Search for pair-produced neutralinos in events with photons and missing energy from e(+)e(-) collisions at root s = 130-183 GeV

Authors
Abreu, P Adye, T Adzic, P Ajinenko, I Alekseev, GD Alemany, R Allport, PP Almehed, S Amaldi, U Amato, S Anassontzis, EG Andersson, P Andreazza, A Andringa, S Antilogus, P Apel, WD Arnoud, Y Asman, B Augustin, JE Augustinus, A Baillon, P Bambade, P Barao, F Barbiellini, G Barbier, R Bardin, DY Barker, G Baroncelli, A Battaglia, M Baubillier, M Becks, KH Begalli, M Beilliere, P Belokopytov, Y Benvenuti, AC Berat, C Berggren, M Bertini, D Bertrand, D Besancon, M Bianchi, F Bigi, M Bilenky, MS Bizouard, MA Bloch, D Blom, HM Bonesini, M Bonivento, W Boonekamp, M Booth, PSL Borgland, AW Borisov, G Bosio, C Botner, O Boudinov, E Bouquet, B Bourdarios, C Bowcock, TJV Boyko, I Bozovic, I Bozzo, M Branchini, P Brenke, T Brenner, RA Bruckman, P Brunet, JM Bugge, L Buran, T Burgsmueller, T Buschmann, P Cabrera, S Caccia, M Calvi, M Rozas, AJC Camporesi, T Canale, V Carena, F Carroll, L Caso, C Gimenez, MVC Cattai, A Cavallo, FR Cerruti, C Chabaud, V Charpentier, P Chaussard, L Checchia, P Chelkov, GA Chierici, R Chliapnikov, P Chochula, P Chorowicz, V Chudoba, J Collins, P Colomer, M Contri, R Cortina, E Cosme, G Cossutti, F Cowell, JH Crawley, HB Crennell, D Crosetti, G Maestro, JC Czellar, S Damgaard, G Davenport, M Da Silva, W Deghorain, A Della Ricca, G Delpierre, P Demaria, N De Angelis, A De Boer, W De Brabandere, S De Clercq, C De Lotto, B De Min, A De Paula, L Dijkstra, H Di Ciaccio, L Di Diodato, A Dolbeau, J Doroba, K Dracos, M Drees, J Dris, M Duperrin, A Durand, JD Ehret, R Eigen, G Ekelof, T Ekspong, G Ellert, M Elsing, M Engel, JP Erzen, B Santo, ME Falk, E Fanourakis, G Fassouliotis, D Fayot, J Feindt, M Ferrari, P Ferrer, A Ferrer-Ribas, E Fichet, S Firestone, A Fischer, PA Flagmeyer, U Foeth, H Fokitis, E Fontanelli, F Franek, B Frodesen, AG Fruhwirth, R Fulda-Quenzer, F Fuster, J Galloni, A Gamba, D Gamblin, S Gandelman, M Garcia, C Garcia, J Gaspar, C Gaspar, M Gasparini, U Gavillet, P Gazis, EN Gele, D Gerber, JP Gerdyukov, L Ghodbane, N Gil, I Glege, F Gokieli, R Golob, B Goncalves, P Caballero, IG Gopal, G Gorn, L Gorski, M Gouz, Y Gracco, V Grahl, J Graziani, E Green, C Gris, P Grzelak, K Gunther, M Guy, J Hahn, F Hahn, S Haider, S Hallgren, A Hamacher, K Harris, FJ Hedberg, V Heising, S Hernandez, JJ Herquet, P Herr, H Hessing, TL Heuser, JM Higon, E Holmgren, SO Holt, PJ Holthuizen, D Hoorelbeke, S Houlden, M Hrubec, J Huet, K Hultqvist, K Jackson, JN Jacobsson, R Jalocha, P Janik, R Jarlskog, C Jarlskog, G Jarry, P Jean-Marie, B Johansson, EK Jonsson, P Joram, C Juillot, P Kapusta, F Karafasoulis, K Katsanevas, S Katsoufis, EC Keranen, R Khomenko, BA Khovanski, NN Kiiskinen, A King, B Kjaer, NJ Klapp, O Klein, H Kluit, P Knoblauch, D Kokkinias, P Koratzinos, M Kostioukhine, V Kourkoumelis, C Kouznetsov, O Krammer, M Kreuter, C Kriznic, E Krstic, J Krumstein, Z Kubinec, P Kucewicz, W Kurvinen, K Lamsa, JW Lane, DW Langefeld, P Lapin, V Laugier, JP Lauhakangas, R Leder, G Ledroit, F Lefebure, V Leinonen, L Leisos, A Leitner, R Lemonne, J Lenzen, G Lepeltier, V Lesiak, T Lethuillier, M Libby, J Liko, D Lipniacka, A Lippi, I Loerstad, B Loken, JG Lopes, JH Lopez, JM Lopez-Fernandez, R Loukas, D Lutz, P Lyons, L MacNaughton, J Mahon, JR Maio, A Malek, A Malmgren, TGM Malychev, V Mandl, F Marco, J Marco, R Marechal, B Margoni, M Marin, JC Mariotti, C Markou, A Martinez-Rivero, C Martinez-Vidal, F Garcia, SMI Mastroyiannopoulos, N Matorras, F Matteuzzi, C Matthiae, G Mazik, J Mazzucato, F Mazzucato, M Mc Cubbin, M Mc Kay, R Mc Nulty, R Mc Pherson, G Meroni, C Meyer, WT Miagkov, A Migliore, E Mirabito, L Mitaroff, WA Mjoernmark, U Moa, T Moeller, R