Medium Effects in rho-Meson Photoproduction

Abstract

We compute dilepton invariant mass spectra from the decays of rho mesons produced by photon reactions off nuclei. Our calculations employ a realistic model for the rho photoproduction amplitude on the nucleon which provides fair agreement with measured cross sections. Medium effects are implemented via an earlier constructed rho 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 rho-meson 3-momenta the predicted medium effects on the rho propagator are rather moderate. The resulting dilepton spectra approximately agree with recent CLAS data.

One numerical error corrected, conclusions unchanged

References in corpus (9)

• First Measurement of the rho Spectral Function in High-Energy Nuclear Collisions
• Dilepton Radiation at the CERN Super Proton Synchrotron
• phi photo-production from Li, C, Al, and Cu nuclei at Egamma=1.5 - 2.4 GeV
• Modification of the rho meson detected by low-mass electron-positron pairs in central Pb-Au collisions at 158 A GeV/c
• Modification of the $\omega$-Meson Lifetime in Nuclear Matter
• Nucleon and Delta resonances in K Sigma(1385) photoproduction from nucleons
• Search for medium modification of the $\rho$ meson
• Light Vector Mesons in the Nuclear Medium
• Inclusive $\omega$ photoproduction from nuclei and $\omega$ in the nuclear medium

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• Medium Modifications of Hadron Properties and Partonic Processes
• Sum rule analysis of vector and axial-vector spectral functions with excited states in vacuum
• Medium Modifications of the Rho Meson in Nuclear Photoproduction
• A novel spectral broadening from vector--axial-vector mixing in dense matter
• Novel spectral broadening from vector--axial-vector mixing in dense matter
• The $\pi \rho$ Cloud Contribution to the $\omega$ Width in Nuclear Matter
• Broadening of $\rho (\to e^{+}{e}^{-})$ meson produced coherently in the photonuclear reaction
• Evaluating chiral symmetry restoration through the use of sum rules
• Baryonic Sources of Thermal Photons
• Nuclear effects on the $\rho$ meson produced in the inclusive photonuclear reaction
• Forward coherent $\omega$ and $\varphi$ mesons production in the photon induced reaction on nuclei
• Selfconsistent descriptions of vector-mesons in hot matter revisited