Single and multi-photon events with missing energy are analysed using data collected with the L3 detector at LEP at a centre-of-mass energy of 189 GeV, for a total of 176 pb(-1) of integrated luminosity. The cross section of the process e(+)e(-) --> nu<(nu)over bar>gamma(gamma) is measured and the number of light neutrino flavours is determined to be N-nu= 3.011 +/- 0.077 including lower energy data. Upper limits on cross sections of supersymmetric processes are set and interpretations in supersymmetric models provide improved limits on the masses of the lightest neutralino and the gravitino. Graviton-photon production in low scale gravity models with extra dimensions is searched for and limits on the energy scale of the model are set exceeding 1 TeV for two extra dimensions. (C) 1999 Elsevier Science B.V. All rights reserved.

Single and multi-photon events with missing energy e(+)e(-)collisions at root s=189 GeV / Acciarri, M; Achard, P; Adriani, O; Aguilar Benitez, M; Alcaraz, J; Alemanni, G; Allaby, J; Aloisio, A; Alviggi, Mg; Ambrosi, G; Anderhub, H; Andreev, Vp; Angelescu, T; Anselmo, F; Arefiev, A; Azemoon, T; Aziz, T; Bagnaia, Paolo; Baksay, L; Balandras, A; Ball, Rc; Banerjee, S; Banerjee, S; Barczyk, A; Barillere, R; Barone, L; Bartalini, P; Basile, M; Battiston, R; Bay, A; Becattini, F; Becker, U; Behner, F; Bellucci, L; Berdugo, J; Berges, P; Bertucci, B; Betev, Bl; Bhattacharya, S; Biasini, M; Biland, A; Blaising, Jj; Blyth, Sc; Bobbink, Gj; Bohm, A; Boldizsar, L; Borgia, B; Bourilkov, D; Bourquin, M; Braccini, S; Branson, Jg; Brigljevic, V; Brochu, F; Buffini, A; Buijs, A; Burger, Jd; Burger, Wj; Busenitz, J; Button, A; Cai, Xd; Campanelli, M; Capell, M; Romeo, Gc; Carlino, G; Cartacci, Am; Casaus, J; Castellini, G; Cavallari, F; Cavallo, N; Cecchi, C; Cerrada, M; Cesaroni, F; Chamizo, M; Chang, Yh; Chaturvedi, Uk; Chemarin, M; Chen, A; Chen, G; Chen, Gm; Chen, Hf; Chen, Hs; Chereau, X; Chiefari, G; Cifarelli, L; Cindolo, F; Civinini, C; Clare, I; Clare, R; Coignet, G; Colijn, Ap; Colino, N; Costantini, S; Cotorobai, F; Cozzoni, B; De La Cruz, B; Csilling, A; Cucciarelli, S; Dai, Ts; Van Dalen, Ja; D'Alessandro, R; De Asmundis, R; Deglon, P; Degre, A; Deiters, K; Della Volpe, D; Denes, P; Denotaristefani, F; De Salvo, A; Diemoz, M; Van Dierendonck, D; Di Lodovico, F; Dionisi, C; Dittmar, M; Dominguez, A; Doria, A; Dova, Mt; Duchesneau, D; Dufournaud, D; Duinker, P; Duran, I; El Mamouni, H; Engler, A; Eppling, Fj; Erne, Fc; Extermann, P; Fabre, M; Faccini, R; Falagan, Ma; Falciano, S; Favara, A; Fay, J; Fedin, O; Felcini, M; Ferguson, T; Ferroni, Fernando; Fesefeldt, H; Fiandrini, E; Field, Jh; Filthaut, F; Fisher, Ph; Fisk, I; Forconi, G; Fredj, L; Freudenreich, K; Furetta, C; Galaktionov, Y; Ganguli, Sn; Garcia Abia, P; Gataullin, M; Gau, Ss; Gentile, Simonetta; Gheordanescu, N; Giagu, Stefano; Gong, Zf; Grenier, G; Grimm, O; Gruenewald, Mw; Guida, M; Van Gulik, R; Gupta, Vk; Gurtu, A; Gutay, Lj; Haas, D; Hasan, A; Hatzifotiadou, D; Hebbeker, T; Herve, A; Hidas, P; Hirschfelder, J; Hofer, H; Holzner, G; Hoorani, H; Hou, Sr; Iashvili, I; Jin, Bn; Jones, Lw; De Jong, P; Josa Mutuberria, I; Khan, Ra; Kamrad, D; Kaur, M; Kienzle Focacci, Mn; Kim, D; Kim, Dh; Kim, Jk; Kim, Sc; Kirkby, J; Kiss, D; Kittel, W; Klimentov, A; Konig, Ac; Kopp, A; Korolko, I; Koutsenko, V; Kraber, M; Kraemer, Rw; Krenz, W; Kunin, A; De Guevara, Pl; Laktineh, I; Landi, G; Lassila Perini, K; Laurikainen, P; Lavorato, A; Lebeau, ; Lebedev, A; Lebrun, P; Lecomte, P; Lecoq, P; Le Coultre, P; Lee, Hj; Le