# Observation of a resonance in the K$_S$p decay channel at a mass of 1765 Mev/c$^2$

Abstract : We report on the observation of a K$_S$p resonance signal at a mass of 1765 ± 5 MeV/c/$^$2, with intrinsic width Γ = 108 ± 22 MeV/c$^2$, produced inclusively in Σ$^-$-nucleus interactions at 340 GeV/c in the hyperon beam experiment WA89 at CERN. The signal was observed in the kinematic region xF>0.7, in this region its production cross section rises approximately linearly with (1-xF), reaching BR(X→KSp)dσ/dxF=(5.2±2.3)μb per nucleon at xF=0.8. The hard xF spectrum suggests the presence of a strong leading particle effect in the production and hence the identification as a Σ*+ state. No corresponding peaks were observed in the K-p and Λπ± mass spectra.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00142821
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Submitted on : Monday, April 23, 2007 - 9:42:01 AM
Last modification on : Thursday, November 19, 2020 - 12:58:48 PM

### Citation

M.I. Adamovich, Y.A. Alexandrov, S.P. Baranov, D. Barberis, M. Beck, et al.. Observation of a resonance in the K$_S$p decay channel at a mass of 1765 Mev/c$^2$. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2007, 50, pp.535-538. ⟨10.1140/epjc/s10052-007-0284-9⟩. ⟨in2p3-00142821⟩

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