Measurement of the Beam-Helicity asymmetry in the p((e)over- right-arrow,e ' p)pi(0) reaction at the energy of the Delta(1232) resonance

Bartsch, P. et al. (2002) Measurement of the Beam-Helicity asymmetry in the p((e)over- right-arrow,e ' p)pi(0) reaction at the energy of the Delta(1232) resonance. Physical Review Letters, 88(14), art 142001. (doi:10.1103/PhysRevLett.88.142001)

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Publisher's URL: http://dx.doi.org/10.1103/PhysRevLett.88.142001

Abstract

In a p((e) over right arrow, 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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Rosner, Professor Guenther
Authors: Bartsch, P., Baumann, D., Bermuth, J., Bohm, R., Bohinc, K., Bosnar, D., Ding, M., Distler, M., Drechsel, D., Elsner, D., Ewald, I., Friedrich, J., Friedrich, J.M., Grozinger, S., Hedicke, S., Jennewein, P., Kahrau, M., Kamalov, S.S., Klein, F., Krygier, K.W., Liesenfeld, A., Merkel, H., Merle, P., Muller, U., Neuhausen, R., Pospischil, T., Potokar, M., Rosner, G., Schmieden, H., Seimetz, M., Sule, A., Tiator, L., 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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