In-medium ω-meson broadening and s-wave pion annihilation into e+e- pairs

G. Wolf, Bengt Friman, Madeleine Soyeur

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

An ω-meson in motion with respect to a nuclear medium can couple to a σ-meson through a particle-hole excitation. This coupling is large. We investigate its consequences for the width of ω-mesons in matter and for the s-wave annihilation of pions into lepton pairs which can take place in relativistic heavy ion collisions. We find that the two pion decay of ω-mesons, resulting from the ω-σ transition and the subsequent 2π decay of the σ-meson, leads to a substantial broadening of ω-mesons in matter and possibly to an observable effect in experiments measuring the e+e- decay of vector mesons produced in nuclei and in relativistic heavy-ion collisions. The inverse process, the s-wave annihilation of pions into ω-mesons decaying into e+e- pairs, has in general a much smaller cross section than the corresponding p-wave annihilation through p-mesons and is expected to contribute rather little to the total e+e- pair production in relativistic heavy ion collisions.

Original languageEnglish
Pages (from-to)129-143
Number of pages15
JournalNuclear Physics A
Volume640
Issue number1
Publication statusPublished - Sep 7 1998

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pions
mesons
ionic collisions
decay
vector mesons
pair production
leptons
nuclei
cross sections
excitation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

In-medium ω-meson broadening and s-wave pion annihilation into e+e- pairs. / Wolf, G.; Friman, Bengt; Soyeur, Madeleine.

In: Nuclear Physics A, Vol. 640, No. 1, 07.09.1998, p. 129-143.

Research output: Contribution to journalArticle

Wolf, G. ; Friman, Bengt ; Soyeur, Madeleine. / In-medium ω-meson broadening and s-wave pion annihilation into e+e- pairs. In: Nuclear Physics A. 1998 ; Vol. 640, No. 1. pp. 129-143.
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