Searches for scalar top and bottom quarks have been performed with data collected by the ALEPH detector at LEP. The data sample consists of 21.7 pb(-1) taken at root s = 161, 170, and 172 GeV and 5.7 pb(-1) taken at root s = 130 and 136 GeV. No evidence for scalar top quarks or scalar bottom quarks was found in the channels (t) over tilde --> c chi, (t) over tilde --> bl<(nu)over tilde>, and (b) over tilde --> b chi. For the channel (t) over tilde --> c chi a limit of 67 GeV/c(2) has been set on the scalar top quark mass, independent of the mixing angle between the supersymmetric partners of the left and right-handed states of the top quark. This limit assumes a mass difference between the (t) over tilde and the chi of at least 10 GeV/c(2). For the channel (t) over tilde --> bl<(nu)over tilde> the mixing-angle independent scalar top limit is 70 GeV/c(2), assuming a mass difference between the (t) over tilde and the <(nu)over tilde> of at least 10 GeV/c(2). For the channel (b) over tilde --> b chi, a limit of 73 GeV/c(2) has been set on the mass of the supersymmetric partner of the left-handed state of the bottom quark. This limit is valid if the mass difference between the (b) over tilde and the chi is at least 10 GeV/c(2).

Searches for scalar top and scalar bottom quarks at LEP2 / Barate, R; Buskulic, D; Decamp, D; Ghez, P; Goy, C; Lees, Jp; Lucotte, A; Minard, Mn; Nief, Jy; Pietrzyk, B; Casado, Mp; Chmeissani, M; Comas, P; Crespo, Jm; Delfino, M; Fernandez, E; Fernandez Bosman, M; Garrido, L; Juste, A; Martinez, M; Merino, G; Miquel, R; Mir, Lm; Padilla, C; Park, Ic; Pascual, A; Perlas, Ja; Riu, I; Sanchez, F; Teubert, F; Colaleo, A; Creanza, Donato Maria; de Palma, M; Gelao, G; Iaselli, Giuseppe; Maggi, Giorgio Pietro; Maggi, M; Marinelli, N; Nuzzo, S; Ranieri, A; Raso, G; Ruggieri, F; Selvaggi, G; Silvestris, L; Tempesta, P; Tricomi, A; Zito, G; Huang, X; Lin, J; Ouyang, Q; Wang, T; Xie, Y; Xu, R; Xue, S; Zhang, J; Zhang, L; Zhao, W; Abbaneo, D; Alemany, R; Bazarko, Ao; Becker, U; Bright Thomas, P; Cattaneo, M; Cerutti, F; Dissertori, G; Drevermann, H; Forty, Rw; Frank, M; Hagelberg, R; Hansen, Jb; Harvey, J; Janot, P; Jost, B; Kneringer, E; Knobloch, J; Lehraus, I; Mato, P; Minten, A; Moneta, L; Pacheco, A; Pusztaszeri, Jf; Ranjard, F; Rizzo, G; Rolandi, L; Rousseau, D; Schlatter, D; Schmitt, M; Schneider, O; Tejessy, W; Tomalin, Ir; Wachsmuth, H; Wagner, A; Ajaltouni, Z; Barres, A; Boyer, C; Falvard, A; Ferdi, C; Gay, P; Guicheney, C; Henrard, P; Jousset, J; Michel, B; Monteil, S; Montret, Jc; Pallin, D; Perret, P; Podlyski, F; Proriol, J; Rosnet, P; Rossignol, Jm; Fearnley, T; Hansen, Jd; Hansen, Jr; Hansen, Ph; Nilsson, Bs; Rensch, B; Waananen, A; Daskalakis, G; Kyriakis, A; Markou, C; Simopoulou, E; Vayaki, A; Blondel, A; Brient, Jc; Machefert, F; Rouge, A; Rumpf, M; Valassi, A; Videau, H; Focardi, E; Parrini, G; Zachariadou, K; Cavanaugh, R; Corden, M; Georgiopoulos, C; Huehn, T; Jaffe, De; Antonelli, A; Bencivenni, G; Bologna, G; Bossi, F; Campana, P; Capon, G; Casper, D; Chiarella, V; Felici, G; Laurelli, P; Mannocchi, G; Murtas, F; Murtas, Gp; Passalacqua, L; Pepe Altarelli, M; Curtis, L; Dorris, Sj; Halley, Aw; Knowles, Ig; Lynch, Jg; O'Shea, V; Raine, C; Scarr, Jm; Smith, K; Teixeira Dias, P; Thompson, As; Thomson, E; Thomson, F; Turnbull, Rm; Buchmuller, O; Dhamotharan, S; Geweniger, C; Graefe, G; Hanke, P; Hansper, G; Hepp, V; Kluge, Ee; Putzer, A; Sommer, J; Tittel, K; Werner, S; Wunsch, M; Beuselinck, R; Binnie, Dm; Cameron, W; Dornan, Pj; Giorne, M; Goodsir, S; Martin, Eb; Morawitz, P; Moutoussi, A; Nash, J; Sedgbeer, Jk; Spagnolo, P; Stacey, Am; Williams, Md; Ghete, Vm; Girtler, P; Kuhn, D; Rudolph, G; Betteridge, Ap; Bowdery, Ck; Colrain, P; Crawford, G; Finch, Aj; Foster, F; Hughes, G; Jones, Rwl; Sloan, T; Whelan, Ep; Williams, Mi; Hoffmann, C; Jakobs, K; Kleinknecht, K; Quast, G; Renk, B; Rohne, E; Sander, Hg; van