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Search for supersymmetry in the photon(s) plus missing energy channels at $\sqrt{s}$=161 GeV and 172 GeV

R. Barate 1 D. Buskulic 1 D. Decamp 1 P. Ghez 1 C. Goy 1 J.P. Lees 1 A. Lucotte 1 M.N. Minard 1 J.Y. Nief 1 B. Pietrzyk 1 M.P. Casado M. Chmeissani P. Comas J.M. Crespo M. Delfino E. Fernandez L. Garrido A. Juste M. Martinez G. Merino R. Miquel L.M. Mir C. Padilla I.C. Park A. Pascual J.A. Perlas I. Riu F. Sanchez A. Colaleo D. Creanza M. de Palma G. Gelao G. Iaselli G. Maggi M. Maggi S. Nuzzo A. Ranieri G. Raso F. Ruggieri G. Selvaggi L. Silvestris A. Tricomi G. Zito X. Huang Jiali Lin Q. Ouyang T. Wang Y. Xie R. Xu S. Xue J. Zhang L. Zhang R. Alemany A.O. Bazarko U. Becker P. Bright-Thomas M. Cattaneo G. Dissertori H. Drevermann R.W. Forty M. Frank R. Hagelberg J.B. Hansen J. Harvey P. Janot B. Jost E. Kneringer I. Lehraus P. Mato A. Minten L. Moneta J.F. Pusztaszeri F. Ranjard G. Rizzo L. Rolandi D. Rousseau D. Schlatter O. Schneider W. Tejessy F. Teubert I.R. Tomalin H. Wachsmuth Ziad Ajaltouni 2 A. Barres 2 Claudine Boyer 2 Alain Falvard 2 C. Ferdi 2 Pascal Gay 2 C. Guicheney 2 Pierre Henrard 2 J. Jousset 2 B. Michel 2 S. Monteil 2 Jean-Claude Montret 2 D. Pallin Pascal Perret 2 F. Podlyski 2 Joseph Proriol 2 P. Rosnet 2 J.M. Rossignol 2 T. Fearnley J.D. Hansen J.R. Hansen P.H. Hansen B.S. Nilsson B. Rensch G. Daskalakis A. Kyriakis C. Markou E. Simopoulou A. Blondel 3 J.C. Brient 3 F. Machefert 3 A. Rouge 3 M. Rumpf 3 T. Boccali H. Videau E. Focardi G. Parrini R. Cavanaugh M. Corden C. Georgiopoulos T. Huehn D.E. Jaffe A. Antonelli G. Bencivenni G. Bologna F. Bossi G. Capon D. Casper V. Chiarella G. Felici P. Laurelli G. Mannocchi F. Murtas G.P. Murtas L. Passalacqua L. Curtis S.J. Dorris A.W. Halley I.G. Knowles J.G. Lynch V. O'Shea C. Raine K. Smith P. Teixeira-Dias A.S. Thompson E. Thomson F. Thomson O. Buchmuller S. Dhamotharan C. Geweniger G. Graefe P. Hanke G. Hansper E.E. Kluge A. Putzer J. Sommer K. Tittel S. Werner R. Beuselinck D.M. Binnie W. Cameron P.J. Dornan M. Girone S. Goodsir P. Morawitz A. Moutoussi J. Nash J.K. Sedgbeer P. Spagnolo A.M. Stacey M.D. Williams V.M. Ghete P. Girtler D. Kuhn G. Rudolph A.P. Betteridge C.K. Bowdery P.G. Buck P. Colrain G. Crawford A.J. Finch F. Foster G. Hughes R.W.L. Jones T. Sloan E.P. Whelan M.I. Williams I. Giehl C. Hoffmann K. Jakobs K. Kleinknecht G. Quast B. Renk E. Rohne P. van Gemmeren C. Zeitnitz J.J. Aubert 4 C. Benchouk 4 A. Bonissent 4 G. Bujosa 4 J. Carr 4 P. Coyle 4 C. Diaconu 4 A. Ealet 4 D. Fouchez 4 N. Konstantinidis 4 O. Leroy 4 F. Motsch 4 P. Payre 4 M. Talby 4 A. Sadouki 4 A. Tilquin 4 Karim Trabelsi 4 M. Aleppo M. Antonelli R. Berlich W. Blum V. Buscher H. Dietl G. Ganis C. Gotzhein H. Kroha G. Lutjens G. Lutz W. Manner H.G. Moser R. Richter A. Rosado-Schlosser S. Schael R. Settles H. Seywerd H. Stenzel