Published October 1989 | Version v1
Journal article Metadata-only

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

Creators

  • 1. School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455 (USA)
  • 2. Theoretical Physics Institute, University of Minnesota, Minneapolis, Minnesota 55455

Description

The Dilepton Spectrometer collaboration has reported a bump in the e+e- mass distribution at around 2mπ 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 Δ 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

Additional details

Publishing Information

Journal Title
Physical Review, C
Journal Volume
40
Journal Issue
4
Series
Phys. Rev., C.
Journal Page Range
1574-1576
ISSN
0556-2813
CODEN
PRVCA

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
21017212
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Descriptors DEI
ANNIHILATION; BERYLLIUM 9 TARGET; CROSS SECTIONS; ELECTRON PAIRS; GEV RANGE 01-10; PAIR PRODUCTION; PARTICLE KINEMATICS; PHASE SPACE; PION-PION INTERACTIONS; PROTON REACTIONS; PROTON-PROTON INTERACTIONS; WIGNER DISTRIBUTION
Descriptors DEC
BARYON REACTIONS; BARYON-BARYON INTERACTIONS; ENERGY RANGE; GEV RANGE; HADRON REACTIONS; HADRON-HADRON INTERACTIONS; INTERACTIONS; MATHEMATICAL SPACE; MESON-MESON INTERACTIONS; NUCLEAR REACTIONS; NUCLEON REACTIONS; NUCLEON-NUCLEON INTERACTIONS; PARTICLE INTERACTIONS; PARTICLE PRODUCTION; PROTON-NUCLEON INTERACTIONS; SPACE; TARGETS