Measurement of polarization observables T, P, and H in π0and η photoproduction off quasi-free nucleons

被引：0

作者：

Jermann, N. ^{[1
,2
]}

Krusche, B. ^{[1
]}

Metag, V. ^{[3
]}

Afzal, F. ^{[2
]}

Badea, M. ^{[2
]}

Beck, R. ^{[2
]}

Bielefeldt, P. ^{[2
]}

Bieling, J. ^{[2
]}

Biroth, M. ^{[4
]}

Blanke, E. ^{[2
]}

Borisov, N. ^{[5
]}

Bornstein, M. ^{[7
]}

Brinkmann, K. -t. ^{[3
]}

Ciupka, S. ^{[2
]}

Crede, V. ^{[6
]}

Dolzhikov, A. ^{[5
]}

Drexler, P. ^{[4
]}

Dutz, H. ^{[7
]}

Elsner, D. ^{[7
]}

Fedorov, A. ^{[5
]}

Frommberger, F. ^{[7
]}

Gardner, S. ^{[8
]}

Ghosal, D. ^{[1
,10
]}

Goertz, S. ^{[7
]}

Gorodnov, I. ^{[5
]}

Gruener, M. ^{[2
]}

Hammann, C. ^{[2
]}

Hartmann, J. ^{[2
]}

Hillert, W. ^{[7
,11
]}

Hoffmeister, P. ^{[2
]}

Honisch, C. ^{[2
]}

Jude, T. C. ^{[7
]}

Kalischewski, F. ^{[2
]}

Ketzer, B. ^{[2
]}

Klassen, P. ^{[2
]}

Klein, F. ^{[7
]}

Klempt, E. ^{[2
]}

Knaust, J. ^{[2
]}

Kolanus, N. ^{[2
]}

Kreit, J. ^{[2
]}

Kroenert, P. ^{[2
]}

Lang, M. ^{[2
]}

Lazarev, A. B. ^{[5
]}

Livingston, K. ^{[8
]}

Lutterer, S. ^{[1
,12
]}

Mahlberg, P. ^{[2
]}

Meier, C. ^{[1
]}

Meyer, W. ^{[9
]}

Mitlasoczki, B. ^{[2
]}

Muellers, J. ^{[2
]}

机构：

[1] Univ Basel, Dept Phys, Basel, Switzerland

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

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

[4] Johannes Gutenberg Univ Mainz, Inst Kernphys, Mainz, Germany

[5] Joint Inst Nucl Res Dubna, Dubna, Russia

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

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

[8] Univ Glasgow, SUPA Sch Phys & Astron, Glasgow, Scotland

[9] Ruhr Univ Bochum, Inst Experimentalphys 1, Bochum, Germany

[10] Univ Liverpool, Liverpool, England

[11] Univ Hamburg, Hamburg, Germany

[12] Ruhr Univ Bochum, Bochum, Germany

来源：

EUROPEAN PHYSICAL JOURNAL A | 2023年 / 59卷 / 10期

关键词：

ISOBAR MODEL; GAMMA-P; RESONANCE; WAVE; ELECTROPRODUCTION; SPECTROMETER; DETECTORS; ASYMMETRY; DEUTERON; MESONS;

D O I：

10.1140/epja/s10050-023-01134-0

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：

The target asymmetry T, recoil asymmetry P,and beam-target double polarization observable H were determined in exclusive pi(0)and eta photoproduction off quasi-free protons and, for the first time, off quasi-free neutrons.The experiment was performed at the electron stretcher accelerator ELSA in Bonn, Germany, with the Crystal Bar-rel/TAPS detector setup, using a linearly polarized photonbeam and a transversely polarized deuterated butanol target.Effects from the Fermi motion of the nucleons within deuterium were removed by a full kinematic reconstruction of the final state invariant mass. A comparison of the data obtained on the proton and on the neutron provides new insight into the isospin structure of the electromagnetic excitation of the nucleon. Earlier measurements of polarization observables in the gamma p -> pi(0) p and gamma p -> eta preactions are confirmed.The data obtained on the neutron are of particular relevance for clarifying the origin of the narrow structure in the eta n system at W=1.68 GeV. A comparison with recent partial wave analyses favors the interpretation of this structure as arising from interference of the S-11(1535) and S-11 (1650) resonances within the S-11-partial wave.

引用

页数：13

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