D. Z. Toet and G. W. , Transtromer 24Van Apeldoorn 30 , P .Van Dam 30 , J.Van Eldik 30 , A.Van Lysebetten 2 , I.Van Vulpen 30, Ueberschaer 52 , O.Ullaland 9 , V.Uvarov 42 , G.Valenti 5 , E.Vallazza 46

B. Wilrijk, I. Ulb-vub, S. Pleinlaan-o-f-a-thens, I. Str, I. Fr-75231 et al., IT-40126 Bologna, Italy 6 Centro Brasileiro de Pesquisas F sicas, rua Xavier Sigaud 150 GR-15310 Athens, Greece 12 FZU, Inst. of Phys DE-76128 Karlsruhe, Germany 18 Institute of Nuclear Physics and University of Mining and Metalurgy, Ul. Kawiory 26a, PL-30055 Krakow FR-91405 Orsay Cedex, France 20 School of Physics and Chemistry Elias Garcia, 14-1 o , PT-1000 Lisboa Codex, Portugal 22 Department o f P h ysics Calvo Sotelo s/n, ES-33007 Oviedo, Spain 34 Department o f P h ysics a d i P adova and INFN, Via Marzolo 8, IT-35131 Padua a d i T rieste and INFN, Via A, GR-10680 Athens 11 Institute of Nuclear Physics High Energy Physics Division, Na Slovance 2, CZ-180 40, Praha 8, Czech Republic 13 Dipartimento di Fisica, Universit a di Genova and INFN, Via Dodecaneso 33, IT-16146 Genova, Italy 14 Institut des Sciences Nucl eaires, IN2P3-CNRS, Universit e de Grenoble 1, FR-38026 Grenoble Cedex, France 15 Helsinki Institute of Physics, HIP, P .O. Box 9, FI-00014 Helsinki, Finland 16 Joint Institute for Nuclear Research, Dubna, Head Post Oce, P.O. Box 79, RU-101 000 Moscow, Russian Federation 17 Institut f ur Experimentelle Kernphysik The Netherlands 31 National Technical University, P h ysics Department, Zografou Campus, GR-15773 Athens, Greece 32 Physics DepartmentMoscow Region), Russian Federation 43 J. Stefan Institute, Jamova 39, SI-1000 Ljubljana-5000 Slovenia, and Department o f P h ysics Ilha do Fund~ ao BR-21945-970 Rio de Janeiro Spain 50 Institut f ur Hochenergiephysik, Osterr. Akad. d. Wissensch., Nikolsdorfergasse 18, AT-1050 Vienna, Austria 51 Inst. Nuclear Studies and University o f W arsaw 53 On leave of absence from IHEP Serpukhov 54 Now at University of Florida References [1] \Searches for new Physics" G.F.Giudice et al, pp.50011-3160, 22363.

. Particles, . Interactions-"-a, J. Djouadi, T. G. Ng, and . Rizzo, SLAC-PUB-95-6772, to appear as a chapter, \Electroweak symmetry breaking and beyond the Standard Model, 1995.

K. Hagiwara, S. Komamiya, D. Zeppenfeld, Z. Phys, F. Boudjema et al., C29 (1985) 115, Z. Phys, pp.57-425, 1993.

". \exotic-fermions and D. London, Precision Tests of the Standard Model, 1993.

T. Sj-ostrand and . Comp, High-energy-physics event generation with PYTHIA 5.7 and JETSET 7.4, Computer Physics Communications, vol.82, issue.1, p.74, 1994.
DOI : 10.1016/0010-4655(94)90132-5

F. A. Berends, P. H. Daverveldt, R. Kleiss, and . Comp, Monte Carlo simulation of two-photon processes, Computer Physics Communications, vol.40, issue.2-3, p.271, 1986.
DOI : 10.1016/0010-4655(86)90114-1

A. L. Read, \Optimal statistical analysis of search results based on the likelihood ratio and its application to the search for the MSM Higgs boson at p s=161 and 172