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Bartsch P, Baumann D, Bermuth J, et al. Measurement of the beam-helicity asymmetry in the p((-->)e,e'p)pi(0) reaction at the energy of the Delta(1232) resonance. Phys Rev Lett. 2002;88(14):142001doi: 10.1103/PhysRevLett.88.142001.
Bartsch, P., Baumann, D., Bermuth, J., Böhm, R., Bohinc, K., Bosnar, D., Ding, M., Distler, M., Drechsel, D., Elsner, D., Ewald, I., Friedrich, J., Friedrich, J. M., Grözinger, S., Hedicke, S., Jennewein, P., Kahrau, M., Kamalov, S. S., Klein, F., Krygier, K. W., Liesenfeld, A., Merkel, H., Merle, P., Müller, U., Neuhausen, R., Pospischil, T., Potokar, M., Rosner, G., Schmieden, H., Seimetz, M., Süle, A., Tiator, L., Wagner, A., Walcher, T., & Weis, M. (2002). Measurement of the beam-helicity asymmetry in the p((-->)e,e'p)pi(0) reaction at the energy of the Delta(1232) resonance. Physical review letters, 88(14), 142001. https://doi.org/10.1103/PhysRevLett.88.142001
Bartsch, P, et al. "Measurement of the beam-helicity asymmetry in the p((-->)e,e'p)pi(0) reaction at the energy of the Delta(1232) resonance." Physical review letters vol. 88,14 (2002): 142001. doi: https://doi.org/10.1103/PhysRevLett.88.142001
Bartsch P, Baumann D, Bermuth J, Böhm R, Bohinc K, Bosnar D, Ding M, Distler M, Drechsel D, Elsner D, Ewald I, Friedrich J, Friedrich JM, Grözinger S, Hedicke S, Jennewein P, Kahrau M, Kamalov SS, Klein F, Krygier KW, Liesenfeld A, Merkel H, Merle P, Müller U, Neuhausen R, Pospischil T, Potokar M, Rosner G, Schmieden H, Seimetz M, Süle A, Tiator L, Wagner A, Walcher T, Weis M. Measurement of the beam-helicity asymmetry in the p((-->)e,e'p)pi(0) reaction at the energy of the Delta(1232) resonance. Phys Rev Lett. 2002 Apr 08;88(14):142001. doi: 10.1103/PhysRevLett.88.142001. Epub 2002 Mar 26. PMID: 11955140.
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Phys Rev Lett. 2002 Apr 08;88(14):142001. doi: 10.1103/PhysRevLett.88.142001. Epub 2002 Mar 26.

Measurement of the beam-helicity asymmetry in the p((-->)e,e'p)pi(0) reaction at the energy of the Delta(1232) resonance.

Physical review letters

P Bartsch, D Baumann, J Bermuth, R Böhm, K Bohinc, D Bosnar, M Ding, M Distler, D Drechsel, D Elsner, I Ewald, J Friedrich, J M Friedrich, S Grözinger, S Hedicke, P Jennewein, M Kahrau, S S Kamalov, F Klein, K W Krygier, A Liesenfeld, H Merkel, P Merle, U Müller, R Neuhausen, Th Pospischil, M Potokar, G Rosner, H Schmieden, M Seimetz, A Süle, L Tiator, A Wagner, Th Walcher, M Weis

Affiliations

  1. Institut für Kernphysik, Universität Mainz, D-55099 Mainz, Germany.

PMID: 11955140 DOI: 10.1103/PhysRevLett.88.142001

Abstract

In a p((-->)e,e'p)pi(0) out-of-plane coincidence experiment at the three-spectrometer setup of the Mainz Microtron MAMI, the beam-helicity asymmetry has been precisely measured around the energy of the Delta(1232) resonance and Q(2) = 0.2(GeV/c)(2). The results are in disagreement with three up-to-date model calculations. This is interpreted as a lack of understanding of the nonresonant background, which in dynamical models is related to the pion cloud.

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