Observation of a resonance in the K$_s$p decay channel at a mass of 1765 MeV/c$^2$

Details Observation of a resonance in the K$_s$p decay channel at a mass of 1765 MeV/c$^2$ Observation of a resonance in the K$_s$p decay channel at a mass of 1765 MeV/c$^2$

2007-02-27

arxiv.org/abs/hep-ex/0702044v1

Eur.Phys.J.C50:535-538,2007

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1140/epjc/s10052-007-0284-9

We report on the observation of a K$_s$p resonance signal at a mass of 1765$\pm$5 MeV/c$^2$, with intrinsic width $\Gamma = 108\pm 22$ MeV/c$^2$, produced inclusively in $\Sigma^-$-nucleus interactions at 340 GeV/c in the hyperon beam experiment WA89 at CERN. The signal was observed in the kinematic region $x_F>0.7$, in this region its production cross section rises approximately linearly with $(1-x_F)$, reaching $BR(X\to K_S p)\cdot d\sigma /dx_F = (5.2\pm 2.3) \mu b $ per nucleon at $x_F=0.8$. The hard \xf spectrum suggests the presence of a strong leading particle effect in the production and hence the identification as a $\Sigma^{*+}$ state. No corresponding peaks were observed in the $K^- p$ and $\Lambda \pi^{\pm}$ mass spectra.

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