skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Role of heavy-meson exchange in pion production near threshold

Abstract

Recent calculations of {ital s}-wave pion production have severely underestimated the accurately known {ital pp}{r_arrow}{ital pp}{pi}{sup 0} total cross section near threshold. In these calculations, only the single-nucleon axial-charge operator is considered. We have calculated, in addition to the one-body term, the two-body contributions to this reaction that arise from the exchange of mesons. We find that the inclusion of the scalar {sigma}-meson exchange current (and lesser ocntributions from other mesons) increases the cross section by about a factor of 5 and leads to excellent agreement with the data. The results are sensitive neither to changes in the distorting potential that generates the {ital NN} wave functions nor to different choices for the meson-nucleon form factors.

Authors:
 [1];  [2];  [1]
  1. Department of Physics and Nuclear Theory Center, Indiana University, Bloomington, Indiana 47405 (United States)
  2. Department of Physics and Cyclotron Facility, Indiana University, Bloomington, Indiana 47405 (United States)
Publication Date:
Research Org.:
Indiana University
OSTI Identifier:
142659
DOE Contract Number:  
FG02-87ER40365
Resource Type:
Journal Article
Journal Name:
Physical Review, C
Additional Journal Information:
Journal Volume: 49; Journal Issue: 3; Other Information: PBD: Mar 1994
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; HYDROGEN 1 TARGET; PROTON REACTIONS; PROTON-PROTON INTERACTIONS; PIONS NEUTRAL; S WAVES; DIFFERENTIAL CROSS SECTIONS; MESONS; INTEGRAL CROSS SECTIONS; NUCLEON-NUCLEON INTERACTIONS; THEORETICAL DATA

Citation Formats

Horowitz, C.J., Meyer, H.O., and Griegel, D.K.. Role of heavy-meson exchange in pion production near threshold. United States: N. p., 1994. Web. doi:10.1103/PhysRevC.49.1337.
Horowitz, C.J., Meyer, H.O., & Griegel, D.K.. Role of heavy-meson exchange in pion production near threshold. United States. doi:10.1103/PhysRevC.49.1337.
Horowitz, C.J., Meyer, H.O., and Griegel, D.K.. Tue . "Role of heavy-meson exchange in pion production near threshold". United States. doi:10.1103/PhysRevC.49.1337.
@article{osti_142659,
title = {Role of heavy-meson exchange in pion production near threshold},
author = {Horowitz, C.J. and Meyer, H.O. and Griegel, D.K.},
abstractNote = {Recent calculations of {ital s}-wave pion production have severely underestimated the accurately known {ital pp}{r_arrow}{ital pp}{pi}{sup 0} total cross section near threshold. In these calculations, only the single-nucleon axial-charge operator is considered. We have calculated, in addition to the one-body term, the two-body contributions to this reaction that arise from the exchange of mesons. We find that the inclusion of the scalar {sigma}-meson exchange current (and lesser ocntributions from other mesons) increases the cross section by about a factor of 5 and leads to excellent agreement with the data. The results are sensitive neither to changes in the distorting potential that generates the {ital NN} wave functions nor to different choices for the meson-nucleon form factors.},
doi = {10.1103/PhysRevC.49.1337},
journal = {Physical Review, C},
number = 3,
volume = 49,
place = {United States},
year = {1994},
month = {3}
}