πd→ ηNN reaction near threshold

H. Garcilazo, M. T. Peña

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We calculated the differential and total cross sections of the reaction πd→ ηNN near threshold taking into account all the single- and double-scattering graphs within a relativistic formalism. The net effect of the second order diagrams is very small since there is a strong cancellation between the pion-exchange diagram and the sum of the η exchange with the nucleon-nucleon final state interaction diagrams. Our theoretical results are compared with recent experimental data for the differential yield, corresponding to the counting rate for the detection of the two photons into which the produced η decays. The quality of the agreement between theory and existing data between 35 and 100 MeV above threshold does not indicate, at those energies, effects of a possible ηNN quasibound state.
Original languageAmerican English
Pages (from-to)110021-110025
Number of pages99018
JournalPhysical Review C - Nuclear Physics
StatePublished - 1 Jan 2000

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diagrams
thresholds
cancellation
counting
pions
formalism
cross sections
photons
decay
scattering
interactions
energy

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πd→ ηNN reaction near threshold. / Garcilazo, H.; Peña, M. T.

In: Physical Review C - Nuclear Physics, 01.01.2000, p. 110021-110025.

Research output: Contribution to journalArticle

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T1 - πd→ ηNN reaction near threshold

AU - Garcilazo, H.

AU - Peña, M. T.

PY - 2000/1/1

Y1 - 2000/1/1

N2 - We calculated the differential and total cross sections of the reaction πd→ ηNN near threshold taking into account all the single- and double-scattering graphs within a relativistic formalism. The net effect of the second order diagrams is very small since there is a strong cancellation between the pion-exchange diagram and the sum of the η exchange with the nucleon-nucleon final state interaction diagrams. Our theoretical results are compared with recent experimental data for the differential yield, corresponding to the counting rate for the detection of the two photons into which the produced η decays. The quality of the agreement between theory and existing data between 35 and 100 MeV above threshold does not indicate, at those energies, effects of a possible ηNN quasibound state.

AB - We calculated the differential and total cross sections of the reaction πd→ ηNN near threshold taking into account all the single- and double-scattering graphs within a relativistic formalism. The net effect of the second order diagrams is very small since there is a strong cancellation between the pion-exchange diagram and the sum of the η exchange with the nucleon-nucleon final state interaction diagrams. Our theoretical results are compared with recent experimental data for the differential yield, corresponding to the counting rate for the detection of the two photons into which the produced η decays. The quality of the agreement between theory and existing data between 35 and 100 MeV above threshold does not indicate, at those energies, effects of a possible ηNN quasibound state.

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