range 0.5 M ππ 1.1 GeV measured in hard exclusive positron-proton reactions at HERA by the form dictated by QCD at leading-twist level. Extracted parameters are related to valence-quark distribution in the pion, and to the pion and ρ meson distribution ampli