Observation of a narrow baryon resonance decaying to pK 0S in proton-nucleus interactions at 70 GeV/c with the SVD-2 setup
Year: 2005
Type: article
Abstract: Data from the SVD-2 experiment that were obtained at the IHEP accelerator in 70-GeV/c proton-nucleus interactions are analyzed with the aim of searches for an exotic Θ+ baryon that decays through the pK S 0 channel. The reaction pN → pK S 0 + X characterized by a bounded multiplicity of charged secondaries is used for this analysis. A resonance of mass M = 1526 ± 3(stat.) ± 3(syst.) MeV/c 2 and width Γ < 24 MeV/c 2 is observed in the invariant-mass spectrum of the pK S 0 system at a statistical significance of 5.6σ. The mass and the width of this resonance correspond to the recently found positive-strangeness Θ+ baryon, which was predicted to be an exotic baryon consisting of five quarks (pentaquark), $$uudd\bar s$$ . The total cross section for the production of a Θ+ baryon in pA interactions is estimated at a value within the range 30–120 μb for x F ≥ 0. An analysis of the A dependence of the cross section for Θ+-baryon production does not reveal a significant deviation from the A dependence for inelastic events (∼A 0.7).
Source: Physics of Atomic Nuclei
DOI: 10.1134/1.1954823
Authors: A. N. Aleev, N. S. Amaglobeli, E. N. Ardashev, V. P. Balandin, S. G. Basiladze, S. F. Berezhnev, G. A. Bogdanova, I. V. Boguslavsky, M. V. Vasiliev, A. M. Vischnevskaya, V. Yu. Volkov, A. P. Vorobiev, A. G. Voronin, S. N. Golovnya, S. A. Golubkov, S. A. Gorokhov, A. V. Gorkov, I. M. Gramenitsky, N. I. Grishin, Ya. V. Grishkevich, N. N. Egorov, V. B. Ezhov, G. G. Ermakov, P. F. Ermolov, N. K. Zhidkov, L. L. Zakamsky, V. N. Zapolsky, E. G. Zverev, V. V. Zmushko, D. S. Zotkin, S. A. Zotkin, D. E. Karmanov, A. A. Kiryakov, V. V. Kozlov, Yu. F. Kozlov, E. S. Kokoulina, N. V. Korotkov, I. G. Kosarev, V. A. Kramarenko, A. V. Kubarovsky, E. N. Kuznetsov, N. A. Kuzmin, V. A. Kuzmin, L. L. Kurchaninov, G. I. Lanshikov, A. N. Larichev, M. S. Levitsky, A. K. Leflat, S. I. Lyutov, S. V. Maiorov, M. M. Merkin, A. A. Minaenko, G. Ya. Mitrofanov, A. M. Moiseev, V. S. Murzin, V. A. Nikitin, P. P. Nomokonov, A. A. Oleinik, S. V. Orfanitsky, V. V. Parakhin, V. S. Petrov, L. V. Pilavova, A. V. Pleskach, V. V. Popov, R. E. Rudenko, I. A. Rufanov, V. N. Riadovikov, V. A. Senko, A. I. Sidorov, M. M. Soldatov, L. A. Tikhonova, T. P. Topuria, N. F. Furmanec, A. G. Kholodenko, Yu. P. Tsyupa, N. A. Shalanda, M. D. Shafranov, A. I. Yukaev, V. I. Yakimchuk
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2066868942