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EnglishA search for charginos nearly mass degenerate with the lightest neutralino is performed with the data collected by the ALEPH detector at LEP, at centre-of-mass energies between 189 and 209 GeV, corresponding to an integrated luminosity of 628 pb(-1). The analysis is based on the detection of isolated and energetic initial state radiation photons, produced in association with chargino pairs whose decay products have little visible energy. The number of candidate events observed is in agreement with that expected from Standard Model background sources. These results are combined with those of other direct searches for charginos, and a lower limit of 88 GeV/c(2) at 95% confidence level is derived for the chargino mass in the case of heavy sfermions, irrespective of the chargino-neutralino mass difference. (C) 2002 Elsevier Science B.V. All rights reserved.
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| Autori: | Heister A; Schael S; Barate R; Bruneliere R; De Bonis I; Decamp D; Goy C; Jezequel S; Lees JP; Martin F; Merle E; Minard MN; Pietrzyk B; Trocme B; Boix G; Bravo S; Casado MP; Chmeissani M; Crespo JM; Fernandez E; Fernandez-Bosman M; Garrido L; Grauges E; Lopez J; Martinez M; Merino G; Miquel R; Mir LM; Pacheco A; Paneque D; Ruiz H; Colaleo A; Creanza D; De Filippis N; de Palma M; Iaselli G; Maggi G; 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; Azzurri P; Barklow T; Buchmuller O; Cattaneo A; Cerutti F; Clerbaux B; Drevermann H; Forty RW; Frank M; Gianotti F; Greening TC; Hansen JB; Harvey J; Hutchcroft DE; Janot P; Jost B; Kado M; Mato P; Moutoussi A; Ranjard F; Rolandi L; Schlatter D; Sguazzoni G; Tejessy W; Teubert F; Valassi A; Videau I; Ward JJ; Badaud F; Dessagne S; Falvard A; Fayolle D; Gay P; Jousset J; Michel B; Monteil S; Pallin D; Pascolo JM; Perret P; Hansen JD; Hansen JR; Hansen PH; Nilsson BS; Kyriakis A; Markou C; Simopoulou E; Vayaki A; Zachariadou K; Blondel A; Brient JC; Machefert F; Rouge A; Swynghedauw M; Tanaka R; Videau H; Ciulli V; Focardi E; Parrini G; Antonelli A; Antonelli M; Bencivenni G; Bossi F; Campana P; Capon G; Chiarella V; Laurelli P; Mannocchi G; Murtas F; Murtas GP; Passalacqua L; Halley A; Kennedy J; Lynch JG; Negus P; O'Shea V; Thompson AS; Wasserbaech S; Cavanaugh R; Dhamotharan S; Geweniger C; Hanke P; Hepp V; Kluge EE; Leibenguth G; Putzer A; Stenzel H; Tittel K; Wunsch M; Beuselinck R; Cameron W; Davies G; Dornan PJ; Girone M; Hill RD; Marinelli N; Nowell J; Rutherford SA; Sedgbeer JK; Thompson JC; White R; Ghete VM; Girtler P; Kneringer E; Kuhn D; Rudolph G; Bouhova-Thacker E; Bowdery CK; Clarke DP; Ellis G; Finch AJ; Foster F; Hughes G; Jones RWL; Pearson MR; Robertson NA; Smizanska M; van der Aa O; Delaere C; Lemaitre V; Blumenschein U; Holldorfer F; Jakobs K; Kayser F; Kleinknecht K; Muller AS; Quast G; Renk B; Sander HG; Schmeling S; Wachsmuth H; Zeitnitz C; Ziegler T; Bonissent A; Coyle P; Curtil C; Ealet A; Fouchez D; Payre P; Tilquin A; Ragusa F; David A; Dietl H; Ganis G; Huttmann K; Lutjens G; Manner W; Moser HG; Settles R; Wolf G; Boucrot J; Callot O; Davier M; Duflot L; Grivaz JF; Heusse P; Jacholkowska A; Loomis C; Serin L; Veillet JJ; de Regie JBD; Yuan C; Bagliesi G; Boccali T; Foa L; Giammanco A; Giassi A; Ligabue F; Messineo A; Palla F; Sanguinetti G; Sciaba A; Tenchini R; Venturi A; Verdini PG; Awunor O; Blair GA; Cowan G; Garcia-Bellido A; Green MG; Jones LT; Medcalf T; Misiejuk A; Strong JA; Teixeira-Dias P; Clifft RW; Edgecock TR; Norton PR; Tomalin IR; Bloch-Devaux B; Boumediene D; Colas P; Fabbro B; Lancon E; Lemaire MC; Locci E; Perez P; Rander J; Renardy JF; Rosowsky A; Seager P; Trabelsi A; Tuchming B; Vallage B; Konstantinidis N; Litke AM; Taylor G; Booth CN; Cartwright S; Combley F; Hodgson PN; Lehto M; Thompson LF; Affholderbach K; Bohrer A; Brandt S; Grupen C; Hess J; Ngac A; Prange G; Sieler U; Borean C; Giannini G; He H; Putz J; Rothberg J; Armstrong SR; Berkelman K; Cranmer K; Ferguson DPS; Gao Y; Gonzalez S; Hayes OJ; Hu H; Jin S; Kile J; McNamara PA; Nielsen J; Pan YB; von Wimmersperg-Toeller JH; Wiedenmann W; Wu J; Wu SL; Wu X; Zobernig G; Dissertori G |
| Titolo: | Search for charginos nearly mass degenerate with the lightest neutralino in e(+)e(-) collisions at centre-of-mass energies up to 209 GeV |
| Anno del prodotto: | 2002 |
| Abstract: | A search for charginos nearly mass degenerate with the lightest neutralino is performed with the data collected by the ALEPH detector at LEP, at centre-of-mass energies between 189 and 209 GeV, corresponding to an integrated luminosity of 628 pb(-1). The analysis is based on the detection of isolated and energetic initial state radiation photons, produced in association with chargino pairs whose decay products have little visible energy. The number of candidate events observed is in agreement with that expected from Standard Model background sources. These results are combined with those of other direct searches for charginos, and a lower limit of 88 GeV/c(2) at 95% confidence level is derived for the chargino mass in the case of heavy sfermions, irrespective of the chargino-neutralino mass difference. (C) 2002 Elsevier Science B.V. All rights reserved. |
| Digital Object Identifier (DOI): | 10.1016/S0370-2693(02)01584-8 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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