2002/10/25 by D. Anchishkin, Anchishkin, D., V. Khryapa +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0210346
17 pages, revtex, 9 figures
arxiv created 2002/10/25 · openalex publication_date 2002/10/25 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We analyze the dilepton emission rates from the hot pion gas confined to a finite space-time volume. Two models of pion(+) pion(-) annihilation to dileptons are under consideration. The first model mimics an extreme influence of the dense hadron environment on the rho-meson mean free path and mean life time. The second model deals with the standard concept of vector meson dominance when the hadron medium is not accounted. Our results indicate that the dilepton rates are finite in the low invariant mass region M<2mπ. It is found that the rates experience an enhancement in the electron-positron production when invariant mass tends to the "real" threshold M=2me. The breaking of the detailled energy-momentum conservation in favour of the integral one due to broken translation invariance is discussed.