Neutral pion threshold production at Q^2=0.05 GeV^2/c^2 and Chiral Perturbation Theory

Details Neutral pion threshold production at Q^2=0.05 GeV^2/c^2 and Chiral Perturbation Theory Neutral pion threshold production at Q^2=0.05 GeV^2/c^2 and Chiral Perturbation Theory

2001-08-20

arxiv.org/abs/nucl-ex/0108020v2

Phys.Rev.Lett. 88 (2002) 012301

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 3 Postscript figures, latex2e, v2 minor changes

Scientific paper

10.1103/PhysRevLett.88.012301

New data are presented on the p(e,e'p)\pi^0 reaction at threshold at a four-momentum transfer of Q^2=0.05 GeV^2/c^2. The data were taken with the three-spectrometer setup of the A1 Collaboration at the Mainz Microtron MAMI. The complete center of mass solid angle was covered up to a center of mass energy of 4 MeV above threshold. Combined with measurements at three different values of the virtual photon polarization \epsilon, the structure functions \sigma_T, \sigma_L, \sigma_{TT}, and \sigma_{TL} are determined. The results are compared with calculations in Heavy Baryon Chiral Perturbation Theory and with a phenomenological model. The measured cross section is significantly smaller than both predictions.

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