Total cross section of the <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>pp</mi><mo>→</mo><mi>pp</mi><mi></mi><mi>η</mi></math></span> 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

doi:10.1103/PhysRevD.48.R2969

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Total cross section of the $pp \to pp η$ 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, and F. Plouin

Phys. Rev. D 48, R2969(R) – Published 1 October 1993

Abstract

The $pp \to pp η$ 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 $η - p p$ scattering length.

Received 25 January 1993

DOI:https://doi.org/10.1103/PhysRevD.48.R2969

Authors & Affiliations

A. M. Bergdolt¹, G. Bergdolt¹, O. Bing¹, A. Bouchakour¹, F. Brochard¹, F. Hibou¹, A. Moalem^1,2, A. Taleb¹, M. P. Combes-Comets³, P. Courtat³, R. Gacougnolle³, Y. Le Bornec³, E. Loireleux³, F. Reide³, B. Tatischeff³, N. Willis³, M. Boivin⁴, B. M. K. Nefkens^4,5, and F. Plouin⁴

¹Centre de Recherches Nucléaires, Université Louis Pasteur, B.P. 20, Institut National de Physique Nucléaire et de Physique des Particules—Centre National de la Recherche Scientifique, F-67037 Strasbourg CEDEX, France
²Department of Physics, Ben Gurion University, 84105 Beer Sheva, Israel
³Institut de Physique Nucléaire, F-91406 Orsay CEDEX, France
⁴Laboratoire National Saturne, Centre d'Etudes Nucléaires de Saclay, F-91191 Gif-sur-Yvette, France
⁵Department of Physics, University of California at Los Angeles, Los Angeles, California 90024

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Vol. 48, Iss. 7 — 1 October 1993

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