Dileptons as a probe of pion dynamics in dense nuclear matter /
| Main Author: | |
|---|---|
| Other Authors: | , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1991.
|
| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Abstract: | This thesis investigates the possibility of probing the pion dynamics in dense nuclear matter via dilepton production from heavy ion collisions. We have studied the systematics of dilepton production processes and have evaluated the cross sections of dilepton production from nuclear bremsstrahlung, delta decay, pion-nucleon interaction and pion-pion annihilation. Assuming all the pions are free particles, the spectra of dilepton production from proton-nucleus and nucleus-nucleus collisions have been carried out in the cascade model and the VUU model, respectively. The comparison of the theoretical calculations with the experimental data available from DLS collaboration at BEVALAC is presented. Taking into account the pion interaction in nuclear medium based on the delta-hole model, we have studied the pion-pion annihilation process in the framework of the fire ball model. We have included self-consistently, the medium effects on the process from pion dispersion relation, the pion-pion annihilation vertex, the imaginary part of the pion self energy; and, have extended the studies to cases where the total momentum of a dilepton pair is finite. To pursue a realistic study of pion dynamics in nuclear medium, we have, for the first time, extended the VUU model by including the medium effects and treating pions as quasi particles. We have calculated the pion spectrum from heavy ion collisions using the extended model and have found the "soft pion enhancement" phenomenon in our results. |
|---|---|
| Item Description: | Typescript (photocopy). Vita. "Major subject: Physics." |
| Physical Description: | xii, 99 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |