Measurement of the beam-helicity asymmetry I⊙ in the photoproduction of π0-pairs off the proton and off the neutron

被引：25

作者：

Oberle, M. ^{[1
]}

Krusche, B. ^{[1
]}

Ahrens, J. ^{[2
]}

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

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

Bantawa, K. ^{[4
]}

Bartolome, P. A. ^{[2
]}

Beck, R. ^{[5
]}

Bekrenev, V. ^{[6
]}

Berghaeuser, H. ^{[7
]}

Braghieri, A. ^{[8
]}

Branford, D. ^{[9
]}

Briscoe, W. J. ^{[10
]}

Brudvik, J. ^{[11
]}

Cherepnya, S. ^{[12
]}

Demissie, B. ^{[10
]}

Dieterle, M. ^{[1
]}

Downie, E. J. ^{[2
,3
,10
]}

Drexler, P. ^{[7
]}

Fil'kov, L. V. ^{[12
]}

Fix, A. ^{[13
]}

Glazier, D. I. ^{[9
]}

Heid, E. ^{[2
]}

Hornidge, D. ^{[14
]}

Howdle, D. ^{[3
]}

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

Jahn, O. ^{[2
]}

Jaegle, I. ^{[1
]}

Jude, T. C. ^{[9
]}

Kaeser, A. ^{[1
]}

Kashevarov, V. L. ^{[2
,12
]}

Keshelashvili, I. ^{[1
]}

Kondratiev, R. ^{[16
]}

Korolija, M. ^{[17
]}

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

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. ^{[10
]}

Martinez, M. ^{[2
]}

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

McNicoll, E. ^{[3
]}

Mekterovic, D. ^{[17
]}

Metag, V. ^{[7
]}

Micanovic, S. ^{[17
]}

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, 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, RU-188300 Gatchina, Russia

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

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

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

[10] George Washington Univ, Ctr Nucl Studies, Washington, DC 20052 USA

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

[12] PN Lebedev Phys Inst, RU-119991 Moscow, Russia

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

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

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

[16] Inst Nucl Res, RU-125047 Moscow, Russia

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

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

来源：

PHYSICS LETTERS B | 2013年 / 721卷 / 4-5期

基金：

加拿大自然科学与工程研究理事会; 英国科学技术设施理事会;

关键词：

DOUBLE-PION-PHOTOPRODUCTION; TOTAL CROSS-SECTION; DOUBLE PI(0) PHOTOPRODUCTION; TAGGED PHOTON SPECTROMETER; 2ND RESONANCE REGION; BARYON RESONANCES; PARTIAL-WAVE; MICROTRON; THRESHOLD; MAMI;

D O I：

10.1016/j.physletb.2013.03.021

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Beam-helicity asymmetries have been measured at the MAMI accelerator in Mainz for the photoproduction of neutral pion pairs in the reactions (gamma) over right arrowp -> p pi(0)pi(0) and (gamma) over right arrowd -> (n)p pi(0)pi(0), (gamma) over right arrowd -> (p)n pi(0)pi(0) off free protons and off quasi-free nucleons bound in the deuteron for incident photon energies up to 1.4 GeV. Circularly polarized photons were produced from bremsstrahlung of longitudinally polarized electrons and tagged with the Glasgow magnetic spectrometer. Decay photons from the pi(0) mesons, recoil protons, and recoil neutrons were detected in the 4 pi covering electromagnetic calorimeter composed of the Crystal Ball and TAPS detectors. After kinematic reconstruction of the final state, excellent agreement was found between the results for free and quasi-free protons. This demonstrates that the free-nucleon behavior of such observables can be extracted from measurements with quasi-free nucleons, which is the only possibility for the neutron. Contrary to expectations, the measured asymmetries are very similar for reactions off protons and neutrons. The results are compared to the predictions from the Two-Pion MAID reaction model and (for the proton) also to the Bonn-Gatchina coupled channel analysis. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：237 / 243

页数：7

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