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

Thiel, M. et al. (2013) In-medium modifications of the ω meson near the production threshold. European Physical Journal A, 49(132), (doi:10.1140/epja/i2013-13132-6)

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Abstract

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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Middleton, Mr Duncan and Livingston, Dr Kenneth and McNicoll, Miss Eilidh and Mancell, Mr Joe and Glazier, Dr Derek and McGeorge, Dr John and Robinson, Mr Jamie and Downie, Dr Evangeline and MacGregor, Professor I and Annand, Dr John and Rosner, Professor Guenther
Authors: Thiel, M., Metag, V., Bartolome, P. A., Akasoy, L. K., Annand, J.R.M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghaeuser, H., Braghieri, A., Briscoe, W. J., Brudvik, J., Cherepnya, S., Dieterle, M., Downie, E.J., Drexler, P., Fil'kov, L. V., Friedrich, S., Glazier, D.I., Gregor, R., Heid, E., Hornidge, D., Jahn, O., Jude, T. C., Kashevarov, V. L., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Krusche, B., Kulbardis, A., Lemmer, B., Lisin, V., Livingston, K., Lugert, S., MacGregor, I.J.D., Maghrbi, Y., Mancell, J., Manley, D. M., Martinez, M., McGeorge, J.C., McNicoll, E.F., Middleton, D.G., Mushkarenkov, A., Nanova, M., Nefkens, B. M. K., Nikolaev, A., Novotny, R. W., Ostrick, M., Pedroni, P., Pheron, F., Polonski, A., Prakhov, S. N., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M. H., Starostin, A., Supek, I., Thomas, A., Unverzagt, M., Watts, D. P., Weil, J., Werthmueller, D., and Zamboni, I.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Research Group:Nuclear Physics
Journal Name:European Physical Journal A
Publisher:Springer
ISSN:1434-6001
ISSN (Online):1434-601X
Copyright Holders:Societ`a Italiana di Fisica / Springer-Verlag

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
570711Nuclear Physics GroupDavid IrelandScience & Technologies Facilities Council (STFC)ST/J000175/1P&A - PHYSICS & ASTRONOMY