Quasifree photoproduction of η mesons off protons and neutrons

被引：53

作者：

Werthmueller, D. ^{[1
]}

Witthauer, L. ^{[1
]}

Keshelashvili, I. ^{[1
]}

Aguar-Bartolome, P. ^{[2
]}

Ahrens, J. ^{[2
]}

Annand, J. R. M. ^{[3
]}

Arends, H. J. ^{[2
]}

Bantawa, K. ^{[4
]}

Beck, R. ^{[2
,5
]}

Bekrenev, V. ^{[6
]}

Braghieri, A. ^{[7
]}

Branford, D. ^{[8
]}

Briscoe, W. J. ^{[9
]}

Brudvik, J. ^{[10
]}

Cherepnya, S. ^{[11
]}

Costanza, S. ^{[7
]}

Demissie, B. ^{[9
]}

Dieterle, M. ^{[1
]}

Downie, E. J. ^{[2
,3
,9
]}

Drexler, P. ^{[12
]}

Fil'kov, L. V. ^{[11
]}

Fix, A. ^{[13
]}

Glazier, D. I. ^{[8
]}

Hamilton, D. ^{[3
]}

Heid, E. ^{[2
]}

Hornidge, D. ^{[14
]}

Howdle, D. ^{[3
]}

Huber, G. M. ^{[15
]}

Jaegle, I. ^{[1
]}

Jahn, O. ^{[2
]}

Jude, T. C. ^{[8
]}

Kaeser, A. ^{[1
]}

Kashevarov, V. L. ^{[2
,11
]}

Kondratiev, R. ^{[16
]}

Korolija, M. ^{[17
]}

Kruglov, S. P. ^{[6
]}

Krusche, B. ^{[1
]}

Kulbardis, A. ^{[6
]}

Lisin, V. ^{[16
]}

Livingston, K. ^{[3
]}

MacGregor, I. J. D. ^{[3
]}

Maghrbi, Y. ^{[1
]}

Mancell, J. ^{[3
]}

Manley, D. M. ^{[4
]}

Marinides, Z. ^{[9
]}

Martinez, M. ^{[2
]}

McGeorge, J. C. ^{[3
]}

McNicoll, E. F. ^{[3
]}

Metag, V. ^{[12
]}

Middleton, D. G. ^{[14
]}

机构：

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

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

[3] Univ Glasgow, Sch Phys & Astron, SUPA, Glasgow G12 8QQ, Lanark, Scotland

[4] Kent State Univ, Kent, OH 44242 USA

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

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

[7] Ist Nazl Fis Nucl, Sez Pavia, I-27100 Pavia, Italy

[8] Univ Edinburgh, Sch Phys, SUPA, Edinburgh EH9 3JZ, Midlothian, Scotland

[9] George Washington Univ, Washington, DC 20052 USA

[10] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

[11] Lebedev Phys Inst, Moscow 119991, Russia

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

[13] Tomsk Polytech Univ, Phys Math Lab, Tomsk 634050, Russia

[14] Mt Allison Univ, Sackville, NB E4L 1E6, Canada

[15] Univ Regina, Regina, SK S4S 0A2, Canada

[16] Inst Nucl Res, Moscow 125047, Russia

[17] Rudjer Boskovic Inst, HR-10000 Zagreb, Croatia

[18] Catholic Univ Amer, Washington, DC 20064 USA

来源：

PHYSICAL REVIEW C | 2014年 / 90卷 / 01期

基金：

英国科学技术设施理事会; 加拿大自然科学与工程研究理事会;

关键词：

NEAR-THRESHOLD PHOTOPRODUCTION; TAGGED PHOTON SPECTROMETER; EXCLUSIVE MEASUREMENT; BARYON RESONANCES; NARROW STRUCTURE; BEAM ASYMMETRY; ELECTROPRODUCTION; DEUTERON; DESIGN;

D O I：

10.1103/PhysRevC.90.015205

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：

Differential and total cross sections for the quasifree reactions gamma p -> eta p and gamma n -> eta n have been determined at the MAMI-C electron accelerator by using a liquid deuterium target. Photons were produced via bremsstrahlung from the 1.5 GeV incident electron beam and energy tagged with the Glasgow photon tagger. Decay photons of the neutral decay modes eta -> 2 gamma and eta -> 3 pi(0) -> 6 gamma and coincident recoil nucleons were detected in a combined setup of the Crystal Ball and the TAPS calorimeters. The eta-production cross sections were measured in coincidence with recoil protons, recoil neutrons, and in an inclusive mode without a condition on recoil nucleons, which allowed a check of the internal consistency of the data. The effects from nuclear Fermi motion were removed by a kinematic reconstruction of the final-state invariant mass and possible nuclear effects on the quasifree cross section were investigated by a comparison of free and quasifree-proton data. The results, which represent a significant improvement in statistical quality compared to previous measurements, agree with the known neutron-to-proton cross-section ratio in the peak of the S-11(1535) resonance and confirm a peak in the neutron cross section, which is absent for the proton, at a center-of-mass energy W = (1670 +/- 5) MeV with an intrinsic width of Gamma approximate to 30 MeV.

引用

页数：21

共 50 条

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