Study of radiative leptonic events with hard photons and search for excited charged leptons at root s=130-136 GeV

Abreu, P; Adam, W; Adye, T; Agasi, E; Ajinenko, I; Aleksan, R; Alekseev, Gd; Alemany, R; Allport, Pp; Almehed, S; Amaldi, U; Amato, S; Andreazza, A; Andrieux, Ml; Antilogus, P; Apel, Wd; Arnoud, Y; Asman, B; Augustin, Je; Augustinus, A; Baillon, P; Bambade, P; Barao, F; Barate, R; Barbi, M; Barbiellini, G; Bardin, Dy; Baroncelli, A; Barring, O; Barrio, Ja; Bartl, W; Bates, Mj; Battaglia, M; Baubillier, M; Baudot, J; Becks, Kh; Begalli, M; Beilliere, P; Belokopytov, Y; Benvenuti, Ac; Berggren, M; Bertini, D; Bertrand, D; Bianchi, F; Bigi, M; Bilenky, Ms; Billoir, P; Bloch, D; Blume, M; Bolognese, T; Bonesini, M; Bonivento, W; Psl, Booth; Bosio, C; Botner, O; Boudinov, E; Bouquet, B; Bourdarios, C; Tjv, Bowcock; Bozzo, M; Branchini, P; Brand, Kd; Brenke, T; Brenner, Ra; Bricman, C; Rca, Brown; Bruckman, P; Brunet, Jm; Bugge, L; Buran, T; Burgsmueller, T; Buschmann, P; Buys, A; Cabrera, S; Caccia, Massimo; Calvi, M; Ajc, Rozas; Camporesi, T; Canale, V; Canepa, M; Cankocak, K; Cao, F; Carena, F; Carroll, L; Caso, C; Mvc, Gimenez; Cattai, A; Cavallo, Fr; Chabaud, V; Charpentier, P; Chaussard, L; Chauveau, J; Checchia, P; Chelkov, Ga; Chen, M; Chierici, R; Chliapnikov, P; Chochula, P; Chorowicz, V; Cindro, V; Collins, P; Contreras, Jl; Contri, R; Cortina, E; Cosme, G; Cossutti, F; Crawley, Hb; Crennell, D; Crosetti, G; Maestro, Jc; Czellar, S; Dahljensen, E; Dehm, J; Dalmagne, B; Dam, M; Damgaard, G; Dauncey, Pd; Davenport, M; Dasilva, W; Defoix, C; Deghorain, A; Dellaricca, G; Delpierre, P; Demaria, N; Deangelis, A; Deboer, W; Debrabandere, S; Declercq, C; Delavaissiere, C; Delotto, B; Demin, A; Depaula, L; Desaintjean, C; Dijkstra, H; Diciaccio, L; Djama, F; Dolbeau, J; Donszelmann, M; Doroba, K; Dracos, M; Drees, J; Drees, Ja; Dris, M; Durand, Jd; Edsall, D; Ehret, R; Eigen, G; Ekelof, T; Ekspong, G; Elsing, M; Engel, Jp; Erzen, B; Santo, Me; Falk, E; Fassouliotis, D; Feindt, M; Fenyuk, A; Ferrer, A; Fichet, S; Filippas, Ta; Firestone, A; Fischer, Pa; Foeth, H; Fokitis, E; Fontanelli, F; Formenti, F; Franek, B; Frenkiel, P; Fries, Dc; Frodesen, Ag; Fruhwirth, R; Fuldaquenzer, F; Fuster, J; Galloni, A; Gamba, D; Gandelman, M; Garcia, C; Garcia, J; Gaspar, C; Gasparini, U; Gavillet, P; Gazis, En; Gele, D; Gerber, Jp; Gibbs, M; Gokieli, R; Golob, B; Gopal, G; Gorn, L; Gorski, M; Gouz, Y; Gracco, V; Graziani, E; Grosdidier, G; Grzelak, K; Gumenyuk, S; Gunnarsson, P; Gunther, M; Guy, J; Hahn, F; Hahn, S; Hajduk, Z; Hallgren, A; Hamacher, K; Hao, W; Harris, Fj; Hedberg, V; Henriques, R; Hernandez, Jj; Herquet, P; Herr, H; Hessing, Tl; Higon, E; Hilke, Hj; Hill, Ts; 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; Jeanmarie, B; Johansson, Ek; Jonsson, L; Jonsson, P; Joram, C; Juillot, P; Kaiser, M; Kapusta, F; Karafasoulis, K; Karlsson, M; Karvelas, E; Katsanevas, S; Katsoufis, Ec; Keranen, R; Khokhlov, Y; Khomenko, Ba; Khovanski, Nn; King, B; Kjaer, Nj; Klein, H; Klovning, A; Kluit, P; Koene, B; Kokkinias, P; Koratzinos, M; Korcyl, K; Kostioukhine, V; Kourkoumelis, C; Kouznetsov, O; Kramer, Ph; Krammer, M; Kreuter, C; Kronkvist, I; Krumstein, Z; Krupinski, W; Kubinec, P; Kucewicz, W; Kurvinen, K; Lacasta, C; Laktineh, I; Lamblot, S; Lamsa, Jw; Lanceri, L; Lane, Dw; Langefeld, P; Lapin, V; Last, I; Laugier, Jp; Lauhakangas, R; Ledroit, F; Lefebure, V; Legan, Ck; Leitner, R; Lemoigne, Y; Lemonne, J; Lenzen, G; Lepeltier, V; Lesiak, T; Libby, J; Liko, D; Lindner, R; Lipniacka, A; Lippi, I; Loerstad, B; Loken, Jg; Lopez, Jm; Loukas, D; Lutz, P; Lyons, L; Macnaughton, J; Maehlum, G; Maio, A; Malychev, V; Mandl, F; Marco, J; Marco, R; Marechal, B; Margoni, M; Marin, Jc; Mariotti, C