New upper limits for H-particle production in p̄Xe annihilation at low energy

Autor: F. Nichitiu, S.F. Chernukha, Viktor Matveev, C. Petrascu, A. Halsteinslid, N.K. Zombkovskaya, G.V. Davidenko, Yu.V. Trebukhovsky, V.A. Shebanov, V.E. Lukhmanov, T. Jacobsen, A. Haatuft, V.S. Demidov, N.N. Shishov, J.M. Olsen, B.S. Volkov, V.G. Barylov, G.S. Mirosidi, C. Guaraldo, A.G. Meshkovsky, V.V. Barmin, V.M. Golubchikov, V.A. Ergakov, K. Myklebost, K. M. Danielsen, A.A. Sibirtsev, A.G. Dolgolenko
Rok vydání: 1996
Předmět:
Zdroj: Physics Letters B. 370:233-238
ISSN: 0370-2693
DOI: 10.1016/0370-2693(96)00092-5
Popis: A study of the reactions p Xe → K + K + X , p Xe → K + H(H → Σ − p)X and p Xe → K + K + H(H → Σ − p)X was performed using the 700-litre xenon bubble chamber DIANA, exposed to the 1 GeV/ c antiproton beam of ITEP (Moscow). From a sample of 7.8 · 10 5 antiproton annihilations at low energy in xenon nuclei 4 events were observed for the reaction p Xe | → K + K + X at rest ( P p ≤ 400 MeV /c ) and 8 for the same reaction in flight ( 400 ≤ P p ≤ 900 MeV /c ). The corresponding probabilities turned out to be 3.1 · 10 −5 and 3.4 · 10 −5 , respectively. No H -event was found in the two semi-inclusive reactions p Xe → K + HX and p Xe → K + K + HX . This lead to the upper limits 6 · 10 −6 and 8 · 10 −6 (90% C.L.), respectively. The corresponding upper limit for the fully inclusive reaction p Xe → HX turned out to be 1.2 · 10 −5 (90% C.L.), which is about one order of magnitude lower than the actual value reported in the literature.
Databáze: OpenAIRE
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