Single top production via flavour changing neutral currents in the reactions e(+)e(-) --> (t) over barc/u is searched for in approximately 411 pb(-1) of data collected by ALEPH at centre-of-mass energies in the range between 189 and 202 GeV. In total, 58 events are selected in the data to be compared with 50.3 expected from Standard Model backgrounds. No deviation from the Standard Model expectation is observed. Upper limits at 95% CL on single top production cross sections at roots = 189-202 GeV are derived. A model-dependent limit on the sum of branching ratios BR(t --> Zc) + BR(t --> Zu) < 17% is obtained. (C) 2000 Elsevier Science B.V. All rights reserved.
Search for single top production in e(+)e(-) collisions at root s=189-202 GeV / Barate, R; Decamp, D; Ghez, P; Goy, C; Jezequel, S; Lees, Jp; Martin, F; Merle, E; Minard, Mn; Pietrzyk, B; Przysiezniak, H; Alemany, R; Casado, Mp; Chmeissani, M; Crespo, Jm; Fernandez, E; Fernandez Bosman, M; Garrido, L; Grauges, E; Juste, A; Martinez, M; Merino, G; Miquel, R; Mir, Lm; Morawitz, P; Pacheco, A; Park, Ic; Riu, I; Colaleo, A; Creanza, Donato Maria; de Palma, M; Iaselli, Giuseppe; Maggi, Giorgio Pietro; Maggi, M; 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; Becker, U; Boix, G; Cattaneo, M; Cerutti, F; Ciulli, V; Dissertori, G; Drevermann, H; Forty, Rw; Frank, M; Gianotti, F; Greening, Tc; Halley, Aw; Hansen, Jb; Harvey, J; Janot, P; Jost, B; Lehraus, I; Leroy, O; Loomis, C; Maley, P; Mato, P; Minten, A; Moutoussi, A; Ranjard, F; Rolandi, L; Schlatter, D; Schmitt, M; Schneider, O; Spagnolo, P; Tejessy, W; Teubert, F; Tomalin, Ir; Tournefier, E; Wright, Ae; Ajaltouni, Z; Badaud, F; Chazelle, G; Deschamps, O; Dessagne, S; Falvard, A; Ferdi, C; Gay, P; Guicheney, C; Henrard, P; Jousset, J; Michel, B; Monteil, S; Montret, Jc; Pallin, D; Perret, P; Podlyski, F; 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; Swynghedauw, M; Tanaka, R; Valassi, A; Videau, H; Focardi, E; Parrini, G; Zachariadou, K; Cavanaugh, R; Corden, M; Georgiopoulos, C; Antonelli, A; Bencivenni, G; Bologna, G; Bossi, F; Campana, P; Capon, G; Chiareela, V; Laurelli, P; Mannocchi, G; Murtas, F; Murtas, Gp; Passalacqua, L; Pepe Altarelli, M; Chalmers, M; Curtis, L; Lynch, Jg; Negus, P; O'Shea, V; Raeven, B; Raine, C; Smith, D; Teixeira Dias, P; Thompson, As; Ward, Jj; Buchmuller, O; Dhamotharan, S; Geweniger, C; 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; Girone, M; Goodsir, S; Marinelli, N; Martin, Eb; Nash, J; Nowell, J; Sciaba, A; Sedgbeer, Jk; Thomson, E; Williams, Md; Ghete, Vm; Girtler, P; Kneringer, E; Kuhn, D; Rudolph, G; Bowdery, Ck; Buck, Pg; Ellis, G; Finch, Aj; Foster, F; Hughes, G; Jones, Rwl; Robertson, Na; Smizanska, M; Williams, Mi; Giehl, I; Holldorfer, F; Jakobs, K; Kleinknecht, K; Krocker, M; Muller, As; Nurnberger, Ha; Quast, G; Renk, B; Rohne, E; Sander, Hg; Schmeling, S; Wachsmuth, H; Zeitnitz, C; Ziegler, T; Aubert, Jj; Benchouk, C; Bonissent, A; Carr, J; Coyle, P; Ealet, A; Fouchez, D; Motsch, F; Payre, P; Rousseau, D; Talby, M; Thulasidas, M; Tilquin, A; Aleppo, M; Antonelli, M; Ragusa, F; Buscher, V; Dietl, H; Ganis, G; Huttmann, K; Lutjens, G; Manert, C; Manner, W; Moser, Hg; Schael, S; Settles, R; Seywerd, H; Stenzel, H; Wiedenmann, W; Wolf, G; Azzurri, P; Boucrot, J; Callot, O; Chen, S; Davier, M; Duflot, L; Grivaz, Jf; Heusse, P; Jacholkowska, A; Kado, M; Lefrancois, J; Serin, L; Veillet, Jj; Videau, I; de