Rob G. E. Timmermans

Chiral two-pion exchange and proton-proton partial-wave analysis

Published in: Phys. Rev. Lett. 82 (1999) 4992-4995 Citing articles (CrossRef) citations recorded in [Science Citation Index] Abstract: The chiral two-pion exchange component of the long-range pp interaction is studied in an energy-dependent partial-wave analysis. We demonstrate its presence and importance, and determine the chiral parameters c_i (i=1,3,4). The values agree well with those obtained from pion-nucleon amplitudes.

PION-NUCLEON COUPLING-CONSTANT

In view of the persisting misunderstandings about the determination of the pion-nucleon coupling constants in the Nijmegen multienergy partial-wave analyses of [ital pp], [ital np], and [ital [bar p]p] scattering data, we present additional information which may clarify several points of discussion. We comment on several recent papers addressing the issue of the pion-nucleon coupling constant and criticizing the Nijmegen analyses.

Strangeness exchange in proton-antiproton reactions

Results are presented of a coupled channels P -matrix model describing the reactions pp → Y Y . An antibaryon-baryon potential is constructed with the use of SU(3) symmetry. Special attention is given to the influence of the different strange mesons and their coupling constants. The existing experimental data on the reactions pp → ΛΛ and pp → ΛΣ0 + Σ0Λ are very well reproduced. Typeset using REVTEX ∗Published in Nucl. Phys. A479, 383c–388c (1988), Contribution to the Conference on Strangeness in Hadronic Matter, Bad Honnef (Germany), June 1987

Determination of the ΛpK coupling constant from LEAR data on p̄p→ΛΛ

Abstract From recent high quality data taken at LEAR on the strangeness-exchange reaction p p→ Λ Λ we could determine the ΛpK coupling constant at the kaon pole. The value found is fΛpK2 = 0.071±0.007 or equivalently gΛpK2 = 15.4±1.5. Using SU(3) symmetry for the pseudovector coupling constants we find for the ratio α = F/(F + D) the value αPV = 0.34±0.04, in excellent agreement with the value α = 0.355±0.006 as obtained from weak semileptonic baryon decays.

Hyperon-nucleon scattering

SummaryThe Nijmegen soft-core potential model is discussed in the context of modern views in strong interactions. TheNN version of this model is compared with some other, the so-called realisticNN potentials. A nice feature of this potential model is that it can easily be extended to the YN channels usingSU(3). It will be shown that the YN version of this model gives a high-quality fit to the existing experimental YN data. Not only the scattering data are described very well, but also the capture ratio at rest is very good, and theF/(F+D) ratioαPS for the PV-coupling of the pseudoscalar mesons used in this model, could be kept in perfect agreement with the value from the weak interactions. Finally the reaction

HYPERON - NUCLEON SCATTERING

\bar p

A study of the reaction p̄p→Λ̄Λ

p→