Gemmeren, P; Zeitnitz, C; Aubert, Jj; Benchouk, C; Bonissent, A; Bujosa, G; Carr, J; Coyle, P; Diaconu, C; Ealet, A; Fouchez, D; Konstantinidis, N; Leroy, O; Motsch, F; Payre, P; Talby, M; Sadouki, A; Thulasidas, M; Tilquin, A; Trabelsi, K; Aleppo, M; Antonelli, M; Ragusa, F; Berlich, R; Blum, W; Buscher, V; Dietl, H; Ganis, G; Gotzhein, C; Kroha, H; Lutjens, G; Lutz, G; Manner, W; Moser, Hg; Richter, R; Rosado Schlosser, A; Schael, S; Settles, R; Seywerd, H; St Denis, R; Stenzel, H; Wiedenmann, W; Wolf, G; Boucrot, J; Callot, O; Chen, S; Cordier, A; Davier, M; Duflot, L; Grivaz, Jf; Heusse, P; Hocker, A; Jacholkowska, A; Jacquet, M; Kim, Dw; Le Diberder, F; Lefrancois, J; Lutz, Am; Nikolic, I; Schune, Mh; Serin, L; Simion, S; Tournefier, E; Veillet, Jj; Videau, I; Zerwas, D; Azzurri, P; Bagliesi, G; Bettarini, S; Bozzi, C; Calderini, G; Ciulli, V; Dell'Orso, R; Fantechi, R; Ferrante, I; Giassi, A; Gregorio, A; Ligabue, F; Lusiani, A; Marrocchesi, Ps; Messineo, A; Palla, F; Sanguinetti, G; Sciaba, A; Sguazzoni, G; Steinberger, J; Tenchini, R; Vannini, C; Venturi, A; Verdini, Pg; Blair, Ga; Bryant, Lm; Chambers, Jt; Gao, Y; Green, Mg; Medcalf, T; Perrodo, P; Strong, Ja; von Wimmersperg Toeller, Jh; Botterill, Dr; Clifft, Rw; Edgecock, Tr; Haywood, S; Maley, P; Norton, Pr; Thompson, Jc; Wright, Ae; Bloch Devaux, B; Colas, P; Fabbro, B; Kozanecki, W; Lancon, E; Lemaire, Mc; Locci, E; Perez, P; Rander, J; Renardy, Jf; Rosowsky, A; Roussarie, A; Schuller, Jp; Schwindling, J; Trabelsi, A; Vallage, B; Black, Sn; Dann, Jh; Kim, Hy; Litke, Am; Mcneil, Ma; Taylor, G; Booth, Cn; Boswell, R; Brew, Caj; Cartwright, S; Combley, F; Kelly, Ms; Lehto, M; Newton, Wm; Reeve, J; Thompson, Lf; Affholderbach, K; Bohrer, A; Brandt, S; Cowan, G; Foss, J; Grupen, C; Lutters, G; Saraiva, P; Smolik, L; Stephan, F; Apollonio, M; Bosisio, L; Della Marina, R; Giannini, G; Gobbo, B; Musolino, G; Putz, J; Rothberg, J; Wasserbaech, S; Williams, Rw; Armstrong, Sr; Charles, E; Elmer, P; Ferguson, Dps; Gonzalez, S; Greening, Tc; Hayes, Oj; H, Hu; Jin, S; Mcnamara, Pa; Nachtman, Jm; Nielsen, J; Orejudos, W; Pan, Yb; Saadi, Y; Scott, Ij; Walsh, J; Wu, Sl; Wu, X; Yamartino, Jm; Zobernig, G.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 413:3-4(1997), pp. 431-446. [10.1016/S0370-2693(97)01178-7]

Searches for scalar top and scalar bottom quarks at LEP2

CREANZA, Donato Maria;IASELLI, Giuseppe;MAGGI, Giorgio Pietro;
1997-01-01

Abstract

Searches for scalar top and bottom quarks have been performed with data collected by the ALEPH detector at LEP. The data sample consists of 21.7 pb(-1) taken at root s = 161, 170, and 172 GeV and 5.7 pb(-1) taken at root s = 130 and 136 GeV. No evidence for scalar top quarks or scalar bottom quarks was found in the channels (t) over tilde --> c chi, (t) over tilde --> bl<(nu)over tilde>, and (b) over tilde --> b chi. For the channel (t) over tilde --> c chi a limit of 67 GeV/c(2) has been set on the scalar top quark mass, independent of the mixing angle between the supersymmetric partners of the left and right-handed states of the top quark. This limit assumes a mass difference between the (t) over tilde and the chi of at least 10 GeV/c(2). For the channel (t) over tilde --> bl<(nu)over tilde> the mixing-angle independent scalar top limit is 70 GeV/c(2), assuming a mass difference between the (t) over tilde and the <(nu)over tilde> of at least 10 GeV/c(2). For the channel (b) over tilde --> b chi, a limit of 73 GeV/c(2) has been set on the mass of the supersymmetric partner of the left-handed state of the bottom quark. This limit is valid if the mass difference between the (b) over tilde and the chi is at least 10 GeV/c(2).