Regie, Jbd; Zerwas, D; Bagliesi, G; Bettarini, S; Boccali, T; Bozzi, C; Calderini, G; Dell'Orso, R; Ferrante, I; Giassi, A; Gregorio, A; Ligabue, F; Lusiani, A; Marrocchesi, Ps; Messineo, A; Palla, F; Rizzo, G; Sanguinetti, G; Sguazzoni, G; Tenchini, R; Vannini, C; Venturi, A; Verdini, Pg; Blair, Ga; Coles, J; Cowan, G; Green, Mg; Hutchcroft, De; Jones, Lt; Medcalf, T; Strong, Ja; von Wimmersperg Toeller, Jh; Botterill, Dr; Clifft, Rw; Edgecock, Tr; Norton, Pr; Thompson, Jc; Bloch Devaux, B; Colas, P; Fabbro, B; Faif, G; Lancon, E; Lemaire, Mc; Locci, E; Perez, P; Rander, J; Renardy, Jf; Rosowsky, A; Trabelsi, A; Tuchming, B; Vallage, B; Black, Sn; Dann, Jh; Kim, Hy; Konstantinidis, N; Litke, Am; Mcneil, Ma; Taylor, G; Booth, Cn; Cartwright, S; Combley, F; Hodgson, Pn; Kelly, Ms; Lehto, M; Thompson, Lf; Affholderbach, K; Bohrer, A; Brandt, S; Grupen, C; Hess, J; Misiejuk, A; Prange, G; Sieler, U; Giannini, G; Gobbo, B; Putz, J; Rothberg, J; Wasserbaech, S; Williams, Rw; Armstrong, Sr; Elmer, P; Ferguson, Dps; Gao, Y; Gonzalez, S; Hayes, Oj; H, Hu; Jin, S; Mcnamara, Pa; Nielsen, J; Orejudos, W; Pan, Yb; Saadi, Y; Scott, Ij; Walsh, J; Wu, Sl; Wu, X; Zobernig, G.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 494:1-2(2000), pp. 33-45. [10.1016/S0370-2693(00)01189-8]
Search for single top production in e(+)e(-) collisions at root s=189-202 GeV
Barate R; Decamp D; Ghez P; Goy C; Jezequel S; Lees JP; Martin F; Merle E; Minard MN; Pietrzyk B; Przysiezniak H; Alemany R; Casado MP; Chmeissani M; Crespo JM; Fernandez E; Fernandez Bosman M; Garrido L; Grauges E; Juste A; Martinez M; Merino G; Miquel R; Mir LM; Morawitz P; Pacheco A; Park IC; Riu I; Colaleo A; CREANZA, Donato Maria ;de Palma M; IASELLI, Giuseppe ;MAGGI, Giorgio Pietro ;Maggi M; 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; Becker U; Boix G; Cattaneo M; Cerutti F; Ciulli V; Dissertori G; Drevermann H; Forty RW; Frank M; Gianotti F; Greening TC; Halley AW; Hansen JB; Harvey J; Janot P; Jost B; Lehraus I; Leroy O; Loomis C; Maley P; Mato P; Minten A; Moutoussi A; Ranjard F; Rolandi L; Schlatter D; Schmitt M; Schneider O; Spagnolo P; Tejessy W; Teubert F; Tomalin IR; Tournefier E; Wright AE; Ajaltouni Z; Badaud F; Chazelle G; Deschamps O; Dessagne S; Falvard A; Ferdi C; Gay P; Guicheney C; Henrard P; Jousset J; Michel B; Monteil S; Montret JC; Pallin D; Perret P; Podlyski F; 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; Swynghedauw M; Tanaka R; Valassi A; Videau H; Focardi E; Parrini G; Zachariadou K; Cavanaugh R; Corden M; Georgiopoulos C; Antonelli A; Bencivenni G; Bologna G; Bossi F; Campana P; Capon G; Chiareela V; Laurelli P; Mannocchi G; Murtas F; Murtas GP; Passalacqua L; Pepe Altarelli M; Chalmers M; Curtis L; Lynch JG; Negus P; O'Shea V; Raeven B; Raine C; Smith D; Teixeira Dias P; Thompson AS; Ward JJ; Buchmuller O; Dhamotharan S; Geweniger C; 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; Girone M; Goodsir S; Marinelli N; Martin EB; Nash J; Nowell J; Sciaba A; Sedgbeer JK; Thomson E; Williams MD; Ghete VM; Girtler P; Kneringer E; Kuhn D; Rudolph G; Bowdery CK; Buck PG; Ellis G; Finch AJ; Foster F; Hughes