Contribution of two-pion annihilation to dilepton emission from proton-nucleon collisions

Joseph I Kapusta, Peter Lichard

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

The Dilepton Spectrometer collaboration has reported a bump in the e+e- mass distribution at around 2m in 4.9 GeV proton-Be collisions. Previous calculations have shown that this bump does not have its origin in nucleon-nucleon bremsstrahlung nor in the Dalitz decay of the resonance. In this paper we estimate the contribution from two-pion annihilation based on relativistic kinetic theory, on the experimentally measured cross sections for the production of up to five pions, and on a phase space generator for the pion momentum distributions. The calculation fails to reproduce the data.. The origin of the bump remains unexplained.

Original languageEnglish (US)
JournalPhysical Review C
Volume40
Issue number4
DOIs
StatePublished - Jan 1 1989

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