N. Keller

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

We report on a high-statistics search for the {theta}(1540){sup +} resonance in {sigma}{sup -}-nucleus collisions at 340 GeV/c. No evidence for this resonance was found in our data sample which contains 13 million K{sub s}{sup 0}{yields}{pi}{sup +}{pi}{sup -} decays above background. For the decay channel {theta}{sup +}{yields}K{sub s}{sup 0}p and the kinematic range x{sub F}> 0.05, we find the production cross section to be BR({theta}{sup +}{yields}K{sub s}{sup 0}p){sigma}{sub 0}<1.8 {mu}b per nucleon at 99% C.L.

Search for the exotic Ξ--(1860) resonance in 340 GeV/c Σ- -nucleus interactions

We report on a high statistics search for the

Xi- production by Sigma-, pi- and neutrons in the hyperon beam experiment at CERN

Xi^{--}(1860)

V-0, (Xi)over-bar(+) and Omega(-) inclusive production cross sections measured in hyperon experiment WA89 at CERN

resonance in

A measurement of Lambda polarization in inclusive production by Sigma- of 340-GeV/c in C and Cu targets

Sigma^-

First observation of the

-nucleus collisions at 340GeV/c. No evidence for this resonance is found in our data sample which contains 676000

\Xi^{-} \pi^{+}

Xi^-

decay mode of the

candidates above background. For the decay channel

\Xi^{0}(1690)

Xi^{--}(1860) to Xi^-pi^-

hyperon

and the kinematic range 0.15