1997
Searches for scalar top and scalar bottom quarks at LEP2 / Barate, R; Buskulic, D; Decamp, D; Ghez, P; Goy, C; Lees, Jp; Lucotte, A; Minard, Mn; Nief, Jy; Pietrzyk, B; Casado, Mp; Chmeissani, M; Comas, P; Crespo, Jm; Delfino, M; Fernandez, E; Fernandez Bosman, M; Garrido, L; Juste, A; Martinez, M; Merino, G; Miquel, R; Mir, Lm; Padilla, C; Park, Ic; Pascual, A; Perlas, Ja; Riu, I; Sanchez, F; Teubert, F; Colaleo, A; Creanza, Donato Maria; de Palma, M; Gelao, G; Iaselli, Giuseppe; Maggi, Giorgio Pietro; Maggi, M; Marinelli, N; Nuzzo, S; Ranieri, A; Raso, G; Ruggieri, F; Selvaggi, G; Silvestris, L; Tempesta, P; Tricomi, A; Zito, G; Huang, X; Lin, J; Ouyang, Q; Wang, T; Xie, Y; Xu, R; Xue, S; Zhang, J; Zhang, L; Zhao, W; Abbaneo, D; Alemany, R; Bazarko, Ao; Becker, U; Bright Thomas, P; Cattaneo, M; Cerutti, F; Dissertori, G; Drevermann, H; Forty, Rw; Frank, M; Hagelberg, R; Hansen, Jb; Harvey, J; Janot, P; Jost, B; Kneringer, E; Knobloch, J; Lehraus, I; Mato, P; Minten, A; Moneta, L; Pacheco, A; Pusztaszeri, Jf; Ranjard, F; Rizzo, G; Rolandi, L; Rousseau, D; Schlatter, D; Schmitt, M; Schneider, O; Tejessy, W; Tomalin, Ir; Wachsmuth, H; Wagner, A; Ajaltouni, Z; Barres, A; Boyer, C; Falvard, A; Ferdi, C; Gay, P; Guicheney, C; Henrard, P; Jousset, J; Michel, B; Monteil, S; Montret, Jc; Pallin, D; Perret, P; Podlyski, F; Proriol, J; Rosnet, P; Rossignol, Jm; Fearnley, T; Hansen, Jd; Hansen, Jr; Hansen, Ph; Nilsson, Bs; Rensch, B; Waananen, A; Daskalakis, G; Kyriakis, A; Markou, C; Simopoulou, E; Vayaki, A; Blondel, A; Brient, Jc; Machefert, F; Rouge, A; Rumpf, M; Valassi, A; Videau, H; Focardi, E; Parrini, G; Zachariadou, K; Cavanaugh, R; Corden, M; Georgiopoulos, C; Huehn, T; Jaffe, De; Antonelli, A; Bencivenni, G; Bologna, G; Bossi, F; Campana, P; Capon, G; Casper, D; Chiarella, V; Felici, G; Laurelli, P; Mannocchi, G; Murtas, F; Murtas, Gp; Passalacqua, L; Pepe Altarelli, M; Curtis, L; Dorris, Sj; Halley, Aw; Knowles, Ig; Lynch, Jg; O'Shea, V; Raine, C; Scarr, Jm; Smith, K; Teixeira Dias, P; Thompson, As; Thomson, E; Thomson, F; Turnbull, Rm; Buchmuller, O; Dhamotharan, S; Geweniger, C; Graefe, G; Hanke, P; Hansper, G; Hepp, V; Kluge, Ee; Putzer, A; Sommer, J; Tittel, K; Werner, S; Wunsch, M; Beuselinck, R; Binnie, Dm; Cameron, W; Dornan, Pj; Giorne, M; Goodsir, S; Martin, Eb; Morawitz, P; Moutoussi, A; Nash, J; Sedgbeer, Jk; Spagnolo, P; Stacey, Am; Williams, Md; Ghete, Vm; Girtler, P; Kuhn, D; Rudolph, G; Betteridge, Ap; Bowdery, Ck; Colrain, P; Crawford, G; Finch, Aj; Foster, F; Hughes, G; Jones, Rwl; Sloan, T; Whelan, Ep; Williams, Mi; Hoffmann, C; Jakobs, K; Kleinknecht, K; Quast, G; Renk, B; Rohne, E; Sander, Hg; van