Goff, Jm; Leiste, R; Leonardi, E; Levtchenko, P; Li, C; Lin, Ch; Lin, Wt; Linde, Fl; Lista, L; Liu, Za; Lohmann, W; Longo, E; Lu, Ys; Lubelsmeyer, K; Luci, Claudio; Luckey, D; Lugnier, L; Luminari, L; Lustermann, W; Ma, Wg; Maity, M; Malgeri, L; Malinin, A; Mana, C; Mangeol, D; Marchesini, P; Marian, G; Martin, Jp; Marzano, F; Massaro, Ggg; Mazumdar, K; Mcneil, Rr; Mele, S; Merola, L; Meschini, M; Metzger, Wj; Von Der Mey, M; Mihul, A; Milcent, H; Mirabelli, G; Mnich, J; Mohanty, Gb; Molnar, P; Monteleoni, B; Moulik, T; Muanza, Gs; Muheim, F; Muijs, Ajm; Musy, M; Napolitano, M; Nessi Tedaldi, F; Newman, H; Niessen, T; Nisati, A; Nowak, H; Oh, Yd; Organtini, Giovanni; Ostonen, R; Palomares, C; Pandoulas, D; Paoletti, S; Paolucci, P; Paramatti, Riccardo; Park, Hk; Park, Ih; Pascale, G; Passaleva, G; Patricelli, S; Paul, T; Pauluzzi, M; Paus, C; Pauss, F; Peach, D; Pedace, M; Pensotti, S; Perret Gallix, D; Petersen, B; Piccolo, D; Pierella, F; Pieri, M; Piroue, Pa; Pistolesi, E; Plyaskin, V; Pohl, M; Pojidaev, V; Postema, H; Pothier, J; Produit, N; Prokofiev, Do; Prokofiev, D; Quartieri, J; Rahal Callot, G; Rahaman, Ma; Raics, P; Raja, N; Ramelli, R; Rancoita, Pg; Raven, G; Razis, P; Ren, D; Rescigno, M; Reucroft, S; Van Rhee, T; Riemann, S; Riles, K; Robohm, A; Rodin, J; Roe, Bp; Romero, L; Rosca, A; Rosier Lees, S; Rubio, Ja; Ruschmeier, D; Rykaczewski, H; Saremi, S; Sarkar, S; Salicio, J; Sanchez, E; Sanders, Mp; Sarakinos, Me; Schafer, C; Schegelsky, V; Schmidt Kaerst, S; Schmitz, D; Schopper, H; Schotanus, Dj; Schwering, G; Sciacca, C; Sciarrino, D; Seganti, A; Servoli, L; Shevchenko, S; Shivarov, N; Shoutko, V; Shumilov, E; Shvorob, A; Siedenburg, T; Son, D; Smith, B; Spillantini, P; Steuer, M; Stickland, Dp; Stone, A; Stone, H; Stoyanov, B; Straessner, A; Sudhakar, K; Sultanov, G; Sun, Lz; Suter, H; Swain, Jd; Szillasi, Z; Sztaricskai, T; Tang, Xw; Tauscher, L; Taylor, L; Timmermans, C; Ting, Scc; Ting, Sm; Tonwar, Sc; Toth, J; Tully, C; Tung, Kl; Uchida, Y; Ulbricht, J; Valente, E; Vesztergombi, G; Vetlitsky, I; Vicinanza, D; Viertel, G; Villa, S; Vivargent, M; Vlachos, S; Vodopianov, I; Vogel, H; Vogt, H; Vorobiev, I; Vorobyov, Aa; Vorvolakos, A; Wadhwa, M; Wallraff, W; Wang, M; Wang, Xl; Wang, Zm; Weber, A; Weber, M; Wienemann, P; Wilkens, H; Wu, Sx; Wynhoff, S; Xia, L; Xu, Zz; Yang, Bz; Yang, Cg; Yang, Hj; Yang, M; Ye, Jb; Yeh, Sc; Zalite, A; Zalite, Y; Zhang, Zp; Zhu, Gy; Zhu, Ry; Zichichi, A; Ziegler, F; Zilizi, G; Zoller, M.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 470:(1999), pp. 268-280. [10.1016/S0370-2693(99)01286-1]

Single and multi-photon events with missing energy e(+)e(-)collisions at root s=189 GeV

BAGNAIA, Paolo;FACCINI R;FERRONI, Fernando;GENTILE, Simonetta;GIAGU, Stefano;LUCI, Claudio;ORGANTINI, Giovanni;PARAMATTI, Riccardo;
1999

Abstract

Single and multi-photon events with missing energy are analysed using data collected with the L3 detector at LEP at a centre-of-mass energy of 189 GeV, for a total of 176 pb(-1) of integrated luminosity. The cross section of the process e(+)e(-) --> nu<(nu)over bar>gamma(gamma) is measured and the number of light neutrino flavours is determined to be N-nu= 3.011 +/- 0.077 including lower energy data. Upper limits on cross sections of supersymmetric processes are set and interpretations in supersymmetric models provide improved limits on the masses of the lightest neutralino and the gravitino. Graviton-photon production in low scale gravity models with extra dimensions is searched for and limits on the energy scale of the model are set exceeding 1 TeV for two extra dimensions. (C) 1999 Elsevier Science B.V. All rights reserved.
