Double pion photoproduction off nuclei - Are there effects beyond final-state interaction?

被引：5

作者：

Maghrbi, Y. ^{[1
]}

Gregor, R. ^{[2
]}

Lugert, S. ^{[2
]}

Ahrens, J. ^{[3
]}

Annand, J. R. M. ^{[4
]}

Arends, H. J. ^{[3
]}

Beck, R. ^{[5
]}

Bekrenev, V. ^{[6
]}

Boillat, B. ^{[1
]}

Braghieri, A. ^{[7
]}

Branford, D. ^{[8
]}

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

Brudvik, J. ^{[10
]}

Cherepnya, S. ^{[11
]}

Codling, R. ^{[4
]}

Downie, E. J. ^{[3
,4
,9
]}

Dexler, P. ^{[2
]}

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

Fix, A. ^{[12
]}

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

Heid, E. ^{[3
]}

Hornidge, D. ^{[13
]}

Jahn, O. ^{[3
]}

Jaegle, I. ^{[1
]}

Kashevarov, V. L. ^{[3
,11
]}

Keshelashvili, I. ^{[1
]}

Knezevic, A. ^{[14
]}

Kondratiev, A. ^{[15
]}

Korolija, M. ^{[14
]}

Kotulla, M. ^{[1
,2
]}

Krambrich, D. ^{[3
]}

Krusche, B. ^{[1
]}

Lang, M. ^{[3
]}

Lisin, V. ^{[15
]}

Livingston, K. ^{[4
]}

MacGregor, I. J. D. ^{[4
]}

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

Martinez, M. ^{[3
]}

McGeorge, J. C. ^{[4
]}

Mekterovic, D. ^{[14
]}

Metag, V. ^{[2
]}

Nefkens, B. M. K. ^{[10
]}

Nikolaev, A. ^{[5
]}

Novotny, R. ^{[2
]}

Ostrick, M. ^{[3
]}

Pedroni, P. ^{[7
]}

Pheron, F. ^{[1
]}

Polonski, A. ^{[15
]}

Prakhov, S. N. ^{[10
]}

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

机构：

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

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

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

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

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

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

[7] INFN Sez Pavia, I-27100 Pavia, Italy

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

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

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

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

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

[13] Mt Allison Univ, Sackville, NB E4L 1E6, 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：

PHYSICS LETTERS B | 2013年 / 722卷 / 1-3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：

CHIRAL-SYMMETRY; SIGMA-MESON; THRESHOLD; RESTORATION; PI(0)PI(0); RESONANCE; PROTON; MATTER;

D O I：

10.1016/j.physletb.2013.04.014

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Photoproduction of pi(0)pi(0) and pi(0)pi(+/-) pairs from nuclei has been measured over a wide mass range (H-2, Li-7, C-12, Ca-40, and Pb-nat) for photon energies from threshold to 600 MeV. The experiments were performed at the MAMI accelerator in Mainz, using the Glasgow photon tagging spectrometer and a 4 pi electromagnetic calorimeter consisting of the Crystal Ball and TAPS detectors. A shift of the pion-pion invariant-mass spectra for heavy nuclei to small invariant masses has been observed for pi(0) pairs but also for the mixed-charge pairs. The precise results allow for the first time a model-independent analysis of the influence of pion final-state interactions. The corresponding effects are found to be large and must be carefully considered in the search for possible in-medium modifications of the sigma-meson. Results from a transport model calculation reproduce the shape of the invariant-mass distributions for the mixed-charge pairs better than for the neutral pairs, but also for the latter differences between model results and experiment are not large, leaving not much room for sigma-in-medium modification. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：69 / 75

页数：7

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