High resolution study of the two-baryons-system with strangeness - 1 by means of the reaction pp → K⁺X

• Auteur / Autrice : Rainer Siebert
• Direction : Jürgen Ernst, Robert Frascaria
• Type : Thèse de doctorat
• Discipline(s) : Physique
• Date : Soutenance en 1989
• Etablissement(s) : Paris 11 en cotutelle avec Rheinische Friedrich-Wilhelms-Universität (Bonn, Allemagne)
• Partenaire(s) de recherche : Laboratoire : Institut de physique nucléaire (Orsay, Essonne ; 1956-2019)
• Partenaire(s) de recherche : autre partenaire : Université de Paris-Sud. Faculté des sciences d'Orsay (Essonne)

Mots clés

Mots clés contrôlés

Spectromètres magnétiques

Protons -- Diffusion

Baryons

Kaons

Mots clés libres

SPES 4 (spectomètre magnétique)

Synchrotron Saturne

Résumé

The inclusive reaction pp → K⁺X was studied in the missing mass range 2050-2160 MeV/c². The bombarding energy was 2300 MeV. Kaons were detected at four forward angles between 6° and 12 ° using the magnetic spectrometer SPES 4 at the Laboratoire National Saturn. Kaon identification was performed with four total plane of the spectrometer. All spectra show a strong final-state enhancmeent of the doule differential cross section near the Λp-threshold and a sharp peak anomaly at 2131 ± 1. 5 MeV/c² close to the ΣN thresholds with a width of 9 ± 1 MeV/c² and a production cross section of 0. 5 μb/sr. The anomaly is discussed with respect to the strange ( S = -1) analog state of the deuteron, the H⁺₁state. Quark model predictions of narrow dibaryon states Ds et Dt have not been observed. Upper limits for the productions cross section between 15 and 30/nb/s are reduced.