Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1992-08-06
Phys.Rev.D47:973-988,1993
Physics
High Energy Physics
High Energy Physics - Phenomenology
29 pages typed in revtex, 13 figures (not included), hardcopy available by regular mail upon request, McGill/92-33
Scientific paper
10.1103/PhysRevD.47.973
Production of electron-positron pairs with invariant masses less than 300 MeV from thermalized hadronic matter in relativistic heavy ion collisions is calculated using a soft virtual photon approximation. The general theoretical framework is reviewed and extended to include arbitrarily massed and charged reaction partners, which we apply to pions and quarks. This result, exact within the soft photon approximation, is compared with a widely used approximate result which uses an electromagnetic amplitude limited in validity to momentum transfers less than $4m_{\pi(q)}^{2}$. A comparison is made between the rate of production of zero total momentum soft dileptons obtained using resummation techniques in QCD perturbation theory to that which we calculate using this soft photon approximation.
Emel'yanov V.
Gale Charles
Haglin Kevin
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