Search for supersymmetric particles in e+e− collisions at ? up to 202 GeV and mass limit for the lightest neutralino

R. Barate,I. De Bonis,D. Décamp,Ph Ghez,Corinne B. Goy,Stephane Jézéquel,Jean Pierre Lees,Françoise F. Martin,E. Merle,Marie Noelle Minard,Bolek Pietrzyk,S. Bravo,M. P. Casado,Mokhtar A. Chmeissani,José M. Crespo,Enrique Fernández,M. Fernandez-Bosman,Ll C. Garrido,Eugeni S. Graugés,J. Lopez,Mauricio C. Martínez,G. Merino,Ramon Miquel,Ll M. Mir,Alberto J. Pacheco,David Paneque,Hugo S. Ruiz,Anna Colaleo,Donato Creanza,Nicola De Filippis,Mauro De Palma,Giuseppe Iaselli,Giorgio Pietro Maggi,Marcello Maggi,Salvatore Nuzzo,Antonio Ranieri,Giuseppe Raso,Federico Ruggierí,G. Selvaggi,Lucia Silvestris,Piergiulio Tempesta,Alessia Tricomi,Giuseppe Zito,Xiuping Huáng,Jim Lin,Qun Ouyang,Taijie Wang,Yi Xie,Rui Xu,Shengtian Xue,Jian Zhang,Lei Zhang,Wei Zhao,Duccio Abbaneo,Paolo Azzürri,Timothy L. Barklow,Gaëlle Boix,O. L. Büchmüller,Marco Cattaneo,Francesco Cerutti,Barbara Clerbaux,Günther Dissertori,Hans Drevermann,Roger W. Forty,Markus J. Frank,Fabiola Gianotti,T. C. Greening,Jørgen Beck Hansen,Jeffrey A. Harvey,David E. Hutchcroft,Patrick Janot,Beat Jost,Marumi Kado,Vincent Lemaître,P. D. Maley,Pere Mató,A. Minten,A. Moutoussi,Florence Ranjard,Luigi Rolandi,Dieter Schlatter,Michael Schmitt,Olivier Schneider,Paolo Spagnolo,W. Tejessy,Frederic Teubert,Edwige Tournefier,Andrea Valassi,Jonathan J. Ward,Alison E. Wright,Zeina J. Ajaltouni,Frédérique Badaud,S. Dessagne,A. Falvard,D. Fayolle,Pascal Gay,Pierre Henrard,J. C. Jousset,B. Michel,Stéphane Monteil,J. C. Montret,Dominique Pallin,J. M. Pascólo,Pascal Perret,F. Podlyski,Jakob Dines Hansen,John Renner Hansen,Philip H. Hansen,Björn S. Nilsson,Anders Wäänänen,Georgios Daskalakis,A. Kyriakis,Christos T. Markou,E. Simopoulou,A. Vayaki,Alain P. Blondel,Jean Claude Brient,Frédéric MacHefert,André Rougé,M. Swynghedauw,Reisaburo Tanaka,Henri Videau,Ettore Focardi,Giuliano Parrini,K. Zachariadou,Angelo Antonelli,Mario Antonelli,Giorgio Bencivenni,G. F. Bologna,Fabio C. Bossi,Pierluigi L. Campana,G. Capon,Vitaliano Chiarella,P. Laurelli,G. P. Mannocchi,Fabrizio Murtas,G. P. Murtas,L. Passalacqua,M. Pepe Altarelli,M. Chalmers,A. W. Halley,John F. Kennedy,James G R Lynch,Peter J. Negus,Val O'Shea,B. Raeven,D. J. Smith,P. Teixeira-Dias,A. Stan Thompson,Richard Cavanaugh,S. Dhamotharan,Chr C. Geweniger,Paul A. Hanke,Volker Hepp,E. E. Kluge,G. Leibenguth,Alois Putzer,K. Tittel,Sebastian Werner,Martin Wunsch,R. Beuselinck,David M. Binnie,W. Cameron,Gavin J. Davies,PJ J. Dornan,Maria Girone,Nancy Marinelli,Jeremy Nowell,Helenka Przysiȩzniak,J. K. Sedgbeer,James C. Thompson,Evelyn J. Thomson,Rachel F. White,V. M. Ghete,P. Girtler,Emmerich Kneringer,D. Kuhn,Gerald Rudolph,Eva V. Bouhova- Thacker,Chris K. Bowdery,D. P. Clarke,Geoffrey F R Ellis,AJ J. Finch,F. Foster,G. D. Hughes,Roger W L Jones,M. R. Pearson,N. A. Robertson,Maria Smižanská,I. Giehl,F. Hölldorfer,Karl Heinz Jakobs,Konrad Kleinknècht,M. Kröcker,Anke Susanne