Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2004-01-16
Phys.Atom.Nucl.68:974-981,2005; Yad.Fiz.68:1012-1019,2005
Physics
High Energy Physics
High Energy Physics - Experiment
8 pages, 7 figures, To be submitted to Yadernaya Fizika. v3-v5 - Some references added, minor typos corrected
Scientific paper
10.1134/1.1954823
SVD-2 experiment data have been analyzed to search for an exotic baryon state, the $\Theta^+$-baryon, in a $pK^0_s$ decay mode at $70 GeV/c$ on IHEP accelerator. The reaction $pA \to pK^0_s+X$ with a limited multiplicity was used in the analysis. The $pK^0_s$ invariant mass spectrum shows a resonant structure with $M=1526\pm3(stat.)\pm 3(syst.) MeV/c^2$ and $\Gamma < 24 MeV/c^2$. The statistical significance of this peak was estimated to be of $5.6 \sigma$. The mass and width of the resonance is compatible with the recently reported $\Theta^+$- baryon with positive strangeness which was predicted as an exotic pentaquark ($uudd\bar{s}$) baryon state. The total cross section for $\Theta^+$ production in pN-interactions for $X_F\ge 0$ was estimated to be $(30\div120) \mu b$ and no essential deviation from A-dependence for inelastic events $(\sim A^{0.7})$ was found.
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