6533b7d3fe1ef96bd12606a2

RESEARCH PRODUCT

Transparency ratio in gamma A -> eta ' A ' and the in-medium eta ' width

Mariana NanovaÀNgels Ramos GómezEulogio Oset Báguena

subject

Nuclear TheoryFísicaHigh Energy Physics::ExperimentNuclear Experiment

description

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.

10.1016/j.physletb.2012.03.039http://hdl.handle.net/10550/46692