Test of phi renormalization in nuclei through phi photoproduction
arXiv:nucl-th/0011019 · doi:10.1016/S0370-2693(01)00542-1
Abstract
We propose an experimental procedure to find out the medium modifications of the $Ï$ meson. The reaction is inclusive $Ï$ photoproduction in nuclei, looking for $K^+ K^-$ pairs from the $Ï$ decay with total momentum smaller than 100-150 $MeV/c$, which are made possible at energies of present laboratories from center of mass $Ï$ backward production and the help of Fermi motion. We have conducted a many body calculation of the mass distribution of the $Ï$ adapted to the experimental set up of a recent JLAB experiment where the backwards $Ï$ photoproduction has been measured. Using recent results for the in medium properties of the $Ï$, we find that the width of the invariant mass distribution for photoproduction on medium to heavy nuclei is larger than the free $Ï$ width by a factor of two or more.
10 pages, 3 figures