Total cross section of the pp→pp η reaction near threshold

A. M. Bergdolt, G. Bergdolt, O. Bing, A. Bouchakour, F. Brochard, F. Hibou, A. Moalem, A. Taleb, M. P. Combes-Comets, P. Courtat, R. Gacougnolle, Y. Le Bornec, E. Loireleux, F. Reide, B. Tatischeff, N. Willis, M. Boivin, B. M.K. Nefkens, F. Plouin

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122 Scopus citations


The pp→pp η reaction is studied at energies near the η production threshold. The total cross sections at nominal machine energies of 1260, 1265, and 1300 MeV are 90±15, 790±120, and 3460±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 η-pp scattering length.

Original languageEnglish
Pages (from-to)R2969-R2973
JournalPhysical Review D
Issue number7
StatePublished - 1 Jan 1993

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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