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Search for the pentaquark candidate $Θ^+$(1540) in the hyperon beam experiment WA89

M. I. Adamovich
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Abstract

We report on a high-statistics search for the \t1540 resonance in $Σ^-$-nucleus collisions at 340 \gevc1 . No evidence for this resonance was found in our data sample which contains 13 millions $K^0_s \to π^+π^- $ decays above background. For the decay channel $Θ^+ \to K^0_s p$ and the kinematic range $x_F>$ 0.05 we find the production cross section to be $BR(Θ^+ \to K^0_s p)\cdot σ_0 <$ 1.8 $μ$b per nucleon at 99% CL.

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M. I. Adamovich. 2005-10-05. Search for the pentaquark candidate $Θ^+$(1540) in the hyperon beam experiment WA89. https://doi.org/10.1103/physrevc.72.055201

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