Observation of Dilepton Production
in Calcium-Calcium Collisions at 2.1 GeV/nucleon Kinetic Energy
R. Welsh (Johns Hopkins) 1992
This thesis was prepared under the guidance of Professor Leon Madansky.
The measurement of the production rate of low mass dielectrons (0.05 < m <
1.25 GeV/c^2) produced in Ca40-Ca40 collisions at 2.1 GeV/nucleon kinetic
energy is reported. Various candidate production mechanisms are presented.
An inter-nuclear-cascade Monte-Carlo calculation which accounts for all
observed dielectron production by the electromagnetic decay of known mesons
(pi0, eta, and rho) and higher nucleon states, baryon bremsstrahlung and a
possible contribution by pi+pi- annihilation is described. We study the
possibility that high mass dielectron production occurs in central
Ca40-Ca40 collisions by performing an associated charged particle
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