Role of heavy-meson exchange in pion production near threshold

Journal Article · Tue Mar 01 04:00:00 EST 1994 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.49.1337· OSTI ID:142659

Horowitz, C J ^[1]; Meyer, H O ^[2]; Griegel, D K ^[1]

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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)

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.

• Research Organization: Indiana University
• DOE Contract Number: FG02-87ER40365
• OSTI ID: 142659
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 3 Vol. 49; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
DIFFERENTIAL CROSS SECTIONS
HYDROGEN 1 TARGET
INTEGRAL CROSS SECTIONS
MESONS
NUCLEON-NUCLEON INTERACTIONS
PIONS NEUTRAL
PROTON REACTIONS
PROTON-PROTON INTERACTIONS
S WAVES
THEORETICAL DATA