Total cross section of the [ital pp][r arrow][ital pp][eta] reaction near threshold

• Published in: Physical review. D, Particles and fields Particles and fields, 1993-10, Vol.48:7
• Main Authors: Bergdolt, A.M., Bergdolt, G., Bing, O., Bouchakour, A., Brochard, F., Hibou, F., Moalem, A., Taleb, A., Combes-Comets, M.P., Courtat, P., Gacougnolle, R., Le Bornec, Y., Loireleux, E., Reide, F., Tatischeff, B., Willis, N., Boivin, M., Nefkens, B.M.K., Plouin, F.
• Format: Article
• Language: English
• Subjects: 662420 > Properties of Mesons & Meson Resonances-- (1992-); 663430 > Nucleon-Induced Reactions & Scattering-- (1992-); BARYON REACTIONS; BARYON-BARYON INTERACTIONS; BOSONS; CHARGED-PARTICLE REACTIONS; CROSS SECTIONS; DIMENSIONS; ELEMENTARY PARTICLES; ENERGY; ENERGY DEPENDENCE; ETA MESONS; HADRON REACTIONS; HADRON-HADRON INTERACTIONS; HADRONS; INTERACTIONS; LENGTH; MATHEMATICAL SPACE; MESONS; NUCLEAR PHYSICS AND RADIATION PHYSICS; NUCLEAR REACTIONS; NUCLEON REACTIONS; NUCLEON-NUCLEON INTERACTIONS; PARTICLE INTERACTIONS; PHASE SPACE; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; PROTON REACTIONS; PROTON-NUCLEON INTERACTIONS; PROTON-PROTON INTERACTIONS; PSEUDOSCALAR MESONS; SCATTERING LENGTHS; SPACE 662340 > Hadron Interactions-- (1992-); THRESHOLD ENERGY; TOTAL CROSS SECTIONS
• ISSN: 0556-2821; 1089-4918
• DOI: 10.1103/PhysRevD.48.R2969

The [ital pp][r arrow][ital pp][eta] reaction is studied at energies near the [eta] production threshold. The total cross sections at nominal machine energies of 1260, 1265, and 1300 MeV are 90[plus minus]15, 790[plus minus]120, and 3460[plus minus]690 nb, respectively. None of the existing perturbative model calculations reproduces the energy dependence, which deviates strongly from phase space. This suggests that the cross section is enhanced in the near vicinity of the production threshold by a large [eta]-[ital pp] scattering length.