Di-Electrons from Resonances in Nucleon-Nucleon Collisions

Abstract

The contribution of the low-lying nucleon resonances $P_{33}(1232)$, $P_{11}(1440)$ $D_{13}(1520)$ and $S_{11}(1535)$ to the invariant mass spectra of di-electrons stemming from the exclusive processes $pp\to pp{e}^{+}{e}^{-}$ and $pn\to pn{e}^{+}{e}^{-}$ is investigated within a fully covariant and gauge invariant diagrammatical approach. We employ, within the one-boson exchange approximation, effective nucleon-meson interactions including the exchange mesons $\pi$, $\eta$, $\sigma$, $\omega$ and $\rho$ as well as excitations and radiative decays of the above low-lying nucleon resonances. The total contribution of these resonances is dominant, however, bremsstrahlung processes in $pp$ and, in particular, $pn$ collisions at beam energies of 1 - 2 GeV are still significant in certain phase space regions.

References in corpus (10)

• Electromagnetic excitation of the Delta(1232)-resonance
• Dilepton production and off-shell transport dynamics at SIS energies
• Study of dielectron production in C+C collisions at 1 AGeV
• Production and evolution path of dileptons at HADES energies
• Model independent determination of the sigma pole
• Dilepton production in heavy-ion collisions with in-medium spectral functions of vector mesons
• Analysis of Dilepton Invariant Mass Spectrum in C+C at 2 and 1 AGeV
• Dilepton production in nucleon-nucleon collisions reexamined
• eta-prime Meson Production in Nucleon-Nucleon Collisions Near The Threshold
• Di-electrons from $\eta$ meson Dalitz decay in proton-proton collisions

Cited by in corpus (12)

• Dielectron production in Ar+KCl collisions at 1.76A GeV
• Timelike gamma* N -> Delta form factors and Delta Dalitz decay
• A versatile method for simulating pp -> ppe+e- and dp -> pne+e-p_spec reactions
• Dilepton production in proton-proton and quasifree proton-neutron reactions at 1.25 GeV
• Valence quark and meson cloud contributions to the ${\gamma }^{\ast }N\to N^{\ast }(1520)$ form factors
• $\Delta$(1232) Dalitz decay in proton-proton collisions at T=1.25 GeV measured with HADES
• Spectral caustics in laser assisted Breit-Wheeler process
• ${\gamma }^{\ast }N\to N^{\ast }(1520)$ form factors in the timelike regime
• Dilepton production in pion-nucleon collisions in an effective field theory approach
• Analysis of the exclusive final state npe${}^{+}$e${}^{-}$ in quasi-free np reaction
• Gauge-invariant formulation of $NN\to NN\gamma$
• Dilepton and $\varphi$ meson production in elementary and nuclear collisions at the NICA fixed target experiment