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HK: Fachverband Physik der Hadronen und Kerne

HK 37: Hadron Structure and Spectroscopy 7

HK 37.1: Group Report

Tuesday, March 24, 2015, 17:00–17:30, T/SR19

New experimental results on the η^′-nucleus optical potential^⋆ — •Mariana Nanova for the CBELSA/TAPS collaboration — II. Physikalisches Institut, Justus-Liebig-Universität Gießen

The η^′-nucleus interaction has been studied in photo production of η^′-mesons off C and Nb targets, using the CBELSA/TAPS detector system. Transparency ratio measurements provide information on the inelastic cross section and in-medium width of mesons and thereby on the imaginary part of the meson-nucleus potential [1]. The real part of the optical potential can be deduced from measurements of the excitation function and momentum distribution which are sensitive to the sign and depth of the potential. Data taken on a C and Nb target have been analysed to determine the real part of the η^′ - nucleus optical potential. The results are compared to previous experimental results [2] and to model calculations assuming different scenarios for in-medium η^′ properties. The data of both measurements are consistent with a weakly attractive potential. The relatively small in-medium width of the η^′ meson encourages the search for η^′ bound states.
M. Nanova et al., Phys. Lett. B 710 (2012) 600
M. Nanova et al., Phys. Lett. B 727 (2013) 417
^⋆Funded by DFG(SFB/TR-16)