First Measurement of the Helicity Asymmetry for γp → pπ0 in the Resonance Region

被引：49

作者：

Gottschall, M. ^{[1
]}

Anisovich, A. V. ^{[1
,5
]}

Bantes, B. ^{[2
]}

Bayadilov, D. ^{[1
,5
]}

Beck, R. ^{[1
]}

Bichow, M. ^{[6
]}

Boese, S. ^{[1
]}

Brinkmann, K. -Th. ^{[1
,3
]}

Challand, Th. ^{[4
]}

Crede, V. ^{[7
]}

Dietz, F. ^{[3
]}

Dutz, H. ^{[2
]}

Eberhardt, H. ^{[2
]}

Elsner, D. ^{[2
]}

Ewald, R. ^{[2
]}

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

Friedrich, St. ^{[3
]}

Frommberger, F. ^{[2
]}

Funke, Ch. ^{[1
]}

Gridnev, A. ^{[5
]}

Gruener, M. ^{[1
]}

Gutz, E. ^{[1
,3
]}

Hammann, Ch. ^{[1
]}

Hannappel, J. ^{[2
]}

Hartmann, J. ^{[1
]}

Hillert, W. ^{[2
]}

Hoffmeister, Ph. ^{[1
]}

Honisch, Ch. ^{[1
]}

Jaegle, I. ^{[4
]}

Kaiser, D. ^{[1
]}

Kalinowsky, H. ^{[1
]}

Kammer, S. ^{[2
]}

Keshelashvili, I. ^{[4
]}

Klein, F. ^{[2
]}

Klempt, E. ^{[1
]}

Koop, K. ^{[1
]}

Krusche, B. ^{[4
]}

Kube, M. ^{[1
]}

Lang, M. ^{[1
]}

Lopatin, I. ^{[5
]}

Maghrbi, Y. ^{[4
]}

Makonyi, K. ^{[3
]}

Metag, V. ^{[3
]}

Meyer, W. ^{[6
]}

Mueller, J. ^{[1
]}

Nanova, M. ^{[3
]}

Nikonov, V. ^{[1
,5
]}

Novotny, R. ^{[3
]}

Piontek, D. ^{[1
]}

Reicherz, G. ^{[6
]}

机构：

[1] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany

[2] Univ Bonn, Inst Phys, D-53115 Bonn, Germany

[3] Univ Giessen, Inst Phys 2, D-35392 Giessen, Germany

[4] Univ Basel, Dept Phys, CH-4056 Basel, Switzerland

[5] Petersburg Nucl Phys Inst, Gatchina 188300, Russia

[6] Ruhr Univ Bochum, Inst Expt Phys 1, D-44780 Bochum, Germany

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

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 01期

关键词：

HEARN SUM-RULE; PHOTOPRODUCTION; SPECTROMETER; DEPENDENCE; PHOTON; TARGET; ELSA;

D O I：

10.1103/PhysRevLett.112.012003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The first measurement of the helicity dependence of the photoproduction cross section of single neutral pions off protons is reported for photon energies from 600 to 2300 MeV, covering nearly the full solid angle. The data are compared to predictions from the SAID, MAID, and BnGa partial wave analyses. Strikingly large differences between data and predictions are observed, which are traced to differences in the helicity amplitudes of well-known and established resonances. Precise values for the helicity amplitudes of several resonances are reported.

引用

页数：5

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