G; Jones RWL; Robertson NA; Smizanska M; Williams MI; Giehl I; Holldorfer F; Jakobs K; Kleinknecht K; Krocker M; Muller AS; Nurnberger HA; Quast G; Renk B; Rohne E; Sander HG; Schmeling S; Wachsmuth H; Zeitnitz C; Ziegler T; Aubert JJ; Benchouk C; Bonissent A; Carr J; Coyle P; Ealet A; Fouchez D; Motsch F; Payre P; Rousseau D; Talby M; Thulasidas M; Tilquin A; Aleppo M; Antonelli M; Ragusa F; Buscher V; Dietl H; Ganis G; Huttmann K; Lutjens G; Manert C; Manner W; Moser HG; Schael S; Settles R; Seywerd H; Stenzel H; Wiedenmann W; Wolf G; Azzurri P; Boucrot J; Callot O; Chen S; Davier M; Duflot L; Grivaz JF; Heusse P; Jacholkowska A; Kado M; Lefrancois J; Serin L; Veillet JJ; Videau I; de Regie JBD; Zerwas D; Bagliesi G; Bettarini S; Boccali T; Bozzi C; Calderini G; Dell'Orso R; Ferrante I; Giassi A; Gregorio A; Ligabue F; Lusiani A; Marrocchesi PS; Messineo A; Palla F; Rizzo G; Sanguinetti G; Sguazzoni G; Tenchini R; Vannini C; Venturi A; Verdini PG; Blair GA; Coles J; Cowan G; Green MG; Hutchcroft DE; Jones LT; Medcalf T; Strong JA; von Wimmersperg Toeller JH; Botterill DR; Clifft RW; Edgecock TR; Norton PR; Thompson JC; Bloch Devaux B; Colas P; Fabbro B; Faif G; Lancon E; Lemaire MC; Locci E; Perez P; Rander J; Renardy JF; Rosowsky A; Trabelsi A; Tuchming B; Vallage B; Black SN; Dann JH; Kim HY; Konstantinidis N; Litke AM; McNeil MA; Taylor G; Booth CN; Cartwright S; Combley F; Hodgson PN; Kelly MS; Lehto M; Thompson LF; Affholderbach K; Bohrer A; Brandt S; Grupen C; Hess J; Misiejuk A; Prange G; Sieler U; Giannini G; Gobbo B; Putz J; Rothberg J; Wasserbaech S; Williams RW; Armstrong SR; Elmer P; Ferguson DPS; Gao Y; Gonzalez S; Hayes OJ; Hu H; Jin S; McNamara PA; Nielsen J; Orejudos W; Pan YB; Saadi Y; Scott IJ; Walsh J; Wu SL; Wu X; Zobernig G.
2000-01-01
Abstract
Single top production via flavour changing neutral currents in the reactions e(+)e(-) --> (t) over barc/u is searched for in approximately 411 pb(-1) of data collected by ALEPH at centre-of-mass energies in the range between 189 and 202 GeV. In total, 58 events are selected in the data to be compared with 50.3 expected from Standard Model backgrounds. No deviation from the Standard Model expectation is observed. Upper limits at 95% CL on single top production cross sections at roots = 189-202 GeV are derived. A model-dependent limit on the sum of branching ratios BR(t --> Zc) + BR(t --> Zu) < 17% is obtained. (C) 2000 Elsevier Science B.V. All rights reserved.
Citazione
Search for single top production in e(+)e(-) collisions at root s=189-202 GeV / Barate, R; Decamp, D; Ghez, P; Goy, C; Jezequel, S; Lees, Jp; Martin, F; Merle, E; Minard, Mn; Pietrzyk, B; Przysiezniak, H; Alemany, R; Casado, Mp; Chmeissani, M; Crespo, Jm; Fernandez, E; Fernandez Bosman, M; Garrido, L; Grauges, E; Juste, A; Martinez, M; Merino, G; Miquel, R; Mir, Lm; Morawitz, P; Pacheco, A; Park, Ic; Riu, I; Colaleo, A; Creanza, Donato Maria; de Palma, M; Iaselli, Giuseppe; Maggi, Giorgio Pietro; Maggi, M; 