Transparency ratio in γA -> η' A' and the in-medium η' width

Details Transparency ratio in γA -> η' A' and the in-medium η' width Transparency ratio in γA -> η' A' and the in-medium η' width

2012-04-13

arxiv.org/abs/1204.2914v1

Physics Letters B 710 (2012) 600-606

Physics

Nuclear Physics

Nuclear Experiment

14 pages, 6 figures

Scientific paper

The photoproduction of \eta'-mesons off different nuclei has been measured with the CBELSA/TAPS detector system for incident photon energies between 1500 - 2200 MeV. The transparency ratio has been deduced and compared to theoretical calculations describing the propagation of \eta'-mesons in nuclei. The comparison indicates a width of the \eta' -meson of the order of \Gamma= 15-25 MeV at \rho =\rho_0 for an average momentum p_{\eta'} = 1050 MeV/c, at which the \eta'-meson is produced in the nuclear rest frame. The inelastic \eta' N cross section is estimated to be 3 - 10 mb. Parameterizing the photoproduction cross section of \eta'-mesons by \sigma(A) = \sigma_0 A^{\alpha}, a value of \alpha = 0.84\pm0.03 has been deduced.

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