Medium Modifications of the Rho Meson in Nuclear Photoproduction

Abstract

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.

11 pages

References in corpus (7)

• Hadrons in strongly interacting matter
• phi photo-production from Li, C, Al, and Cu nuclei at Egamma=1.5 - 2.4 GeV
• Evidence for the production of thermal muon pairs with masses above 1 GeV/c^2 in 158A GeV Indium-Indium Collisions
• 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
• Inclusive $\omega$ photoproduction from nuclei and $\omega$ in the nuclear medium
• Omega attenuation in nuclei

Cited by in corpus (11)

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• First measurement of low momentum dielectrons radiated off cold nuclear matter
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• Broadening of $\rho (\to e^{+}{e}^{-})$ meson produced coherently in the photonuclear reaction
• Absorption of $\omega$ and $\varphi$ mesons in the inclusive photonuclear reaction
• Nuclear effects on the $\rho$ meson produced in the inclusive photonuclear reaction
• Effect of in-medium parameters of rho meson in its photoproduction reactions on nuclei
• Forward coherent $\omega$ and $\varphi$ mesons production in the photon induced reaction on nuclei
• Microscopic Description of K^+ Scattering on 4^He, 16^O and 40^Ca Nuclei using Meson Exchange Theory
• Selfconsistent descriptions of vector-mesons in hot matter revisited