Quasi-free photoproduction of η-mesons off the deuteron

被引：68

作者：

Jaegle, I. ^{[1
]}

Krusche, B. ^{[1
]}

Anisovich, A. V. ^{[2
,3
]}

Bacelar, J. C. S. ^{[4
]}

Bantes, B. ^{[5
]}

Bartholomy, O. ^{[2
]}

Bayadilov, D. E. ^{[2
,3
]}

Beck, R. ^{[2
]}

Beloglazov, Y. A. ^{[3
]}

Castelijns, R. ^{[4
]}

Crede, V. ^{[6
]}

Dieterle, M. ^{[1
]}

Dutz, H. ^{[5
]}

Elsner, D. ^{[5
]}

Ewald, R. ^{[5
]}

Frommberger, F. ^{[5
]}

Funke, C. ^{[2
]}

Gothe, R. ^{[5
]}

Gregor, R. ^{[7
]}

Gridnev, A. B. ^{[3
]}

Gutz, E. ^{[2
]}

Hillert, W. ^{[5
]}

Hoeffgen, S. ^{[5
]}

Hoffmeister, P. ^{[2
]}

Horn, I. ^{[2
]}

Junkersfeld, J. ^{[2
]}

Kalinowsky, H. ^{[2
]}

Kammer, S. ^{[5
]}

Keshelashvili, I. ^{[1
]}

Kleber, V. ^{[5
]}

Klein, Frank ^{[5
]}

Klein, Friedrich ^{[5
]}

Klempt, E. ^{[2
]}

Konrad, M. ^{[5
]}

Kotulla, M. ^{[1
]}

Lang, M. ^{[2
]}

Lohner, H. ^{[4
]}

Lopatin, I. V. ^{[3
]}

Lugert, S. ^{[7
]}

Maghrbi, Y. ^{[1
]}

Menze, D. ^{[5
]}

Mertens, T. ^{[1
]}

Messchendorp, J. G. ^{[4
]}

Metag, V. ^{[7
]}

Nikonov, V. A. ^{[2
,3
]}

Nanova, M. ^{[7
]}

Novinski, D. V. ^{[2
,3
]}

Novotny, R. ^{[7
]}

Oberle, M. ^{[1
]}

Ostrick, M. ^{[5
]}

机构：

[1] Univ Basel, Dept Phys, CH-4003 Basel, Switzerland

[2] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-5300 Bonn, Germany

[3] Petersburg Nucl Phys Inst, Gatchina, Russia

[4] Univ Groningen, KVI, NL-9700 AB Groningen, Netherlands

[5] Univ Bonn, Inst Phys, D-5300 Bonn, Germany

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

[7] Univ Giessen, Inst Phys 2, D-35390 Giessen, Germany

来源：

EUROPEAN PHYSICAL JOURNAL A | 2011年 / 47卷 / 08期

关键词：

NEAR-THRESHOLD PHOTOPRODUCTION; POLARIZED PHOTON BEAMS; EXCLUSIVE MEASUREMENT; NUCLEON RESONANCE; BARYON RESONANCES; CHIRAL DYNAMICS; PROTON; ASYMMETRY; REGION; ELSA;

D O I：

10.1140/epja/i2011-11089-0

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：

Precise data for quasi-free photoproduction of eta-mesons off the deuteron have been measured at the Bonn ELSA accelerator with the combined Crystal Barrel/TAPS detector for incident photon energies up to 2.5 GeV. The eta-mesons have been detected in coincidence with recoil protons and neutrons. Possible nuclear effects like Fermi motion and re-scattering can be studied via a comparison of the quasi-free reaction off the bound proton to eta-production off the free proton. No significant effects beyond the folding of the free cross-section with the momentum distribution of the bound protons have been found. These Fermi motion effects can be removed by an analysis using the invariant mass of the eta-nucleon pairs reconstructed from the final-state four-momenta of the particles. The total cross-section for quasi-free eta-photoproduction off the neutron reveals even without correction for Fermi motion a pronounced bump-like structure around 1 GeV of incident photon energy, which is not observed for the proton. This structure is even narrower in the invariant-mass spectrum of the.-neutron pairs. Position and width of the peak in the invariant-mass spectrum are W approximate to 1665MeV and FWHM Gamma approximate to 25MeV. The data are compared to the results of different models.

引用

页码：1 / 25

页数：25

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