Double-polarization observable G in neutral-pion photoproduction off the proton

被引：12

作者：

Thiel, A. ^{[1
]}

Eberhardt, H. ^{[2
]}

Lang, M. ^{[1
]}

Afzal, F. ^{[1
]}

Anisovich, A. V. ^{[1
,3
]}

Bantes, B. ^{[2
]}

Bayadilov, D. ^{[1
,3
]}

Beck, R. ^{[1
]}

Bichow, M. ^{[4
]}

Brinkmann, K. -T. ^{[1
,7
]}

Boese, S. ^{[1
]}

Crede, V. ^{[6
]}

Dieterle, M. ^{[5
]}

Dutz, H. ^{[2
]}

Elsner, D. ^{[2
]}

Ewald, R. ^{[2
]}

Fornet-Ponse, K. ^{[2
]}

Friedrich, St. ^{[7
]}

Frommberger, F. ^{[2
]}

Funke, Ch. ^{[1
]}

Goertz, St. ^{[2
]}

Gottschall, M. ^{[1
]}

Gridnev, A. ^{[3
]}

Gruener, M. ^{[1
]}

Gutz, E. ^{[1
,7
]}

Hammann, D. ^{[2
]}

Hammann, Ch. ^{[1
]}

Hannappel, J. ^{[1
]}

Hartmann, J. ^{[1
]}

Hillert, W. ^{[2
]}

Hoffmeister, Ph. ^{[1
]}

Honisch, Ch. ^{[1
]}

Jude, T. ^{[2
]}

Kaiser, D. ^{[1
]}

Kalinowsky, H. ^{[1
]}

Kalischewski, F. ^{[1
]}

Kammer, S. ^{[2
]}

Keshelashvili, I. ^{[5
]}

Klassen, P. ^{[1
]}

Kleber, V. ^{[2
]}

Klein, F. ^{[2
]}

Klempt, E. ^{[1
]}

Koop, K. ^{[1
]}

Krusche, B. ^{[5
]}

Kube, M. ^{[1
]}

Lopatin, I. ^{[3
]}

Mahlberg, Ph. ^{[1
]}

Makonyi, K. ^{[7
]}

Metag, V. ^{[7
]}

Meyer, W. ^{[4
]}

机构：

[1] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, Bonn, Germany

[2] Univ Bonn, Phys Inst, Bonn, Germany

[3] Petersburg Nucl Phys Inst, Gatchina, Russia

[4] Ruhr Univ Bochum, Inst Expt Phys 1, Bochum, Germany

[5] Univ Basel, Inst Phys, Basel, Switzerland

[6] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA

[7] Univ Giessen, Inst Phys 2, Giessen, Germany

来源：

EUROPEAN PHYSICAL JOURNAL A | 2017年 / 53卷 / 01期

基金：

美国国家科学基金会; 俄罗斯基础研究基金会;

关键词：

REACTION GAMMA-P; PI(0) PHOTOPRODUCTION; QUARK-MODEL; ASYMMETRY; ELSA; MULTIPOLES; REGION; IMPACT; TARGET; BONN;

D O I：

10.1140/epja/i2017-12194-8

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

This paper reports on a measurement of the double-polarization observable G in pi(0) photoproduction off the proton using the CBELSA/TAPS experiment at the ELSA accelerator in Bonn. The observable G is determined from reactions of linearly polarized photons with longitudinally polarized protons. The polarized photons are produced by bremsstrahlung off a diamond radiator of well-defined orientation. A frozen spin butanol target provides the polarized protons. The data cover the photon energy range from 617 to 1325MeV and a wide angular range. The experimental results for G are compared to predictions by the Bonn-Gatchina (BnGa), Julich-Bonn (JuBo), MAID and SAID partial wave analyses. Implications of the new data for the pion photoproduction multipoles are discussed.

引用

页数：12

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