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

Maghrbi, Y. and Gregor, R. and Lugert, S. and Ahrens, J. and Annand, J. R. M. and Arends, H. J. and Beck, R. and Bekrenev, V. and Boillat, B. and Braghieri, A. and Branford, D. and Briscoe, W. J. and Brudvik, J. and Cherepnya, S. and Codling, R. and Downie, E. J. and Dexler, P. and Fil`kov, L. V. and Fix, A. and Glazier, D. I. and Heid, E. and Hornidge, D. and Jahn, O. and Jaegle, I. and Kashevarov, V. L. and Keshelashvili, I. and Knezevic, A. and Kondratiev, A. and Korolija, M. and Kotulla, M. and Krambrich, D. and Krusche, B. and Lang, M. and Lisin, V. and Livingston, K. and MacGregor, I. J. D. and Manley, D. M. and Martinez, M. and McGeorge, J. C. and Mekterovic, D. and Metag, V. and Nefkens, B. M. K. and Nikolaev, A. and Novotny, R. and Ostrick, M. and Pedroni, P. and Pheron, F. and Polonski, A. and Prakhov, S. N. and Price, J. W. and Rosner, G. and Rost, M. and Rostomyan, T. and Schadmand, S. and Schumann, S. and Sober, D. and Starostin, A. and Supek, I. and Thomas, A. and Unverzagt, M. and Watts, D. P. and Werthmueller, D. and Zehr, F.. (2013) Double pion photoproduction off nuclei - Are there effects beyond final-state interaction? Physics letters. B, Vol. 722, H. 1-3. pp. 69-75.

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Official URL: http://edoc.unibas.ch/dok/A6223420

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Abstract

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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:North-Holland
ISSN:0370-2693
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:27 Mar 2014 13:12
Deposited On:27 Mar 2014 13:12

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