F. Cossutti et al., TAGGING THE S-QUARK IN HADRONIC DECAYS OF THE Z, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 371(1-2), 1996, pp. 219-222
The DELPHI detector at LEP is equipped with RICH detectors which can b
e exploited for tagging decays of the Z boson into <s(s)over bar> pair
s, High momentum K-+/- identified with the RICH have been used both fo
r a double tag of the s quark and for a single tag using the phi(1020)
meson.