Müller,H. A. Nürnberger,Günter Quast,Burkhard Renk,Eric Rohne,Heinz Georg Sander,S. Schmeling,H. W. Wachsmuth,Ch Zeitnitz,Th Ziegler,Alain Bonissent,John Austin Carr,Paschal A. Coyle,Christian Curtil,Anne Ealet,Dominique Fouchez,Olivier Leroy,Th Kachelhoffer,Patrice Payre,David Rousseau,André Tìlquin,Mario Aleppo,Simone S. Gilardoni,Francesco Ragusa,A. David,Hans Dietl,Gerardo Ganis,A. Heister,Kay Hüttmann,G. Lütjens,C. Mannert,W. E. Männer,Hans Günther Moser,Stefan Schael,Ronald Dean Settles,Hasko Stenzel,Günter K. Wolf,J. Boucrot,Olivier H. Callot,Michel Davier,L. Duflot,Jean François Grivaz,Ph Heusse,Agnieszka Jachołkowska,L. Serin,J. J. Veillet,Ioana Videau,J. B. De Vivie De Régie,Chao Yuan,Dirk Zerwas,Giuseppe Bagliesi,Tommaso Boccali,Giovanni Calderini,V. Ciülli,Lorenzo Foà,Andrea Giammanco,A. Giassi,F. Ligabue,Alberto Messineo,Fabrizio Palla,Giulio Sanguinetti,Andrea Sciabà,Giacomo Sgüazzoni,Roberto Tenchini,Andrea Venturi,Piero Giorgio Verdini,Grahame A. Blair,J. Coles,Glen A. Cowan,Martin G. Green,Lee T. Jones,T. Medcalf,John A. Strong,R. W. Clifft,T. R. Edgecock,PR R. Norton,I. R. Tomalin,Brigitte Bloch-Devaux,Djamel Eddine Boumediène,Paul Colas,B. Fabbro,Eric Lançon,M. C. Lemaire,E. Locci,Patrice Rodríguez Pérez,J. Rander,Jean F. Renardy,A. Rosowsky,P. Seager,Adel Trabelsi,Boris Tuchming,Bertrand Vallage,Nikos Konstantinidis,C. Loomis,Alan M. Litke,Gary N. Taylor,C. N. Booth,Susan L. Cartwright,F. H. Combley,P. N. Hodgson,Mark H. Lehto,Lee F. Thompson,K. Affholderbach,Armin Böhrer,Siegmund Brandt,Claus Grupen,James S. Heß,Andrzej Stanislaw Misiejuk,G. Prange,U. Sieler,C. Borean,Gianrossano R. Giannini,Benigno Gobbo,Hongjian He,J. Putz,Joe E. Rothberg,Steven R. Wasserbaech,S. R. Armstrong,Kyle S. Cranmer,Peter Elmer,D. P S Ferguson,Yongsheng Gao,Sergio González,OJ J. Hayes,Hongbo Hu,Shi Jin,Jennifer E. Kile,PA A. McNamara,Jason Nielsen,W. Orejudos,Yi Pan,Y. Saadi,I. J. Scott,J. H. Von Wimmersperg-Toeller,John J. Walsh,Werner Wiedenmann,Joz Wu,Wu Sau Lan,Xin Wu,Georg Zobernig

Physics Letters B（2001）

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Abstract

Searches for pair production of squarks, sleptons, charginos and neutralinos are performed with the data collected by the ALEPH detector at LEP at centre-of-mass energies from 188.6 to 201.6 GeV. No evidence for any such signals is observed in a total integrated luminosity of about 410 pb−1. The negative results of the searches are translated into exclusion domains in the space of the relevant MSSM parameters, which improve significantly on the constraints set previously. Under the assumptions of gaugino and sfermion mass unification, these results allow a 95% C.L. lower limit of 37 GeV/c2 to be set on the mass of the lightest neutralino for any tanβ and sfermion mass. Additional constraints in the MSSM parameter space are derived from the negative results of ALEPH searches for Higgs bosons. The results are also interpreted in the framework of minimal supergravity.

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