Dilepton Production in Nucleon-Nucleon Reactions With and Without Hadronic Inelasticities

Abstract

We calculate elementary proton-proton and neutron-proton bremsstrahlung and their contribution to the $e^{+}{e}^{-}$ invariant mass distribution. At 4.9 GeV, the proton-proton contribution is larger than neutron-proton, but it is small compared to recent data. We then make a first calculation of bremsstrahlung in nucleon-nucleon reactions with multi-hadron final states. Again at 4.9 GeV, the many-body bremsstrahlung is larger than simple nucleon-nucleon bremsstrahlung by more than an order of magnitude in the low-mass region. When the bremsstrahlung contributions are summed with Dalitz decay of the $\eta$, radiative decay of the $\Delta$ and from two-pion annihilation, the result matches recent high statistics proton-proton data from the Dilepton Spectrometer collaboration.

1+17 pages plus 11 PostScript figures uuencoded and appended, McGill/93-9, TPI-MINN-93/18-T

References in corpus (2)

• Anatomy of the Soft-Photon Approximation in Hadron-Hadron Bremsstrahlung
• Virtual bremsstrahlung from pions and quarks in thermalized hadronic matter

Cited by in corpus (12)

• Intermediate mass excess of dilepton production in heavy ion collisions at BEVALAC energies
• Inclusive Dielectron Cross Sections in p+p and p+d Interactions at Beam Energies from 1.04 to 4.88 GeV
• Di-Electron Bremsstrahlung in Intermediate-Energy pn and Dp Collisions
• Role of baryonic resonances in the dilepton emission in nucleon-nucleon collisions
• Dilepton production in proton-proton collisions at BEVALAC energies
• e^+e^- production from pp reactions at BEVALAC energies
• Formalism for dilepton production via virtual photon bremsstrahlung in hadronic reactions
• Di-Electrons from Resonances in Nucleon-Nucleon Collisions
• Dilepton production from p-p to Ca-Ca at the Bevalac
• Decay Anisotropy of $e^{+}{e}^{-}$ Sources from $pN$ and $pd$ collisions
• Hadron Formation Time and Dilepton Mass Spectra in Heavy Ion Collisions
• Bremsstrahlung in intermediate-energy nucleon reactions within an effective one-boson exchange model