Medium Modifications of the Rho Meson in Nuclear Photoproduction

Details Medium Modifications of the Rho Meson in Nuclear Photoproduction Medium Modifications of the Rho Meson in Nuclear Photoproduction

2010-03-04

arxiv.org/abs/1003.0910v2

Physics

Nuclear Physics

Nuclear Theory

11 pages

Scientific paper

We extend our recent study of dilepton invariant-mass spectra from the decays of rho mesons produced by photon reactions off nuclei. We specifically focus on experimental spectra as recently measured by the CLAS Collaboration at the Thomas Jefferson National Accelerator Facility using carbon and iron nuclei. Building on our earlier work we broaden our description to a larger set of observables in order to identify sensitivities to the medium effects predicted by microscopic calculations of the rho spectral function. We compute mass spectra for several target nuclei and study the spectral shape as a function of the 3-momentum of the outgoing lepton pair. We also compute the so-called nuclear transparency ratio which provides an alternative means (and thus consistency check) of estimating the inelastic rho width in the cold nuclear medium.

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