Searches For Scalar Top And Scalar Bottom Quarks In E(+)E(-) Interactions At 161gev <=Root S <= 183gev

M Acciarri, O Adriani, M Aguilar-Benitez, S Ahlen, J Alcaraz, G Alemanni, J Allaby, A Aloisio,Mg Alviggi, G Ambrosi, H Anderhub,Vp Andreev, T Angelescu, F Anselmo, A Arefiev, T Azemoon, T Aziz, P Bagnaia, L Baksay, S Banerjee, S Banerjee, K Banicz, A Barczyk, R Barillere, L Barone, P Bartalini, A Baschirotto,M Basile, R Battiston, A Bay, F Becattini, U Becker, F Behner,J Berdugo, P Berges, B Bertucci,Bl Betev, S Bhattacharya, M Biasini, A Biland,Gm Bilei,Jj Blaising,Sc Blyth,Gj Bobbink, R Bock, A Bohm, L Boldizsar, B Borgia, D Bourilkov, M Bourquin, S Braccini,Jg Branson, V Brigljevic,Ic Brock, A Buffini, A Buijs,Jd Burger,Wj Burger, J Busenitz, A Button,Xd Cai, M Campanelli, M Capell,Gc Romeo,G Carlino,Am Cartacci, J Casaus, G Castellini, F Cavallari, N Cavallo, C Cecchi, M Cerrada, F Cesaroni, M Chamizo,Yh Chang,Uk Chaturvedi, M Chemarin, A Chen,G Chen,Gm Chen,Hf Chen,Hs Chen, X Chereau, G Chiefari,Cy Chien, L Cifarelli, F Cindolo, C Civinini, I Clare, R Clare, G Coignet,Ap Colijn, N Colino, S Costantini, F Cotorobai,B De La Cruz, A Csilling,Ts Dai, R D'Alessandro,R De Asmundis, A Degre, K Deiters, D Della Volpe, P Denes, F Denotaristefani, M Diemoz,D Van Dierendonck, F Di Lodovico, C Dionisi, M Dittmar, A Dominguez, A Doria,Mt Dova, D Duchesneau, P Duinker, I Duran, S Easo,H El Mamouni, A Engler,Fj Eppling,Fc Erne, P Extermann, M Fabre, R Faccini,Ma Falagan, S Falciano, A Favara, J Fay, O Fedin, M Felcini, T Ferguson, F Ferroni, H Fesefeldt, E Fiandrini,Jh Field, F Filthaut,Ph Fisher, I Fisk, G Forconi, L Fredj, K Freudenreich, C Furetta, Y Galaktionov,Sn Ganguli, P Garcia-Abia, M Gataullin,Ss Gau, S Gentile, N Gheordanescu,S Giagu,S Goldfarb, J Goldstein,Zf Gong, A Gougas, G Gratta,Mw Gruenewald,R Van Gulik,Vk Gupta, A Gurtu,Lj Gutay, D Haas, B Hartmann, A Hasan, D Hatzifotiadou, T Hebbeker, A Herve, P Hidas, J Hirschfelder,Wc Van Hoek, H Hofer, H Hoorani,Sr Hou, G Hu, I Iashvili,Bn Jin,Lw Jones, P De Jong, I Josa-Mutuberria,Ra Khan, D Kamrad,Js Kapustinsky, M Kaur,Mn Kienzle-Focacci,D Kim,Dh Kim,Jk Kim,Sc Kim,Ww Kinnison, A Kirkby, D Kirkby, J Kirkby, D Kiss, W Kittel, A Klimentov,Ac Konig, A Kopp, I Korolko, V Koutsenko,Rw Kraemer, W Krenz, A Kunin, P Lacentre,Pl De Guevara, I Laktineh, G Landi, C Lapoint, K Lassila-Perini, P Laurikainen, A Lavorato, M Lebeau, A Lebedev, P Lebrun, P Lecomte, P Lecoq,P Le Coultre,Hj Lee,Jm Le Goff, R Leiste, E Leonardi, P Levtchenko, C Li,Ch Lin,Wt Lin,Fl Linde, L Lista,Za Liu, W Lohmann, E Longo, W Lu,Ys Lu, K Lubelsmeyer, C Luci, D Luckey, L Luminari, W Lustermann,Wg Ma, M Maity, G Majumder, L Malgeri, A Malinin, C Mana, D Mangeol, P Marchesini, G Marian, A Marin,Jp Martin, F Marzano,Ggg Massaro, K Mazumdar,Rr Mcneil,S Mele, L Merola, M Meschini,Wj Metzger,M