; Markou, A; Maron, T; Martinezrivero, C; Martinezvidal, F; Smi, Garcia; Matorras, F; Matteuzzi, C; Matthiae, G; Mazzucato, M; Mccubbin, M; Mckay, R; Mcnulty, R; Medbo, J; Merk, M; Meroni, C; Meyer, S; Meyer, Wt; Miagkov, A; Michelotto, M; Migliore, E; Mirabito, L; Mitaroff, Wa; Mjoernmark, U; Moa, T; Moeller, R; Moenig, K; Monge, Mr; Morettini, P; Mueller, H; Mundim, Lm; Murray, Wj; Muryn, B; Myatt, G; Naraghi, F; Navarria, Fl; Navas, S; Nawrocki, K; Negri, P; Nemecek, S; Neumann, W; Neumeister, N; Nicolaidou, R; Nielsen, Bs; Nieuwenhuizen, M; Nikolaenko, V; Niss, P; Nomerotski, A; Normand, A; Novak, M; Oberschultebeckmann, W; Obraztsov, V; Olshevski, Ag; Onofre, A; Orava, R; Osterberg, K; Ouraou, A; Paganini, P; Paganoni, M; Pages, P; Palka, H; Papadopoulou, Td; Papageorgiou, K; Pape, L; Parkes, C; Parodi, F; Passeri, A; Pegoraro, M; Peralta, L; Pernegger, H; Pernicka, M; Perrotta, A; Petridou, C; Petrolini, A; Petrovyck, M; Phillips, Ht; Piana, G; Pierre, F; Pimenta, M; Pindo, M; Plaszczynski, S; Podobrin, O; Pol, Me; Polok, G; Poropat, P; Pozdniakov, V; Prest, Michela; Privitera, P; Pukhaeva, N; Pullia, A; Radojicic, D; Ragazzi, S; Rahmani, H; Rames, J; Ratoff, Pn; Read, Al; Reale, M; Rebecchi, P; Redaelli, Ng; Regler, M; Reid, D; Renton, Pb; Resvanis, Lk; Richard, F; Richardson, J; Ridky, J; Rinaudo, G; Ripp, I; Romero, A; Roncagliolo, I; Ronchese, P; Roos, L; Rosenberg, Ei; Rosso, E; Roudeau, P; Rovelli, T; Ruckstuhl, W; Ruhlmannkleider, V; Ruiz, A; Rybicki, K; Saarikko, H; Sacquin, Y; Sadovsky, A; Sahr, O; Sajot, G; Salt, J; Sanchez, J; Sannino, M; Schimmelpfennig, M; Schneider, H; Schwickerath, U; Mae, Schyns; Sciolla, G; Scuri, F; Seager, P; Sedykh, Y; Segar, Am; Seitz, A; Sekulin, R; Serbelloni, L; Shellard, Rc; Siccama, I; Siegrist, P; Simonetti, S; Simonetto, F; Sisakian, An; Sitar, B; Skaali, Tb; Smadja, G; Smirnov, N; Smirnova, O; Smith, Gr; Sokolov, A; Sosnowski, R; Souzasantos, D; Spiriti, E; Sponholz, P; Squarcia, S; Stanescu, C; Stapnes, S; Stavitski, I; Stevenson, K; Stichelbaut, F; Stocchi, A; Strauss, J; Strub, R; Stugu, B; Szczekowski, M; Szeptycka, M; Tabarelli, T; Tavernet, Jp; Tchikilev, O; 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; Trischuk, W; Tristram, G; Trombini, A; Troncon, C; Tsirou, A; Turluer, Ml; Tyapkin, Ia; Tyndel, M; Tzamarias, S; Ueberschaer, B; Ullaland, O; Uvarov, V; Valenti, G; Vallazza, E; Vandervelde, C; Vanapeldoorn, Gw; Vandam, P; Vandoninck, Wk; Vaneldik, J; Vassilopoulos, N; Vegni, G; Ventura, L; Venus, W; Verbeure, F; Verlato, M; Vertogradov, Ls; Vilanova, D; Vincent, P; Vitale, L; Vlasov, E; Vodopyanov, As; Vrba, V; Wahlen, H; Walck, C; Weierstall, M; Weilhammer, P; Weiser, C; Wetherell, Am; Wicke, D; Wickens, Jh; Wielers, M; Wilkinson, Gr; Wsc, Williams; Winter, M; Witek, M; Woschnagg, K; Yip, K; Yushchenko, O; Zach, F; Zaitsev, A; Zalewska, A; Zalewski, P; Zavrtanik, D; Zevgolatakos, E; Zimin, Ni; Zito, M; Zontar, D; Zucchelli, Gc; Zumerle, G.

doi:10.1016/0370-2693(96)00672-7

During the last 1995 data acquisition period at LEP, the DELPHI experiment collected an integrated luminosity of 5.9 pb(-1) at centre-of-mass energies of 130 GeV and 136 GeV. Radiative leptonic events (e, mu, tau) with high energy photons were studied and compared to Standard Model predictions. The data were used to search for charged excited leptons decaying through an electromagnetic transition. No significant signal was found. From the search for pair produced excited leptons, the limits m(e)* > 62.5 GeV/c(2), m(mu)* > 62.6 GeV/c(2) and m(tau)* > 62.2 GeV/c(2) at 95% confidence level were established. For single excited lepton production, upper limits on the ratio lambda/m(l)* of the coupling of the excited charged lepton to its mass were derived.