TY - JOUR
T1 - The reaction pp→ppη and the eta-nucleon and nucleon-nucleon interactions
AU - Peña, M. T.
AU - Garcilazo, H.
AU - Riska, D. O.
N1 - Funding Information:
D.O.R. thanks Dr. L. Tiator for instructive discussions. This work was supported in part by COFAA-IPN (México) and by Fundação para a Ciência e a Tecnologia, MCT (Portugal) under contracts PRAXIS XXI/BCC/18975/98 and PRAXIS/P/FIS/10031/1998 and in part by the Academy of Finland by grants No. 43982 and 44903.
PY - 2001/2/26
Y1 - 2001/2/26
N2 - The π, η and ρ exchange contributions to the cross section for the reaction pp→ppη near threshold are calculated, with a phenomenological description of the intermediate S11 (N(1535)) resonance for all exchange mechanisms. The final state interaction in the pp system is described by realistic nucleon-nucleon interaction models. The sensitivity of the results to the phenomenological models for the η-nucleon transition amplitude and the nucleon-nucleon interaction is explored. The η-exchange mechanism is found to play a dominant role. The off-shell behavior of the ηN→ηN amplitude within the η exchange amplitude leads to a result significantly different from that obtained with the constant scattering length approximation. The two-nucleon amplitudes that are associated with the short-range components of the nucleon-nucleon interaction contribute significantly to the cross section.
AB - The π, η and ρ exchange contributions to the cross section for the reaction pp→ppη near threshold are calculated, with a phenomenological description of the intermediate S11 (N(1535)) resonance for all exchange mechanisms. The final state interaction in the pp system is described by realistic nucleon-nucleon interaction models. The sensitivity of the results to the phenomenological models for the η-nucleon transition amplitude and the nucleon-nucleon interaction is explored. The η-exchange mechanism is found to play a dominant role. The off-shell behavior of the ηN→ηN amplitude within the η exchange amplitude leads to a result significantly different from that obtained with the constant scattering length approximation. The two-nucleon amplitudes that are associated with the short-range components of the nucleon-nucleon interaction contribute significantly to the cross section.
UR - http://www.scopus.com/inward/record.url?scp=0035952378&partnerID=8YFLogxK
U2 - 10.1016/S0375-9474(00)00449-8
DO - 10.1016/S0375-9474(00)00449-8
M3 - Artículo
SN - 0375-9474
VL - 683
SP - 322
EP - 338
JO - Nuclear Physics, Section A
JF - Nuclear Physics, Section A
IS - 1-4
ER -