Data di Pubblicazione:
1994
Abstract:
The total and the differential cross sections for the reaction e+e- --> gammagamma(gamma) have been measured with the DELPHI detector at LEP using an integrated luminosity of 36.9 pb-1. The results agree with the QED predictions and consequently there is no evidence for non-standard channels with the same experimental signature. The lower limits obtained on the QED cutoff parameters are LAMBDA+ > 143 GeV and LAMBDA- > 120 GeV, and the lower bound on the mass of an excited electron with an effective coupling constant lambda(gamma) = 1 is 132 GeV/c2. Upper limits on the branching ratios for the decays Z0 --> gammagamma, Z0 --> pi0gamma, Z0 --> etagamma and Z0 --> gammagammagamma have been determined to be 5.5 x 10(-5), 5.5 x 10(-5), 8.0 x 10(-5), and 1.7 x 10-5 respectively. All the limits are at the 95% confidence level.
Tipologia CRIS:
Articolo su Rivista
Keywords:
DELPHI; QED; gamma-gamma; Z0 decay
Elenco autori:
Abreu, P; Adam, W; Adye, T; Agasi, E; Ajinenko, I; Aleksan, R; Alekseev, Gd; Allport, Pp; Almehed, S; Almeida, Fml; Alvsvaag, Sj; Amaldi, U; Andreazza, A; Antilogus, P; Apel, Wd; Apsimon, Rj; Arnoud, Y; Asman, B; Augustin, Je; Augustinus, A; Baillon, P; Bambade, P; Barao, F; Barate, R; Barbiellini, G; Bardin, Dy; Barker, Gj; Baroncelli, A; Barring, O; Barrio, Ja; Bartl, W; Bates, Mj; Battaglia, M; Baubillier, M; Becks, Kh; Begalli, M; Beilliere, P; Beltran, P; Benvenuti, Ac; Berggren, M; Bertrand, D; Bianchi, F; Bigi, M; Bilenky, Ms; Billoir, P; Bjarne, J; Bloch, D; Blocki, J; Blyth, S; Bocci, V; Bogolubov, Pn; Bolognese, T; Bonesini, M; Bonivento, W; Booth, Psl; Borisov, G; Bosio, C; Bostjancic, B; Bosworth, S; Botner, O; Bouquet, B; Bourdarios, C; Bowcock, Tjv; Bozzo, M; Braibant, S; Branchini, P; Brand, Kd; Brenne, Rra; Briand, H; Bricman, C; Brillault, L; Brown, Rca; Brunet, Jm; Bugge, L; Buran, T; Buys, A; Buytaert, Jama; Caccia, Massimo; Calvi, M; Rozas, Ajc; Campion, R; Camporesi, T; Canale, V; Cankocak, K; Cao, F; Carena, F; Carrilho, P; Carroll, L; Cases, R; Caso, C; Gimenez, Mvc; Cattai, A; Cavallo, Fr; Cerrito, L; Chabaud, V; Chan, A; Chapkin, M; Charpentier, P; Chauveau, J; Checchia, P; Chelkov, Ga; Chevalier, L; Chliapnikov, P; Chorowicz, V; Chrin, Jtm; Cindro, V; Collins, P; Contreras, Jl; Contri, R; Cortina, E; Cosme, G; Couchot, F; Crawley, Hb; Crennell, D; Crosetti, G; Maestro, Jc; Czellar, S; Dahljensen, E; Dahm, J; Dalmagne, B; Dam, M; Damgaard, G; Daubie, E; Daum, A; Dauncey, Pd; Davenport, M; Davies, J; Dasilva, W; Defoix, C; Delpierre, P; Demaria, N; Deangelis, A; Deboeck, H; Deboer, W; Debrabandere, S; Declercq, C; Defezlaso, Mdm; Delavaissiere, C; Delotto, B; Demin, A; Depaula, L; Dijkstra, H; Diciaccio, L; Djama, F; Dolbeau, J; Donszelmann, M; Doroba, K; Dracos, M; Drees, J; Dris, M; Dufour, Y; Dupont, F; Edsall, D; Eek, Lo; Ehret, R; Ekelof, T; Ekspong, G; Elsing, M; Engel, Jp; Ershaidat, N; Santo, Me; Falaleev, V; Fassouliotis, D; Feindt, M; Ferrer, A; Filippas, Ta; Firestone, A; Foeth, H; Fokitis, E; Fontanelli, F; Formenti, F; Fousset, Jl; Francon, S; Frankel, B; Frenkiel, P; Fries, Dc; Frodesen, Ag; Fruhwirth, R; Fuldaquenzer, F; Furstenau, H; Fuster, J; Gamba, D; Gandelman, M; Garcia, C; Garcia, J; Gaspar, C; Gasparini, U; Gavillet, P; Gazis, En; Gerber, Jp; Giacomelli, P; Gillespie, D; Golieli, R; Golob, B; Golovatyuk, Vm; Cadenas, Jjg; Gopal, G; Gorn, L; Gorski, M; Gracco, V; Grard, F; Graziani, E; Grosdidier, G; Grossetete, B; Gunnarsson, P; Guy, J; Haedinger, U; Hahn, F; Hahn, M; Hahn, S; Haider, S; Hajduk, Z; Hakansson, A; Hallgren, A; Hamacher, K; Demonchenault, Gh; Hao, W; Harris, Fj; Hedberg, V; Henriques, R; Herxnandez, Jj; Hernando, Ja; Herquet, P; Herr, H; Hessing, Tl; Higon, E; Hilke, Hj; Hill, Ts; Holmgren, So; Holt, Pj; Holthuizen, D; Honore, Pf; Houlden, M; Hrubec, J; Huet, K; Hultqvist, K; Ioannou, P; Iversen, Ps; Jackson, Jn; Jacobsson, R; Jalocha, P; Jarlskog, G; Jarry, P; Jeanmarie, B; Johansson, Ek; Jonker, M; Jonsson, L; Juillot, P; Kaiser, M; Kalmus, G; Kapusta, F; Karlsson, M; Karvelas, E; Katargin, A; Katsanevas, S; Katsoufis, Ec; Keranen, R; Khomenko, Ba; Khovanski, Nn; King, B; Kjaer, Nj; Klein, H; Klovning, A; Kluit, P; Kochmehrin, A; Koehne, Jh; Koene, B; Kokkinias, P; Koratzinos, M; Korcyl, K; Korytov, Av; Kostioukhine, V; Kourkoumelis, C; Kouznetsov, O; Kramer, Ph; Krammer, M; Kreuter, C; Krolikowski, J; Kronkvist, I; Krupinski, W; Kulka, K; Kurvinen, K; Lacasta, C; Lambropoulos, C; Lamsa, Jw; Lanceri, L; Langefeld, P; Lapin, V; Last, I; Laugier, Jp; Lauhakangas, R; Leder, G; Ledroit, F; Leitner, R; Lemoigne, Y; Lemonne, J; Lenzen, G; Lepeltier, V; Lesiak, T; Levy, Jm; Lieb, E; Lopezfernandez, A; Aguera, Mal; Los, M; Loukas, D; Lozano, Jj; Lutz, P; Lyons, L; Maehlum, G; Marin, Jc; Mariotti, C; Markou, A; Maron, T; Marti, S; Martinezrivero, C; Martinezvidal, F; Matorras, F; Matteuzzi, C; Matthiae, G; Mazzucato, M; Mccubbin, M; Mckay, R; Mcnulty, R; Medbo, J; Meroni, C
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