PT Journal
AU Nanova, Mea
   Oset, E
TI Transparency ratio in gamma A -> eta ' A ' and the in-medium eta ' width
SO Physics Letters B
JI Phys. Lett. B
PY 2012
BP 600
EP 606
VL 710
IS 4-5
DI 10.1016/j.physletb.2012.03.039
LA English
AB 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 +/- 0.03 has been deduced.
ER