Moenig, K Monge, MR Moreau, X Morettini, P Morton, G Mueller, U Muenich, K Mulders, M Mulet-Marques, C Muresan, R Murray, WJ Muryn, B Myatt, G Myklebust, T Naraghi, F Navarria, FL Navas, S Nawrocki, K Negri, P Neufeld, N Neumeister, N Nicolaidou, R Nielsen, BS Nikolaenko, V Nikolenko, M Nomokonov, V Normand, A Nygren, A Obraztsov, V Olshevski, AG Onofre, A Orava, R Orazi, G Osterberg, K Ouraou, A Paganoni, M Paiano, S Pain, R Paiva, R Palacios, J Palka, H Papadopoulou, TD Papageorgiou, K Pape, L Parkes, C Parodi, F Parzefall, U Passeri, A Passon, O Pegoraro, M Peralta, L Pernicka, M Perrotta, A Petridou, C Petrolini, A Phillips, HT Piana, G Pierre, F Pimenta, M Piotto, E Podobnik, T Pol, ME Polok, G Poropat, P Pozdniakov, V Privitera, P Pukhaeva, N Pullia, A Radojicic, D Ragazzi, S Rahmani, H Rakoczy, D Ratoff, PN Read, AL Rebecchi, P Redaelli, NG Regler, M Reid, D Reinhardt, R Renton, PB Resvanis, LK Richard, F Ridky, J Rinaudo, G Rohne, O Romero, A Ronchese, P Rosenberg, EI Rosinsky, P Roudeau, P Rovelli, T Ruhlmann-Kleider, V Ruiz, A Saarikko, H Sacquin, Y Sadovsky, A Sajot, G Salt, J Sampsonidis, D Sannino, M Schneider, H Schwemling, P Schwickerath, U Schyns, MAE Scuri, F Seager, P Sedykh, Y Segar, AM Sekulin, R Shellard, RC Sheridan, A Siebel, M Silvestre, R Simard, L Simonetto, F Sisakian, AN Skaali, TB Smadja, G Smirnova, O Smith, GR Sokolov, A Sopczak, A Sosnowski, R Spassov, T Spiriti, E Sponholz, P Squarcia, S Stampfer, D Stancscu, C Stanic, S Stapnes, S Stevenson, K Stocchi, A Strauss, J Strub, R Stugu, B Szczekowski, M Szeptycka, M Tabarelli, T Tchikilev, O Tegenfeldt, F Terranova, F Thomas, J Tilquin, A Timmermans, J Tkatchev, LG Todorov, T Todorova, S Toet, DZ Tomaradze, A Tome, B Tonazzo, A Tortora, L Transtromer, G Treille, D Tristram, G Troncon, C Tsirou, A Turluer, ML Tyapkin, IA Tzamarias, S Ueberschaer, B Ullaland, O Uvarov, V Valenti, G Vallazza, E Van Apeldoorn, GW Van Dam, P Van Doninck, WK Van Eldik, J Van Lysebetten, A Van Vulpen, I Vassilopoulos, N Vegni, G Ventura, L Venus, W Verbeure, F Verlato, M Vertogradov, LS Verzi, V Vilanova, D Vitale, L Vlasov, E Vodopyanov, AS Voulgaris, G Vrba, V Wahlen, H Walck, C Weiser, C Wicke, D Wickens, JH Wilkinson, GR Winter, M Witek, M Wolf, G Yi, J Yushchenko, O Zalewska, A Zalewski, P Zavrtanik, D Zevgolatakos, E Zimin, NI Zucchelli, GC Zumerle, G
Citation
P. Abreu et al., Search for pair-produced neutralinos in events with photons and missing energy from e(+)e(-) collisions at root s = 130-183 GeV, EUR PHY J C, 6(3), 1999, pp. 371-384
Citations number
32
Categorie Soggetti
Physics
Journal title
EUROPEAN PHYSICAL JOURNAL C
ISSN journal
14346044 → ACNP
Volume
6
Issue
3
Year of publication
1999
Pages
371 - 384
Database
ISI
SICI code
1434-6044(199901)6:3<371:SFPNIE>2.0.ZU;2-B
Abstract
The events with two photons and missing (transverse) energy collected by th e DELPHI detector at centre-of-mass energies between 130 GeV and 183 GeV ha ve been studied to search for processes of the type e(+)e(-) --> YY with th e subsequent decay Y --> X gamma, where X is an undetectable neutral partic le. Reactions of this kind are expected in supersymmetric models, where the Y particle can be either the lightest neutralino, decaying to a photon and a gravitino, or the next-to-lightest neutralino, decaying to a photon and the lightest neutralino. To study the case of long-lived Y particles, a sea rch for single-photon events with the reconstructed photon axis pointing fa r from the beam interaction region has also been performed. No evidence for a deviation from Standard Model expectations has been observed in the data and upper limits have been derived on the signal cross-section as a functi on of the the X and Y masses and of the Y mean decay path.