Momentum dependence of the imaginary part of the omega- and eta`-nucleus optical potential

Friedrich, S. and Nanova, M. and Metag, V. and Afzal, F. N. and Bayadilov, D. and Bantes, B. and Beck, R. and Becker, M. and Boese, S. and Brinkmann, K. -T. and Crede, V. and Drexler, P. and Eberhardt, H. and Elsner, D. and Frommberger, F. and Funke, Ch. and Gottschall, M. and Gruener, M. and Gutz, E. and Hammann, Ch. and Hannappel, J. and Hartmann, J. and Hillert, W. and Hoffmeister, Ph. and Honisch, Ch. and Jude, T. and Kaiser, D. and Kalischewski, F. and Keshelashvili, I. and Klein, F. and Koop, K. and Krusche, B. and Lang, M. and Makonyi, K. and Messi, F. and Mueller, J. and Muellers, J. and Piontek, D. -M. and Rostomyan, T. and Schaab, D. and Schmidt, Ch. and Schmieden, H. and Schmitz, R. and Seifen, T. and Sokhoyan, V. and Sowa, C. and Spieker, K. and Thiel, A. and Thoma, U. and Triffterer, T. and Urban, M. and van Pee, H. and Walther, D. and Wendel, Ch. and Werthmuller, D. and Wiedner, U. and Wilson, A. and Witthauer, L. and Wunderlich, Y. and Zaunick, H. -G.. (2016) Momentum dependence of the imaginary part of the omega- and eta`-nucleus optical potential. European Physical Journal A: Hadrons and Nuclei , 52 (9). p. 297.

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The photoproduction of ω and η′ mesons off carbon and niobium nuclei has been measured as a function of the meson momentum for incident photon energies of 1.2-2.9GeV at the electron accelerator ELSA. The mesons have been identified via the ω→π0γ→3γ and η′→π0π0η→6γ decays, respectively, registered with the CBELSA/TAPS detector system. From the measured meson momentum distributions the momentum dependence of the transparency ratio has been determined for both mesons. Within a Glauber analysis the in-medium ω and η′ widths and the corresponding absorption cross sections have been deduced as a function of the meson momentum. The results are compared to recent theoretical predictions for the in-medium ω width and η′-N absorption cross sections. The energy dependence of the imaginary part of the ω- and η′-nucleus optical potential has been extracted. The finer binning of the present data compared to the existing data allows a more reliable extrapolation towards the production threshold. The modulus of the imaginary part of the η′-nucleus potential is found to be about three times smaller than recently determined values of the real part of the η′-nucleus potential, which makes the η′ meson a suitable candidate for the search for meson-nucleus bound states. For the ω meson, the modulus of the imaginary part near threshold is comparable to the modulus of the real part of the potential. As a consequence, only broad structures can be expected, which makes the observation of ω mesic states very difficult experimentally.
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
Publisher:EDP Sciences with Springer and Società Italiana di Fisica
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Feb 2017 14:31
Deposited On:22 Feb 2017 14:31

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