Evidence of elementary processes for hyperon production in low-energy antiproton annihilation on Xenon nuclei

✍ Scribed by V.V. Barmin; V.G. Barylov; V.S. Borisov; G.V. Davidenko; A.G. Dolgolenko; C. Guaraldo; V.A. Matveev; G.S. Mirosidi; K. Myklebost; M. Olsen; C. Petrascu; V.A. Shebanov; N.N. Shishov; A.A. Sibirtsev; L.I. Sokolov; B.S. Volkov; N.K. Zombkovskaya

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 237 KB
• Volume: 683
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(00)00444-9

✦ Synopsis

Hyperon production mechanisms in antiproton annihilation on nuclei at low energy were investigated by using 7.8 × 10 5 annihilations events in the Xe bubble chamber DIANA at P p 0.9 GeV/c. The full kinematical reconstruction of the two-body secondary hyperon production reactions KN→Λπ 0 and ωp→K + Λ was performed and it was found that most of hyperons (about 70%) are produced via the reaction KN → Y X, while the remaining ones come mainly from the ωN → KY X process, in agreement with the predictions of the cascade models. The KN → Λπ 0 and the ωp→K + Λ cross sections were also estimated as further consistency check. The latter, σ K + Λ ω = (0.47 ± 0.25) mb at P ω = 0.42 GeV/c, represents the first experimental determination.