Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8194597 | Physics Letters B | 2009 | 5 Pages |
Abstract
We compute dilepton invariant mass spectra from the decays of Ï mesons produced by photon reactions off nuclei. Our calculations employ a realistic model for the Ï photoproduction amplitude on the nucleon which provides fair agreement with measured cross sections. Medium effects are implemented via an earlier constructed Ï propagator based on hadronic many-body theory. At incoming photon energies of 1.5-3 GeV as used by the CLAS experiment at JLAB, the average density probed for iron targets is estimated at about half saturation density. At the pertinent 3-momenta the predicted medium effects on the Ï propagator are rather moderate. The resulting dilepton spectra approximately agree with recent CLAS data.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
F. Riek, R. Rapp, T.-S.H. Lee, Yongseok Oh,