Photoproduction of π0π0- and π0π+-pairs off the proton from threshold to the second resonance region

被引：36

作者：

Zehr, F. ^{[1
]}

Krusche, B. ^{[1
]}

Aguar, P. ^{[2
]}

Ahrens, J. ^{[2
]}

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

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

Beck, R. ^{[2
,4
]}

Bekrenev, V. ^{[5
]}

Boillat, B. ^{[1
]}

Braghieri, A. ^{[6
]}

Branford, D. ^{[7
]}

Briscoe, W. J. ^{[8
]}

Brudvik, J. ^{[9
]}

Cherepnya, S. ^{[10
]}

Codling, R. F. B. ^{[3
]}

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

Drexler, P. ^{[12
]}

Glazier, D. I. ^{[7
]}

Fil'kov, L. V. ^{[10
]}

Fix, A. ^{[11
]}

Gregor, R. ^{[12
]}

Heid, E. ^{[2
]}

Hornidge, D. ^{[13
]}

Jaegle, I. ^{[1
]}

Jahn, O. ^{[2
]}

Kashevarov, V. L. ^{[2
,10
]}

Knezevic, A. ^{[14
]}

Kondratiev, R. ^{[15
]}

Korolija, M. ^{[14
]}

Kotulla, M. ^{[1
]}

Krambrich, D. ^{[2
]}

Kulbardis, A. ^{[5
]}

Lang, M. ^{[2
,4
]}

Lisin, V. ^{[15
]}

Livingston, K. ^{[3
]}

Lugert, S. ^{[12
]}

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

Manley, D. M. ^{[16
]}

Maghrbi, Y. ^{[1
]}

Martinez, M. ^{[2
]}

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

Mekterovic, D. ^{[14
]}

Metag, V. ^{[12
]}

Nefkens, B. M. K. ^{[9
]}

Nikolaev, A. ^{[2
,4
]}

Ostrick, M. ^{[2
]}

Pedroni, P. ^{[6
]}

Pheron, F. ^{[1
]}

Polonski, A. ^{[15
]}

Prakhov, S. ^{[9
]}

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

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

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

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

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

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

[10] Lebedev Phys Inst, RU-119991 Moscow, Russia

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

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

[13] Mt Allison Univ, Sackville, NB E4L3B5, Canada

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

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

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

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

来源：

EUROPEAN PHYSICAL JOURNAL A | 2012年 / 48卷 / 07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; TAGGED PHOTON SPECTROMETER; CHIRAL PERTURBATION-THEORY; HELICITY DEPENDENCE; NUCLEAR MEDIUM; SIGMA-MESON; GAMMA; POLARIZATION; EXCITATION;

D O I：

10.1140/epja/i2012-12098-1

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 total cross-sections and invariant-mass distributions have been measured for photoproduction of pion pairs off the proton producing p pi(0)pi(0) and n pi(+)pi(0) final states from the threshold region up to 800 MeV incident photon energy. Additionally, beam helicity asymmetries have been measured in the second resonance region (550 MeV-820 MeV). The experiment was performed at the tagged photon beam of the Mainz MAMI accelerator with the Crystal Ball and TAPS detectors combined to give an almost 4 pi solid-angle electromagnetic calorimeter. The results are much more precise than any previous measurements and confirm the chiral perturbation theory predictions for the threshold behavior of these reactions. In the second resonance region, the invariant-mass distributions of meson-meson and meson-nucleon pairs are in reasonable agreement with model predictions, but none of the models reproduce the asymmetries for the mixed-charge channel.

引用

页数：19

共 50 条

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F. Zehr
B. Krusche
P. Aguar
J. Ahrens
J. R. M. Annand
H. J. Arends
R. Beck
V. Bekrenev
B. Boillat
A. Braghieri
D. Branford
W. J. Briscoe
J. Brudvik
S. Cherepnya
R. F. B. Codling
E. J. Downie
P. Drexler
D. I. Glazier
L. V. Fil’kov
A. Fix
R. Gregor
E. Heid
D. Hornidge
I. Jaegle
O. Jahn
V. L. Kashevarov
A. Knezevic
R. Kondratiev
M. Korolija
M. Kotulla
D. Krambrich
A. Kulbardis
M. Lang
V. Lisin
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I. J. D. MacGregor
D. M. Manley
Y. Maghrbi
M. Martinez
J. C. McGeorge
D. Mekterovic
V. Metag
B. M. K. Nefkens
A. Nikolaev
M. Ostrick
P. Pedroni
F. Pheron
A. Polonski
S. Prakhov
[J]. The European Physical Journal A, 2012, 48
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