Von Der Mey, D Migani, A Mihul, Ajw Van Mil, H Milcent, G Mirabelli, J Mnich, P Molnar, B Monteleoni, R Moore, T Moulik, R Mount,Gs Muanza, F Muheim,Ajm Muijs, S Nahn, M Napolitano, F Nessi-Tedaldi, H Newman, T Niessen, A Nippe, A Nisati, H Nowak,Yd Oh, G Organtini, R Ostonen, C Palomares, D Pandoulas, S Paoletti, P Paolucci,Hk Park,Ih Park, G Pascale, G Passaleva, S Particelli, T Paul, M Pauluzzi, C Paus, F Pauss, D Peach, M Pedace,Yj Pei, S Pensotti, D Perret-Gallix, B Petersen, S Petrak, A Pevsner, D Piccolo, M Pieri,Pa Piroue, E Pistolesi, V Plyaskin, M Pohl, V Pojidaev, H Postema, J Pothier, N Produit, D Prokofiev, J Quartieri, G Rahal-Callot, N Raja,Pg Rancoita, M Rattaggi, G Raven, P Razis, D Ren, M Rescigno, S Reucroft,T Van Rhee, S Riemann, K Riles, A Robohm, J Rodin,Bp Roe, L Romero, S Rosier-Lees, S Roth,Ja Rubio, D Ruschmeier, H Rykaczewski, S Sakar, J Salicio, E Sanchez,Mp Sanders,Me Sarakinos, C Schafer, V Schegelsky, S Schmidt-Kaerst, D Schmitz, N Scholz, H Schopper,Dj Schotanus, J Schwenke, G Schwering, C Sciacca, D Sciarrino, L Servoli, S Shevchenko, N Shivarov, V Shoutko, J Shukla, E Shumilov, A Shvorob, T Siedenburg, D Son, B Smith, P Spillantini, M Steuer,Dp Stickland, A Stone, H Stone, B Stoyanov, A Straessner, K Sudhakar, G Sultanov,Lz Sun,Gf Susinno, H Suter,Jd Swain,Xw Tang, L Tauscher, L Taylor, C Timmermans,Scc Ting,Sm Ting,Sc Tonwar, J Toth, C Tully,Kl Tung, Y Uchida, J Ulbricht, E Valente, G Vesztergombi, I Vetlitsky, G Viertel, S Villa, M Vivargent, S Vlachos, H Vogel, H Vogt, I Vorobiev,Aa Vorobyov, A Vorvolakos, M Wadhwa, W Wallraff,Jc Wang,Xl Wang,Zm Wang, A Weber,Sx Wu, S Wynhoff, J Xu,Zz Xu,Bz Yang,Cg Yang,Hj Yang, M Yang,Jb Ye,Sc Yeh,Jm You, A Zalite, Y Zalite, P Zemp, Y Zeng,Zp Zhang, B Zhou,Gy Zhu,Ry Zhu, A Zichichi, F Ziegler, G Zilizi

PHYSICS LETTERS B（1999）

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摘要

Searches for scalar top and scalar bottom quarks have been performed at center-of-mass energies between 161 GeV and 183 GeV using the L3 detector at LEP. No signal is observed. Model-independent limits on production cross sections are determined for the two decay channels (t) over tilde --> c<(chi)over tilde>(0)(1) and (b) over tilde(1) --> b<(chi)over tilde>(0)(1). Within the framework of the Minimal Supersymmetric extension of the Standard Model mass limits are derived. For mass differences between (t) over tilde(1) and <(chi)over tilde>(0)(1) greater than 10 GeV a 95% C.L. limit of 81.5 GeV is set on the mass of the Supersymmetric partner of the left-handed top. A supersymmetric partner of the left-handed bottom with a mass below 80 GeV is excluded at 95% C.L. if the mass difference between bl and <(chi)over tilde>(0)(1) is greater than 20 GeV. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

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