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; Becker, U; Boix, G; Cattaneo, M; Cerutti, F; Ciulli, V; Dissertori, G; Drevermann, H; Forty, Rw; Frank, M; Gianotti, F; Greening, Tc; Halley, Aw; Hansen, Jb; Harvey, J; Janot, P; Jost, B; Lehraus, I; Leroy, O; Loomis, C; Maley, P; Mato, P; Minten, A; Moutoussi, A; Ranjard, F; Rolandi, L; Schlatter, D; Schmitt, M; Schneider, O; Spagnolo, P; Tejessy, W; Teubert, F; Tomalin, Ir; Tournefier, E; Wright, Ae; Ajaltouni, Z; Badaud, F; Chazelle, G; Deschamps, O; Dessagne, S; Falvard, A; Ferdi, C; Gay, P; Guicheney, C; Henrard, P; Jousset, J; Michel, B; Monteil, S; Montret, Jc; Pallin, D; Perret, P; Podlyski, F; 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; Swynghedauw, M; Tanaka, R; Valassi, A; Videau, H; Focardi, E; Parrini, G; Zachariadou, K; Cavanaugh, R; Corden, M; Georgiopoulos, C; Antonelli, A; Bencivenni, G; Bologna, G; Bossi, F; Campana, P; Capon, G; Chiareela, V; Laurelli, P; Mannocchi, G; Murtas, F; Murtas, Gp; Passalacqua, L; Pepe Altarelli, M; Chalmers, M; Curtis, L; Lynch, Jg; Negus, P; O'Shea, V; Raeven, B; Raine, C; Smith, D; Teixeira Dias, P; Thompson, As; Ward, Jj; Buchmuller, O; Dhamotharan, S; Geweniger, C; 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; Girone, M; Goodsir, S; Marinelli, N; Martin, Eb; Nash, J; Nowell, J; Sciaba, A; Sedgbeer, Jk; Thomson, E; Williams, Md; Ghete, Vm; Girtler, P; Kneringer, E; Kuhn, D; Rudolph, G; Bowdery, Ck; Buck, Pg; Ellis, G; Finch, Aj; Foster, F; Hughes, G; Jones, Rwl; Robertson, Na; Smizanska, M; Williams, Mi; Giehl, I; Holldorfer, F; Jakobs, K; Kleinknecht, K; Krocker, M; Muller, As; Nurnberger, Ha; Quast, G; Renk, B; Rohne, E; Sander, Hg; Schmeling, S; Wachsmuth, H; Zeitnitz, C; Ziegler, T; Aubert, Jj; Benchouk, C; Bonissent, A; Carr, J; Coyle, P; Ealet, A; Fouchez, D; Motsch, F; Payre, P; Rousseau, D; Talby, M; Thulasidas, M; Tilquin, A; Aleppo, M; Antonelli, M; Ragusa, F; Buscher, V; Dietl, H; Ganis, G; Huttmann, K; Lutjens, G; Manert, C; Manner, W; Moser, Hg; Schael, S; Settles, R; Seywerd, H; Stenzel, H; Wiedenmann, W; Wolf, G; Azzurri, P; Boucrot, J; Callot, O; Chen, S; Davier, M; Duflot, L; Grivaz, Jf; Heusse, P; Jacholkowska, A; Kado, M; Lefrancois, J; Serin, L; Veillet, Jj; Videau, I; de Regie, Jbd; Zerwas, D; Bagliesi, G; Bettarini, S; Boccali, T; Bozzi, C; Calderini, G; Dell'Orso, R; Ferrante, I; Giassi, A; Gregorio, A; Ligabue, F; Lusiani, A; Marrocchesi, Ps; Messineo, A; Palla, F; Rizzo, G; Sanguinetti, G; Sguazzoni, G; Tenchini, R; Vannini, C; Venturi, A; Verdini, Pg; Blair, Ga; Coles, J; Cowan, G; Green, Mg; Hutchcroft, De; Jones, Lt; Medcalf, T; Strong, Ja; von Wimmersperg Toeller, Jh; Botterill, Dr; Clifft, Rw; Edgecock, Tr; Norton, Pr; Thompson, Jc; Bloch Devaux, B; Colas, P; Fabbro, B; Faif, G; Lancon, E; Lemaire, Mc; Locci, E; Perez, P; Rander, J; Renardy, Jf; Rosowsky, A; Trabelsi, A; Tuchming, B; Vallage, B; Black, Sn; Dann, Jh; Kim, Hy; Konstantinidis, N; Litke, Am; Mcneil, Ma; Taylor, G; Booth, Cn; Cartwright, S; Combley, F; Hodgson, Pn; Kelly, Ms; Lehto, M; Thompson, Lf; Affholderbach, K; Bohrer, A; Brandt, S; Grupen, C; Hess, J; Misiejuk, A; Prange, G; Sieler, U; Giannini, G; Gobbo, B; Putz, J; Rothberg, J; Wasserbaech, S; Williams, Rw; Armstrong, Sr; Elmer, P; Ferguson, Dps; Gao, Y; Gonzalez, S; Hayes, Oj; H, Hu; Jin, S; Mcnamara, Pa; Nielsen, J; Orejudos, W; Pan, Yb; Saadi, Y; Scott, Ij; Walsh, J; Wu, Sl; Wu, X; Zobernig, G.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 494:1-2(2000), pp. 33-45. [10.1016/S0370-2693(00)01189-8]
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