학술논문

A study of radiative muon-pair events at Z0 energies and limits on an additional Z′ gauge beson
Document Type
Article
Author
Abreu, P.Adam, W.Adye, T.Agasi, E.Ajinenko, I.Aleksan, R.Alekseev, G. D.Allport, P. P.Almehed, S.Almeida, F. M. L.Alvsvaag, S. J.Amaldi, U.Andreazza, A.Antilogus, P.Apel, W -D.Apsimon, R. J.Arnoud, Y.Asman, B.Augustin, J -E.Augustinus, A.Baillon, P.Bambade, P.Barao, F.Barate, R.Bardin, D. Y.Barker, G. J.Baroncelli, A.Barring, O.Barrio, J. A.Bartl, W.Bates, M. J.Battaglia, M.Baubillier, M.Baudot, J.Becks, K -H.Begalli, M.Beilliere, P.Beltran, P.Benvenuti, A. C.Berggren, M.Bertrand, D.Bianchi, F.Bigi, M.Bilenky, M. S.Billoir, P.Bjarne, J.Bloch, D.Blocki, J.Blyth, S.Bocci, V.Bogolubov, P. N.Bolognese, T.Bonesini, M.Bonivento, W.Booth, P. S. L.Borisov, G.Bosio, C.Bostjancic, B.Bosworth, S.Botner, O.Boudinov, E.Bouquet, B.Bourdarios, C.Bowcock, T. J. V.Bozzo, M.Braibant, S.Branchini, P.Brand, K. D.Brenner, R. A.Briand, H.Bricman, C.Brillault, L.Brown, R. C. A.Brunet, J -M.Bugge, L.Buran, T.Buys, A.Buytaert, J. A. M. A.Caccia, M.Calvi, M.Camacho Rozas, A. J.Campion, R.Camporesi, T.Capale, V.Cankocak, K.Cao, F.Carena, F.Carrilho, P.Carroll, L.Cases, R.Caso, C.Castillo Gimenez, M. V.Cattai, A.Cavallo, F. R.Cerrito, L.Chabaud, V.Chan, A.Chapkin, M.Charpentier, Ph.Chaussard, L.Chauveau, J.Checchia, P.Chelkov, G. A.Chliapnikov, P.Chorowicz, V.Chrin, J. T. M.Cindro, V.Collins, P.Contreras, J. L.Contri, R.Cortina, E.Cosme, G.Cosmo, G.Cossutti, C.Couchot, F.Crawley, H. B.Crennell, D.Crosetti, G.Cuevas Maestro, J.Czellar, S.Dahl-Jensen, E.Dahm, J.Dalmagne, B.Dam, M.Damgaard, G.Daubie, E.Daum, A.Dauncey, P. D.Davenport, M.Davies, J.Da Silva, W.Defoix, C.Delpierre, P.Demaria, N.De Angelis, A.De Boeck, H.De Boer, W.De Brabandere, S.De Clercq, C.De Fez Laso, M. D. M.De La Vaissiere, C.De Lotto, B.De Min, A.De Paula, L.De Saint-Jean, C.Diikstra, H.Di Ciaccio, L.Diama, F.Dolbeau, J.Donszelmann, M.Doroba, K.Dracos, M.Drees, J.Dris, M.Dufour, Y.Dupont, F.Edsall, D.Ehret, R.Ekelof, T.Ekspong, G.Elsing, M.Engel, J -P.Ershaidat, N.Espirito Santo, M.Fassouliotis, D.Feindt, M.Fenyuk, A.Ferrer, A.Filippas, T. A.Firestone, A.Foeth, H.Fokitis, E.Fontanelli, F.Formenti, F.Fousset, J -L.Franek, B.Frenkiel, P.Fries, D. C.Frodesen, A. G.Fruhwirth, R.Fulda-Quenzer, F.Furstenau, H.Fuster, J.Gamba, D.Gandelman, M.Garcia, C.Garcia, J.Gaspar, C.Gasparini, U.Gavillet, Ph.Gazis, E. N.Gele, D.Gerber, J -P.Giacomelli, P.Gillespie, D.Gokieli, R.Golob, B.Golovatyuk, V. M.Gomez Y Cadenas, J. J.Gopal, G.Gorn, L.Gorski, M.Gracco, V.Grard, F.Graziani, E.Grosdidier, G.Gunnarsson, P.Guy, J.Haedinger, U.Hahn, F.Hahn, M.Hahn, S.Haider, S.Hajduk, Z.Hakansson, A.Hallgren, A.Hamacher, K.Hao, W.Harris, F. J.Hedberg, V.Henriques, R.Hernandez, J. J.Hernando, J. A.Herquet, P.Herr, H.Hessing, T. L.Higon, E.Hilke, H. J.Hill, T. S.Holmgren, S -O.Holt, P. J.Holthuizen, D.Honore, P. F.Houlden, M.Hrubec, J.Huet, K.Hultqvist, K.Ioannou, P.Iversen, P -S.Jackson, J. N.Jacobsson, R.Jalocha, P.Jarlskog, G.Jarry, P.Jean-Marie, B.Johansson, E. K.Jonker, M.Jonsson, L.Juillot, P.Kaiser, M.Kalmus, G.Kapusta, F.Karlsson, M.Karvelas, E.Katsanevas, S.Katsoufis, E. C.Keranen, R.Khomenko, B. A.Khovanski, N. N.King, B.Kjaer, N. J.Klein, H.Klovning, A.Kluit, P.Koch-Mehrin, A.Koehne, J. H.Koene, B.Kokkinias, P.Koratzinos, M.Korcyl, K.Korytov, A. V.Kostioukhine, V.Kourkoumelis, C.Kouznetsov, O.Kramer, P. H.Krammer, M.Kreuter, C.Krolikowski, J.Kronkvist, I.Krupinski, W.Kulka, K.Kurvinen, K.Lacasta, C.Laktineh, I.Lambropoulos, C.Lamsa, J. W.Lanceri, L.Langefeld, P.Lapin, V.Last, I.Laugier, J -P.Lauhakangas, R.Leder, G.Ledroit, F.Leitner, R.Lemoigne, Y.Lemonne, J.Lenzen, G.Lepeltier, V.Lesiak, T.Levy, J. M.Lieb, E.Liko, D.Lindner, R.Lipniacka, A.Lippi, I.Loerstad, B.Lokajicek, M.Loken, J. G.Lopez-Fernandez, A.Lopez Aguera, M. A.Los, M.Loukas, D.Lozano, J. J.Lutz, P.Lyons, L.Maehlum, G.Maillard, J.Maio, A.Maltezos, A.Mandl, F.Marco, J.Marechal, B.Margoni, M.Marin, J -C.Mariotti, C.Markou, A.Maron, T.Marti, S.Martinez-Rivero, C.Martinez-Vidal, F.Matorras, F.Matteuzzi, C.Matthiae, G.Mazzucato, M.Cubbin, M. McKay, R. McNulty, R. McMedbo, J.Meroni, C.Meyer, W. T.Michelotto, M.Migliore, E.Mikulec, I.Mirabito, L.Mitaroff, W. A.Mitselmakher, G. V.Mjoernmark, U.Moa, T.Moeller, R.Moenig, K.Monge, M. R.Morettini, P.Mueller, H.Murray, W. J.Muryn, B.Myatt, G.Naraghi, F.Navarria, F. L.Negri, P.Nemecek, S.Neumann, R.Nicolaidou, R.Nielsen, B. S.Niss, P.Nomerotski, A.Normand, A.Obraztsov, V.Olshevski, A. G.Orava, R.Osterberg, K.Ouraou, A.Paganini, P.Paganoni, M.Pain, R.Palka, H.Papadopoulou, Th. D.Pape, L.Parodi, F.Passeri, A.Pegararo, M.Pennanen, J.Peralta, L.Pernegger, H.Pernicka, M.Perrotta, A.Petridou, C.Petrolini, A.Phillips, H. T.Piana, G.Pierre, F.Pimenta, M.Plaszczynski, S.Podobrin, O.Pol, M. E.Polok, G.Poropat, P.Pozdniakov, V.Prest, M.Privitera, P.Pullia, A.Radojicic, D.Ragazzi, S.Rahmani, H.Rames, J.Ratoff, P. N.Read, A. L.Reale, M.Rebecchi, P.Redaelli, N. G.Regler, M.Reid, D.Renton, P. B.Resvanis, L. K.Richard, F.Richardson, J.Ridky, J.Rinaudo, G.Ripp, I.Romero, A.Roncagliolo, I.Ronchese, P.Roos, L.Rosenberg, E. I.Rosso, E.Roudeau, P.Rovelli, T.Ruckstuhl, W.Ruhlmann-Kleider, V.Ruiz, A.Rybicki, K.Saarikko, H.Sacquin, Y.Sajot, G.Salt, J.Sanchez, J.Sannino, M.Schael, S.Schneider, H.Schyns, M. A. E.Sciolla, G.Scuri, F.Segar, A. M.Seitz, A.Sekulin, R.Seufert, R.Shellard, R. C.Siccama, I.Siegrist, P.Simonetti, S.Simonetto, F.Sisakian, A. N.Skaali, T. B.Smadja, G.Smirnov, N.Smirnova, O.Smith, G. R.Sosnowski, R.Souza-Santos, D.Spassov, T.Spiriti, E.Squarcia, S.Staeck, H.Stanescu, C.Stapnes, S.Stavitski, I.Stavropoulos, G.Stepaniak, K.Stichelbaut, F.Stocchi, A.Strauss, J.Straver, J.Strub, R.Stugu, B.Szczekowski, M.Szeptycka, M.Tabarelli, T.Tchikilev, O.Theodosiou, G. E.Thome, Z.Tilquin, A.Timmermans, J.Timofeev, V. G.Tkatchev, L. G.Todorov, T.Toet, D. Z.Tomaradze, A.Tome, B.Torassa, E.Tortora, L.Transtromer, G.Treille, D.Trischuk, W.Tristram, G.Troncon, C.Tsirou, A.Tsyganov, E. N.Turala, M.Turluer, M -L.Tuuva, T.Tyapkin, I. A.Tyndel, M.Tzamarias, S.Ueberschaer, B.Ueberschaer, S.Ullaland, O.Uvarov, V.Valenti, G.Vallazza, E.Valls Ferrer, J. A.Vander Velde, C.Van Apeldoorn, G. W.Van Dam, P.Van Der Heijden, M.Van Doninck, W. K.Van Eldik, J.Vaz, P.Vegni, G.Ventura, L.Venus, W.Verbeure, F.Verlato, M.Vertogradov, L. S.Vilanova, D.Vincent, P.Vitale, L.Vlasov, E.Vodopyanov, A. S.Vollmer, M.Voutilainen, M.Wahlen, H.Walck, C.Wehr, A.Weierstall, M.Weilhammer, P.Wetherell, A. M.Wickens, J. H.Wielers, M.Wilkinson, G. R.Williams, W. S. C.Winter, M.Witek, M.Wormser, G.Woschnagg, K.Yip, K.Yushchenko, O.Zach, F.Zaitsev, A.Zalewska, A.Zalewski, P.Zavrtanik, D.Zevgolatakos, E.Zimin, N. I.Zito, M.Zontar, D.Zuberi, R.Zumerle, G.
Source
Zeitschrift für Physik C Particles and Fields; December 1995, Vol. 65 Issue: 4 p603-618, 16p
Subject
Language
ISSN
01709739; 14315858
Abstract
An analysis is reported on the channele+e-+µ-(n?), n=1,2..., using data taken with the DELPHI detector at LEP from 1990 to 1992. Differential cross sections of the radiative photons as a function of photon energy and of the angle between the photon and the muon are presented. No significant deviations from expectations are observed. The data are also used to extract the muon-pair cross section and asymmetry below the Z0 peak by using those events with relatively hard initial state radiative photon(s). The measured cross section and asymmetry show no significant deviation from the Standard Model expectations. These results together with the DELPHI cross section and asymmetry measurements at the LEP energies from the 1990 to 1992 running periods are used to determine limits on the Z0-Z' gauge boson mixing angle ?Z' and on the Z' mass. There is no indication of the existence of a Z'; the limits obtained on the mixing angle substantially improve upon existing limits. The 95% confidence level allowed ranges of ?Z' in various models are: $$\begin{gathered} - 0.0070 \leqslant \theta _{Z'} \leqslant 0.0078,E_6 (\chi )\bmod el, \hfill \\ - 0.0075 \leqslant \theta _{Z'} \leqslant 0.0095,E_6 (\psi )\bmod el, \hfill \\ - 0.029 \leqslant \theta _{Z'} \leqslant 0.029,E_6 (\eta )\bmod el, \hfill \\ - 0.0068 \leqslant \theta _{Z'} \leqslant 0.0082,L - R(1.)\bmod el, \hfill \\ - 0.0057 \leqslant \theta _{Z'} \leqslant 0.0077,L - R(\sqrt 2 )\bmod el. \hfill \\ \end{gathered} $$