Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-03-05
Phys.Rev. C67 (2003) 065202
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, 7 figures, more details of the calculations added, version to appear in Phys. Rev C
Scientific paper
10.1103/PhysRevC.67.065202
Within an effective Lagrangian model, we present calculations for cross sections of the dilepton production in proton-proton and proton-neutron collisions at laboratory kinetic energies in 1-5 GeV range. Production amplitudes include contributions from the nucleon-nucleon bremsstrahlung as well as from the mechanism of excitation, propagation, and radiative decay of Delta(1232) and N*(1520) intermediate baryonic resonances. It is found that the delta isobar terms dominate the cross sections in the entire considered beam energy range. Our calculations are able to explain the data of the DLS collaboration on the dilepton production in proton-proton collisions for beam energies below 1.3 GeV. However, for incident energies higher than this the inclusion of contributions from other dilepton sources like Dalitz decay of pi0 and eta mesons, and direct decay of rho and omega mesons is necessary to describe the data.
Mosel Ulrich
Shyam Radhey
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