Neutral pion threshold production at Q2=0.05 GeV2/c2 and chiral perturbation theory

Merkel, H. et al. (2002) Neutral pion threshold production at Q2=0.05 GeV2/c2 and chiral perturbation theory. Physical Review Letters, 88(1), art 012301. (doi: 10.1103/PhysRevLett.88.012301)

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Publisher's URL: http://dx.doi.org/10.1103/PhysRevLett.88.012301

Abstract

New data are presented on the p (e, e'p)pi(o) reaction at threshold at a four-momentum transfer of Q<sup>2</sup>=0.05 GeV<sup>2</sup>/c<sup>2</sup> The data were taken with the three-spectrometer setup of the A1 Collaboration at the Mainz Microtron MAML 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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Rosner, Professor Guenther
Authors: Merkel, H., Bartsch, P., Baumann, D., Bermuth, J., Bernstein, A.M., Bohinc, K., Bohm, R., Clawiter, N., Derber, S., Ding, M., Distler, M.O., Ewald, I., Friedrich, J.M., Friedrich, J., Jennewein, P., Kahrau, M., Kohl, M., Krygier, K.W., Kuss, M., Liesenfeld, A., Merle, P., Miskimen, R.A., Muller, U., Neuhausen, R., Pavan, M.M., Pospischil, T., Potokar, M., Rosner, G., Schmieden, H., Seimetz, M., Sircar, S., Wagner, A., Walcher, T., and Weis, M.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN:0031-9007
ISSN (Online):1079-7114

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