W. Wiedenmann G. Wolf J. Boucrot 5 O. Callot 5 S. Chen 5 A. Cordier 5 M. Davier L. Duflot 5 J.F. Grivaz 5 Ph. Heusse 5 A. Hocker 5 A. Jacholkowska 5 M. Jacquet 5 D.W. Kim 5 F. Le Diberder 5 J. Lefrancois 5 I. Nikolic 5 M.H. Schune 5 L. Serin 5 S. Simion 5 E. Tournefier 5 J.J. Veillet 5 I. Videau 5 D. Zerwas 5 P. Azzurri G. Bagliesi S. Bettarini C. Bozzi G. Calderini V. Ciulli R. Dell'Orso R. Fantechi I. Ferrante A. Gregorio F. Ligabue A. Lusiani P.S. Marrocchesi A. Messineo F. Palla A. Sciaba G. Sguazzoni J. Steinberger R. Tenchini C. Vannini A. Venturi P.G. Verdini G.A. Blair L.M. Bryant J.T. Chambers Y. Gao M.G. Green T. Medcalf P. Perrodo J.A. Strong J.H. von Wimmersperg-Toeller D.R. Botterill R.W. Clifft T.R. Edgecock S. Haywood P. Maley P.R. Norton A.E. Wright B. Bloch-Devaux P. Colas B. Fabbro W. Kozanecki E. Lancon M.C. Lemaire P. Perez J. Rander J.F. Renardy A. Rosowsky A. Roussarie J.P. Schuller A. Trabelsi B. Vallage S.N. Black J.H. Dann A.M. Litke M.A. Mcneil G. Taylor C.N. Booth R. Boswell C.A.J. Brew S. Cartwright F. Combley M.S. Kelly M. Lehto W.M. Newton J. Reeve L.F. Thompson K. Affholderbach A. Bohrer S. Brandt G. Cowan J. Foss C. Grupen G. Lutters L. Smolik F. Stephan M. Apollonio L. Bosisio R. Dellamarina G. Giannini B. Gobbo G. Musolino J. Putz J. Rothberg R.W. Williams S.R. Armstrong E. Charles P. Elmer D.P.S. Ferguson S. Gonzalez T.C. Greening H. Hu S. Jin P.A. Mcnamara J.M. Nachtman J. Nielsen W. Orejudos Y. Saadi I.J. Scott J. Walsh Sau. Lan Wu X. Wu J.M. Yamartino G. Zobernig
1 LAPP - Laboratoire d'Annecy de Physique des Particules
2 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
3 LLR - Laboratoire Leprince-Ringuet
4 CPPM - Centre de Physique des Particules de Marseille
5 LAL - Laboratoire de l'Accélérateur Linéaire
Abstract : Searches for supersymmetric particles in channels with one or more photons and missing energy have been performed with data collected by the ALEPH detector at LEP. The data consist of 11.1 \pb\ at $\sqrt{s} = 161 ~\, \rm GeV$, 1.1 \pb\ at 170 \gev\ and 9.5 \pb\ at 172 GeV. The \eenunu\ cross se ction is measured. The data are in good agreement with predictions based on the Standard Model, and are used to set upper limits on the cross sections for anomalous photon production. These limits are compared to two different SUSY models and used to set limits on the neutralino mass. A limit of 71 \gevsq\ at 95\% C.L. is set on the mass of the lightest neutralin o ($\tau_{\chi_{1}^{0}} \leq $ 3 ns) for the gauge-mediated supersymmetry breaking and LNZ models.
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R. Barate, D. Buskulic, D. Decamp, P. Ghez, C. Goy, et al.. Search for supersymmetry in the photon(s) plus missing energy channels at $\sqrt{s}$=161 GeV and 172 GeV. Physics Letters B, Elsevier, 1998, 420, pp.127-139. ⟨in2p3-00000365⟩

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