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19 April 2024

» arxiv » 1304.1918

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Double pion photoproduction off nuclei - are there effects beyond final-state interaction?
Y. Maghrbi ; R. Gregor ; S. Lugert ; 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. Codling ; E.J. Downie ; P. Dexler ; L.V. Fil'kov ; A. Fix ; D.I. Glazier ; E. Heid ; D. Hornidge ; O. Jahn ; I. Jaegle ; V.L. Kashevarov ; I. Keshelashvili ; A. Knezevic ; A. Kondratiev ; M. Korolija ; M. Kotulla ; D. Krambrich ; B. Krusche ; M. Lang ; V. Lisin ; K. Livingston ; I.J.D. MacGregor ; D.M. Manley ; M. Martinez ; J.C. McGeorge ; D. Mekterovic ; V. Metag ; B.M.K. Nefkens ; A. Nikolaev ; R. Novotny ; M. Ostrick ; P. Pedroni ; F. Pheron ; A. Polonski ; S.N. Prakhov ; J.W. Price ; G. Rosner ; M. Rost ; T. Rostomyan ; S. Schadmand ; S. Schumann ; D. Sober ; S. Starostin ; I. Supek ; A. Thomas ; M. Unverzagt ; D.P. Watts ; D. Werthmueller ; F. Zehr ;
Date:	6 Apr 2013
Abstract:	Photoproduction of $pi^{0}pi^{0}$ and $pi^{0}pi^{pm}$ pairs from nuclei has been measured over a wide mass range ($^2$H, $^{7}$Li, $^{12}$C, $^{40}$Ca, and $^{ m nat}$Pb) 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.
Source:	arXiv, 1304.1918
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