1999
01 Pubblicazione su rivista::01a Articolo in rivista
Single and multi-photon events with missing energy e(+)e(-)collisions at root s=189 GeV / Acciarri, M; Achard, P; Adriani, O; Aguilar Benitez, M; Alcaraz, J; Alemanni, G; Allaby, J; Aloisio, A; Alviggi, Mg; Ambrosi, G; Anderhub, H; Andreev, Vp; Angelescu, T; Anselmo, F; Arefiev, A; Azemoon, T; Aziz, T; Bagnaia, Paolo; Baksay, L; Balandras, A; Ball, Rc; Banerjee, S; Banerjee, S; Barczyk, A; Barillere, R; Barone, L; Bartalini, P; Basile, M; Battiston, R; Bay, A; Becattini, F; Becker, U; Behner, F; Bellucci, L; Berdugo, J; Berges, P; Bertucci, B; Betev, Bl; Bhattacharya, S; Biasini, M; Biland, A; Blaising, Jj; Blyth, Sc; Bobbink, Gj; Bohm, A; Boldizsar, L; Borgia, B; Bourilkov, D; Bourquin, M; Braccini, S; Branson, Jg; Brigljevic, V; Brochu, F; Buffini, A; Buijs, A; Burger, Jd; Burger, Wj; Busenitz, J; Button, A; Cai, Xd; Campanelli, M; Capell, M; Romeo, Gc; Carlino, G; Cartacci, Am; Casaus, J; Castellini, G; Cavallari, F; Cavallo, N; Cecchi, C; Cerrada, M; Cesaroni, F; Chamizo, M; Chang, Yh; Chaturvedi, Uk; Chemarin, M; Chen, A; Chen, G; Chen, Gm; Chen, Hf; Chen, Hs; Chereau, X; Chiefari, G; Cifarelli, L; Cindolo, F; Civinini, C; Clare, I; Clare, R; Coignet, G; Colijn, Ap; Colino, N; Costantini, S; Cotorobai, F; Cozzoni, B; De La Cruz, B; Csilling, A; Cucciarelli, S; Dai, Ts; Van Dalen, Ja; D'Alessandro, R; De Asmundis, R; Deglon, P; Degre, A; Deiters, K; Della Volpe, D; Denes, P; Denotaristefani, F; De Salvo, A; Diemoz, M; Van Dierendonck, D; Di Lodovico, F; Dionisi, C; Dittmar, M; Dominguez, A; Doria, A; Dova, Mt; Duchesneau, D; Dufournaud, D; Duinker, P; Duran, I; El Mamouni, H; Engler, A; Eppling, Fj; Erne, Fc; Extermann, P; Fabre, M; Faccini, R; Falagan, Ma; Falciano, S; Favara, A; Fay, J; Fedin, O; Felcini, M; Ferguson, T; Ferroni, Fernando; Fesefeldt, H; Fiandrini, E; Field, Jh; Filthaut, F; Fisher, Ph; Fisk, I; Forconi, G; Fredj, L; Freudenreich, K; Furetta, C; Galaktionov, Y; Ganguli, Sn; Garcia Abia, P; Gataullin, M; Gau, Ss; Gentile, Simonetta; Gheordanescu, N; Giagu, Stefano; Gong, Zf; Grenier, G; Grimm, O; Gruenewald, Mw; Guida, M; Van Gulik, R; Gupta, Vk; Gurtu, A; Gutay, Lj; Haas, D; Hasan, A; Hatzifotiadou, D; Hebbeker, T; Herve, A; Hidas, P; Hirschfelder, J; Hofer, H; Holzner, G; Hoorani, H; Hou, Sr; Iashvili, I; Jin, Bn; Jones, Lw; De Jong, P; Josa Mutuberria, I; Khan, Ra; Kamrad, D; Kaur, M; Kienzle Focacci, Mn; Kim, D; Kim, Dh; Kim, Jk; Kim, Sc; Kirkby, J; Kiss, D; Kittel, W; Klimentov, A; Konig, Ac; Kopp, A; Korolko, I; Koutsenko, V; Kraber, M; Kraemer, Rw; Krenz, W; Kunin, A; De Guevara, Pl; Laktineh, I; Landi, G; Lassila Perini, K; Laurikainen, P; Lavorato, A; Lebeau, ; Lebedev, A; Lebrun, P; Lecomte, P; Lecoq, P; Le