Measurement of the Beam-Helicity asymmetry in the p((e)over-right-arrow,e′p)π0 reaction at the energy of the Δ(1232) resonance -: art. no. 142001

被引：48

作者：

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

机构：

[1] Univ Zagreb, Dept Phys, Zagreb 41000, Croatia

[2] Joint Inst Nucl Res Dubna, Theoret Phys Lab, Dubna, Russia

[3] Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany

[4] Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany

[5] Univ Ljubljana, Jozef Stefan Inst, SI-1001 Ljubljana, Slovenia

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 88卷 / 14期

关键词：

D O I：

10.1103/PhysRevLett.88.142001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：4

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