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Measurement of the beam-helicity asymmetry in the p(e_pol,e'p)pi₀ reaction at the energy of the Delta(1232) resonance

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arxiv nucl-ex/0112009 v1 pith:J74QMIQD submitted 2001-12-18 nucl-ex

Measurement of the beam-helicity asymmetry in the p(e_pol,e'p)pi₀ reaction at the energy of the Delta(1232) resonance

P. Bartsch , D. Baumann , J. Bermuth , R. Boehm , K. Bohinc , D. Bosnar , M. Ding , M. Distler
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D. Drechsel D. Elsner I. Ewald J. Friedrich J.M. Friedrich S. Groezinger S. Hedicke P. Jennewein M. Kahrau S.S. Kamalov F. Klein K.W. Krygier A. Liesenfeld H. Merkel P. Merle U. Mueller R. Neuhausen Th. Pospischil M. Potokar G. Rosner H. Schmieden M. Seimetz A. Suele L. Tiator A. Wagner Th. Walcher M. Weis
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keywords asymmetrybeam-helicitydeltaenergyresonancearoundbackgroundbeen
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In a p(e_pol,e'p)pi_0 out-of-plane coincidence experiment at the 3-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 lack of understanding of the non-resonant background, which in dynamical models is related to the pion cloud.

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