Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

The π N → e +e−N reaction close to the vector-meson production threshold

The π N → e +e−N reaction close to the vector-meson production threshold The π− p→e + e − n and π+ n→e + e − p reaction cross sections are calculated below and in the vicinity of the vector-meson (ϱ0,ω) production threshold. These processes are largely responsible for the emission of e +e− pairs in pion-nucleus reactions and contribute to the dilepton spectra observed in relativistic heavy ion collisions. They are dominated by the decay of low-lying baryon resonances into vector-meson-nucleon channels. The vector mesons materialize subsequently into e + e− pairs. Using πN→ϱ0 N and πN→ωN, amplitudes calculated in the center of mass energy interval 1.4 < √s<1.8 GeV, we compute the π− p→e + e − n and π+ n→e + e − p reaction cross sections in these kinematics. Below the vector-meson production threshold, the π0−ω interference in the e + e− channel appears largely destructive for the π− p→e + e − n cross section and constructive for the π+ n→e + e − p cross section. The pion beam and the HADES detector at GSI offer a unique possibility to measure these effects. Such data would provide strong constraints on the coupling of vector-meson-nucleon channels to low-lying baryon resonances. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Physica Hungarica Series A, Heavy Ion Physics Springer Journals

The π N → e +e−N reaction close to the vector-meson production threshold

Download PDF
9 pages

Loading next page...
 
/lp/springer-journals/the-n-e-e-n-reaction-close-to-the-vector-meson-production-threshold-yWx3KCb0t2

References (7)

Publisher
Springer Journals
Copyright
Copyright © 2003 by Akadémiai Kiadó
Subject
Physics; Nuclear Physics, Heavy Ions, Hadrons
ISSN
1219-7580
eISSN
1588-2675
DOI
10.1556/APH.17.2003.2-4.15
Publisher site
See Article on Publisher Site

Abstract

The π− p→e + e − n and π+ n→e + e − p reaction cross sections are calculated below and in the vicinity of the vector-meson (ϱ0,ω) production threshold. These processes are largely responsible for the emission of e +e− pairs in pion-nucleus reactions and contribute to the dilepton spectra observed in relativistic heavy ion collisions. They are dominated by the decay of low-lying baryon resonances into vector-meson-nucleon channels. The vector mesons materialize subsequently into e + e− pairs. Using πN→ϱ0 N and πN→ωN, amplitudes calculated in the center of mass energy interval 1.4 < √s<1.8 GeV, we compute the π− p→e + e − n and π+ n→e + e − p reaction cross sections in these kinematics. Below the vector-meson production threshold, the π0−ω interference in the e + e− channel appears largely destructive for the π− p→e + e − n cross section and constructive for the π+ n→e + e − p cross section. The pion beam and the HADES detector at GSI offer a unique possibility to measure these effects. Such data would provide strong constraints on the coupling of vector-meson-nucleon channels to low-lying baryon resonances.

Journal

Acta Physica Hungarica Series A, Heavy Ion Physics – Springer Journals

Published: Aug 28, 2009

There are no references for this article.