Partonic structure of pi and rho mesons from data on hard (semi)exclusive production of two pions off nucleon

Details Partonic structure of pi and rho mesons from data on hard (semi)exclusive production of two pions off nucleon Partonic structure of pi and rho mesons from data on hard (semi)exclusive production of two pions off nucleon

2000-01-31

arxiv.org/abs/hep-ph/0001332v2

Nucl.Phys. A679 (2000) 185-195

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, two figures. References and discussion are added

Scientific paper

10.1016/S0375-9474(00)00337-7

We fitted the pi-pi mass distribution in the range 0.5 < mpipi < 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 rho meson distribution amplitudes. We obtain, for the first time, a measurement of the second Gegenbauer coefficient of the rho meson distribution amplitude: $a_2^{(\rho)}= -0.10\pm 0.20 $ for a photon virtuality of =21.2 GeV^2.

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