Coultre, P; Lee, Hj; Le Goff, Jm; Leiste, R; Leonardi, E; Levtchenko, P; Li, C; Lin, Ch; Lin, Wt; Linde, Fl; Lista, L; Liu, Za; Lohmann, W; Longo, E; Lu, Ys; Lubelsmeyer, K; Luci, Claudio; Luckey, D; Lugnier, L; Luminari, L; Lustermann, W; Ma, Wg; Maity, M; Malgeri, L; Malinin, A; Mana, C; Mangeol, D; Marchesini, P; Marian, G; Martin, Jp; Marzano, F; Massaro, Ggg; Mazumdar, K; Mcneil, Rr; Mele, S; Merola, L; Meschini, M; Metzger, Wj; Von Der Mey, M; Mihul, A; Milcent, H; Mirabelli, G; Mnich, J; Mohanty, Gb; Molnar, P; Monteleoni, B; Moulik, T; Muanza, Gs; Muheim, F; Muijs, Ajm; Musy, M; Napolitano, M; Nessi Tedaldi, F; Newman, H; Niessen, T; Nisati, A; Nowak, H; Oh, Yd; Organtini, Giovanni; Ostonen, R; Palomares, C; Pandoulas, D; Paoletti, S; Paolucci, P; Paramatti, Riccardo; Park, Hk; Park, Ih; Pascale, G; Passaleva, G; Patricelli, S; Paul, T; Pauluzzi, M; Paus, C; Pauss, F; Peach, D; Pedace, M; Pensotti, S; Perret Gallix, D; Petersen, B; Piccolo, D; Pierella, F; Pieri, M; Piroue, Pa; Pistolesi, E; Plyaskin, V; Pohl, M; Pojidaev, V; Postema, H; Pothier, J; Produit, N; Prokofiev, Do; Prokofiev, D; Quartieri, J; Rahal Callot, G; Rahaman, Ma; Raics, P; Raja, N; Ramelli, R; Rancoita, Pg; Raven, G; Razis, P; Ren, D; Rescigno, M; Reucroft, S; Van Rhee, T; Riemann, S; Riles, K; Robohm, A; Rodin, J; Roe, Bp; Romero, L; Rosca, A; Rosier Lees, S; Rubio, Ja; Ruschmeier, D; Rykaczewski, H; Saremi, S; Sarkar, S; Salicio, J; Sanchez, E; Sanders, Mp; Sarakinos, Me; Schafer, C; Schegelsky, V; Schmidt Kaerst, S; Schmitz, D; Schopper, H; Schotanus, Dj; Schwering, G; Sciacca, C; Sciarrino, D; Seganti, A; Servoli, L; Shevchenko, S; Shivarov, N; Shoutko, V; Shumilov, E; Shvorob, A; Siedenburg, T; Son, D; Smith, B; Spillantini, P; Steuer, M; Stickland, Dp; Stone, A; Stone, H; Stoyanov, B; Straessner, A; Sudhakar, K; Sultanov, G; Sun, Lz; Suter, H; Swain, Jd; Szillasi, Z; Sztaricskai, T; Tang, Xw; Tauscher, L; Taylor, L; Timmermans, C; Ting, Scc; Ting, Sm; Tonwar, Sc; Toth, J; Tully, C; Tung, Kl; Uchida, Y; Ulbricht, J; Valente, E; Vesztergombi, G; Vetlitsky, I; Vicinanza, D; Viertel, G; Villa, S; Vivargent, M; Vlachos, S; Vodopianov, I; Vogel, H; Vogt, H; Vorobiev, I; Vorobyov, Aa; Vorvolakos, A; Wadhwa, M; Wallraff, W; Wang, M; Wang, Xl; Wang, Zm; Weber, A; Weber, M; Wienemann, P; Wilkens, H; Wu, Sx; Wynhoff, S; Xia, L; Xu, Zz; Yang, Bz; Yang, Cg; Yang, Hj; Yang, M; Ye, Jb; Yeh, Sc; Zalite, A; Zalite, Y; Zhang, Zp; Zhu, Gy; Zhu, Ry; Zichichi, A; Ziegler, F; Zilizi, G; Zoller, M.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 470:(1999), pp. 268-280. [10.1016/S0370-2693(99)01286-1]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/241726
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