$e^{+}{e}^{-}$ pairs from ${\pi }^{-}$A reactions

Abstract

We present a dynamical study of $e^{+}{e}^{-}$ production in ${\pi }^{-}$A reactions at 1.3 and 1.7 GeV on the basis of the Coupled-Channel-BUU approach. The contributions from vector mesons ($\rho ,\omega$) are calculated taking into account the collisional broadening effect and are compared to background sources in the dilepton spectrum from the Dalitz decays of $\omega$ and $\eta$ mesons produced in the reaction. Two possible scenarios for the medium modifications of the vector mesons are investigated, i.e. the 'dropping mass' scheme for the $\rho$ and $\omega$ and a momentum dependent $\rho$-meson spectral function that includes the polarization of the $\rho$-meson due to resonant $\rho -N$ scattering.

31 pages, ReVTeX, including 8 postscript figures, to appear in Phys. Rev. C

References in corpus (12)

• Current correlation functions, QCD sum rules and vector mesons in baryonic matter
• Rho Meson Propagation and Dilepton Enhancement in Hot Hadronic Matter
• The Spectral Function of the Rho Meson in Nuclear Matter
• What QCD sum rules tell about the rho meson
• P-Wave Polarization of the $\rho$-Meson and the Dilepton Spectrum in Dense Matter
• Probing the Rho Spectral Function in Hot and Dense Nuclear Matter by Dileptons
• Dilepton production and $m_T$-scaling at BEVALAC/SIS energies
• Medium effects in the production and decay of vector mesons in pion-nucleus reactions
• $\rho$-meson properties at finite nuclear density
• Formalism for dilepton production via virtual photon bremsstrahlung in hadronic reactions
• Medium effects in the production and decay of $\omega$- and $\rho$-resonances in pion-nucleus interactions
• Probing nuclear expansion dynamics with ${\pi }^{-}/{\pi }^{+}$-spectra

Cited by in corpus (17)

• First observation of in-medium modifications of the omega meson
• Charged Current Neutrino Nucleus Interactions at Intermediate Energies
• Hadron attenuation in deep inelastic lepton-nucleus scattering
• Neutral current neutrino-nucleus interactions at intermediate energies
• e+ e- pairs from pi- A reactions
• Inclusive omega photoproduction off nuclei
• Studying the $\omega$ properties in pA collisions via the $\omega \to {\pi }^0\gamma$ decay
• Momentum dependence of pion-induced $\varphi$ meson production on nuclei near threshold
• In-medium Properties of Hadrons -- Observables
• ${\pi }^{+}{\pi }^{-}$ Emission from Coherent ${\rho }^0$ Propagation in Nuclei
• In-Medium Properties of Hadrons - Observables II
• Low energy ω(\to π^0 γ) meson photoproduction in the nucleus
• 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
• ${\pi }^0\gamma$ invariant mass distribution in the low energy $\gamma p\to \omega p$ reaction