Gemmeren, P; Zeitnitz, C; Aubert, Jj; Benchouk, C; Bonissent, A; Bujosa, G; Carr, J; Coyle, P; Diaconu, C; Ealet, A; Fouchez, D; Konstantinidis, N; Leroy, O; Motsch, F; Payre, P; Talby, M; Sadouki, A; Thulasidas, M; Tilquin, A; Trabelsi, K; Aleppo, M; Antonelli, M; Ragusa, F; Berlich, R; Blum, W; Buscher, V; Dietl, H; Ganis, G; Gotzhein, C; Kroha, H; Lutjens, G; Lutz, G; Manner, W; Moser, Hg; Richter, R; Rosado Schlosser, A; Schael, S; Settles, R; Seywerd, H; St Denis, R; Stenzel, H; Wiedenmann, W; Wolf, G; Boucrot, J; Callot, O; Chen, S; Cordier, A; Davier, M; Duflot, L; Grivaz, Jf; Heusse, P; Hocker, A; Jacholkowska, A; Jacquet, M; Kim, Dw; Le Diberder, F; Lefrancois, J; Lutz, Am; Nikolic, I; Schune, Mh; Serin, L; Simion, S; Tournefier, E; Veillet, Jj; Videau, I; Zerwas, D; Azzurri, P; Bagliesi, G; Bettarini, S; Bozzi, C; Calderini, G; Ciulli, V; Dell'Orso, R; Fantechi, R; Ferrante, I; Giassi, A; Gregorio, A; Ligabue, F; Lusiani, A; Marrocchesi, Ps; Messineo, A; Palla, F; Sanguinetti, G; Sciaba, A; Sguazzoni, G; Steinberger, J; Tenchini, R; Vannini, C; Venturi, A; Verdini, Pg; Blair, Ga; Bryant, Lm; Chambers, Jt; Gao, Y; Green, Mg; Medcalf, T; Perrodo, P; Strong, Ja; von Wimmersperg Toeller, Jh; Botterill, Dr; Clifft, Rw; Edgecock, Tr; Haywood, S; Maley, P; Norton, Pr; Thompson, Jc; Wright, Ae; Bloch Devaux, B; Colas, P; Fabbro, B; Kozanecki, W; Lancon, E; Lemaire, Mc; Locci, E; Perez, P; Rander, J; Renardy, Jf; Rosowsky, A; Roussarie, A; Schuller, Jp; Schwindling, J; Trabelsi, A; Vallage, B; Black, Sn; Dann, Jh; Kim, Hy; Litke, Am; Mcneil, Ma; Taylor, G; Booth, Cn; Boswell, R; Brew, Caj; Cartwright, S; Combley, F; Kelly, Ms; Lehto, M; Newton, Wm; Reeve, J; Thompson, Lf; Affholderbach, K; Bohrer, A; Brandt, S; Cowan, G; Foss, J; Grupen, C; Lutters, G; Saraiva, P; Smolik, L; Stephan, F; Apollonio, M; Bosisio, L; Della Marina, R; Giannini, G; Gobbo, B; Musolino, G; Putz, J; Rothberg, J; Wasserbaech, S; Williams, Rw; Armstrong, Sr; Charles, E; Elmer, P; Ferguson, Dps; Gonzalez, S; Greening, Tc; Hayes, Oj; H, Hu; Jin, S; Mcnamara, Pa; Nachtman, Jm; Nielsen, J; Orejudos, W; Pan, Yb; Saadi, Y; Scott, Ij; Walsh, J; Wu, Sl; Wu, X; Yamartino, Jm; Zobernig, G.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 413:3-4(1997), pp. 431-446. [10.1016/S0370-2693(97)01178-7]
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