Thermal effects on dilepton production from π-π annihilation

Chungsik Song, Volker Koch, Su Houng Lee, C. M. Ko

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Abstract

We study finite temperature effects on dilepton production from pion-pion annihilation in hot hadronic matter. The softening of the pion dispersion relation in a medium is found to enhance the production rate of dileptons with invariant masses in the region of 2m*π(T) < M < mρ. On the other hand, the reduction of the pion electromagnetic form factor at finite temperature leads to a suppression of the dilepton production rate. Including both effects, we have found that the dilepton yield is slightly enhanced in the invariant mass region M = 270 ∼ 600 MeV but is suppressed around the vector meson resonance. We further discuss the relevance of our results to recent experimental data from the S+Au collisions at CERN/SPS energies by the CERES Collaboration.

Original languageEnglish
Pages (from-to)379-384
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume366
Issue number1-4
DOIs
Publication statusPublished - 1996 Jan 11

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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