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Observation of narrow baryon resonance decaying into $pK^0_s$ in pA-interactions at $70 GeV/c$ with SVD-2 setup

SVD Collaboration
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Abstract

SVD-2 experiment data have been analyzed to search for an exotic baryon state, the $Θ^+$-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 $Γ< 24 MeV/c^2$. The statistical significance of this peak was estimated to be of $5.6 σ$. The mass and width of the resonance is compatible with the recently reported $Θ^+$- baryon with positive strangeness which was predicted as an exotic pentaquark ($uudd\bar{s}$) baryon state. The total cross section for $Θ^+$ production in pN-interactions for $X_F\ge 0$ was estimated to be $(30\div120) μb$ and no essential deviation from A-dependence for inelastic events $(\sim A^{0.7})$ was found.

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SVD Collaboration. 2004-02-05. Observation of narrow baryon resonance decaying into $pK^0_s$ in pA-interactions at $70 GeV/c$ with SVD-2 setup. https://doi.org/10.1134/1.1954823

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