Search for medium modification of the $\rho$ meson

Abstract

The photoproduction of vector mesons on various nuclei has been studied using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Laboratory. The vector mesons, $\rho$, $\omega$, and $\varphi$, are observed via their decay to $e^{+}{e}^{-}$, in order to reduce the effects of final state interactions in the nucleus. Of particular interest are possible in-medium effects on the properties of the $\rho$ meson. The $\rho$ spectral function is extracted from the data on various nuclei, carbon, iron, and titanium, and compared to the spectrum from liquid deuterium, which is relatively free of nuclear effects. We observe no significant mass shift for the $\rho$ meson; however, there is some widening of the resonance in titanium and iron, which is consistent with expected collisional broadening.

8 pages, 4 figures

References in corpus (6)

• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• First Measurement of the rho Spectral Function in High-Energy Nuclear Collisions
• Lattice Simulations of the Thermodynamics of Strongly Interacting Elementary Particles and the Exploration of New Phases of Matter in Relativistic Heavy Ion Collisions
• NA60 results on the rho spectral function in In-In collisions
• First measurement of the rho spectral function in nuclear collisions
• Weighted finite energy sum rules for the omega meson in nuclear matter

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• Shell model description of the 14C dating beta decay with Brown-Rho-scaled NN interactions
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• Measurement of the in-medium K0 inclusive cross section in pi- -induced reactions at 1.15 GeV/c
• The $\varphi$ meson with finite momentum in a dense medium
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• Medium Modifications of Hadron Properties and Partonic Processes
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• Neutral quark matter in a Nambu-Jona Lasinio model with vector interaction
• Medium Effects in rho-Meson Photoproduction
• Electromagnetic Probes
• Chiral Symmetry and light resonances in hot and dense matter
• Medium Modifications of the Rho Meson in Nuclear Photoproduction
• Light vector correlator in medium: Wilson coefficients up to dimension 6 operators
• In-medium modified $\pi$-$\rho$-$\omega$ mesonic Lagrangian and properties of nuclear matter
• A novel spectral broadening from vector--axial-vector mixing in dense matter
• Novel spectral broadening from vector--axial-vector mixing in dense matter
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• Broadening of $\rho (\to e^{+}{e}^{-})$ meson produced coherently in the photonuclear reaction
• Low energy ω(\to π^0 γ) meson photoproduction in the nucleus
• Absorption of $\omega$ and $\varphi$ mesons in the inclusive photonuclear reaction
• Nuclear dependence of light neutral meson production in p-A collisions at 400 GeV with NA60
• Medium effects on the electromagnetic form factors of the $\rho$ meson
• Vacuum fluctuation effects on asymmetric nuclear matter
• Effect of in-medium parameters of rho meson in its photoproduction reactions on nuclei
• Nuclear effects on the $\rho$ meson produced in the inclusive photonuclear reaction
• Partial restoration of chiral symmetry in hot and dense neutron matter
• Forward coherent $\omega$ and $\varphi$ mesons production in the photon induced reaction on nuclei
• Probing resonance matter with virtual photons
• Selfconsistent descriptions of vector-mesons in hot matter revisited