In-medium modifications of the omega meson near the production threshold

Thiel, M. and Metag, V. and Bartolome, P. Aguar and Akasoy, L. K. and Annand, J. R. M. and Arends, H. J. and Bantawa, K. and Beck, R. and Bekrenev, V. and Berghaeuser, H. and Braghieri, A. and Briscoe, W. J. and Brudvik, J. and Cherepnya, S. and Dieterle, M. and Downie, E. J. and Drexler, P. and Fil`kov, L. V. and Friedrich, S. and Glazier, D. I. and Gregor, R. and Heid, E. and Hornidge, D. and Jahn, O. and Jude, T. C. and Kashevarov, V. L. and Keshelashvili, I. and Kondratiev, R. and Korolija, M. and Kotulla, M. and Krusche, B. and Kulbardis, A. and Lemmer, B. and Lisin, V. and Livingston, K. and Lugert, S. and MacGregor, I. J. D. and Maghrbi, Y. and Mancell, J. and Manley, D. M. and Martinez, M. and McGeorge, J. C. and McNicoll, E. F. and Middleton, D. G. and Mushkarenkov, A. and Nanova, M. and Nefkens, B. M. K. and Nikolaev, A. and Novotny, R. W. and Ostrick, M. and Pedroni, P. and Pheron, F. and Polonski, A. and Prakhov, S. N. and Robinson, J. and Rosner, G. and Rostomyan, T. and Schumann, S. and Sikora, M. H. and Starostin, A. and Supek, I. and Thomas, A. and Unverzagt, M. and Watts, D. P. and Weil, J. and Werthmueller, D. and Zamboni, I.. (2013) In-medium modifications of the omega meson near the production threshold. The European physical journal. A, Hadrons and nuclei, Vol. 49, H. 10. p. 132.

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Official URL: http://edoc.unibas.ch/dok/A6223416

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The in-medium properties of the omega meson were investigated at the MAMI-C electron accelerator using the Crystal Ball/TAPS detector system to identify omega mesons through their omega -< pi(0)gamma decay channel. Two solid targets (C, Nb) and a LH2 target as a reference have been used. In the energy range 900 to 1300 MeV the omega lineshapes for the different nuclei are compared and a broadening of the omega signal for the niobium target is observed in comparison to the liquid-hydrogen target. In a second analysis the omega momentum distributions for the solid targets are determined for 50 MeV/c wide bins. For both analyses a comparison to transport calculations shows that the data are consistent with an in-medium modification by collisional broadening, as observed by transparency ratio measurements.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
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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