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19 April 2024

» arxiv » nucl-ex/0112009

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Measurement of the beam-helicity asymmetry in the p(e_pol,e'p)pi_0 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 ; 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 ;
Date:	19 Dec 2001
Journal:	Phys.Rev.Lett. 88 (2002) 142001
Subject:	nucl-ex
Abstract:	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.
Source:	arXiv, nucl-ex/0112009
Other source:	[GID 1132578] nucl-ex/0112009
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