Neutral-pion electroproduction on the proton near threshold
- van den Brink, H. B.
- Blok, H. P.
- Bobeldijk, I.
- Bouwhuis, M.
- Dodge, G. E.
- Harakeh, M. N.
- Hesselink, W. H. A.
- Ireland, D. G.
- de Jager, C. W.
- Jans, E.
- de Jonge, N.
- Kalantar-Nayestanaki, N.
- Kasdorp, W-J.
- Ketel, T. J.
- Konijn, J.
- Lapikás, L.
- van Leeuwe, J. J.
- van der Meer, R. L. J.
- Nooren, G. J. L.
- Norum, B. E.
- Passchier, E.
- Pellegrino, A. R.
- Spaltro, C. M.
- van der Steenhoven, G.
- Steijger, J. J. M.
- Templon, J. A.
- Theunissen, J. A. P.
- van Uden, M. A.
- de Vries, H.
- de Vries, R.
- de Witt Huberts, P. K. A.
DOIAbstract
The double-differential coincidence cross section for the reaction 1 H ( e , e ′ p ) π 0 has been measured at Q 2 = 0.1 ( GeV / c ) 2 in a range in the invariant mass of 2–14 MeV above threshold. From the angular dependence of the data values of the pion s -wave multipoles E 0 + and L 0 + have been extracted. The results are compared to predictions from chiral perturbation theory and models based on an effective Lagrangian. None of the models is able to describe both the E 0 + and the L 0 + multipoles
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