The data collected in 1998 by ALEPH at LEP at a centre-of-mass energy of 188.6 GeV, corresponding to an integrated luminosity of 176.2 pb(-1), are analysed to search for invisible decays of a Higgs boson produced in the reaction e(+) e(-) --> hZ. The number of events found in the data and their properties art: in agreement with the Standard Model expectation. This search results in an improved 95% C.L. lower limit on the Higgs boson mass of 95.4 GeV/c(2), assuming it decays totally invisibly and for a production cross section equal to that of the Standard Model.

Search for an invisibly decaying Higgs boson in e(+)e(-) collisions at 189 GeV / R. Barate, D. Decamp, P. Ghez, C. Goy, S. Jezequel, J. Lees, F. Martin, E. Merle, M. Minard, B. Pietrzyk, R. Alemany, S. Bravo, M. Casado, M. Chmeissani, J. Crespo, E. Fernandez, M. Fernandez-Bosman, L. Garrido, E. Grauges, A. Juste, M. Martinez, G. Merino, R. Miquel, L. Mir, P. Morawitz, A. Pacheco, I. Riu, H. Ruiz, A. Colaleo, D. Creanza, M. de Palma, G. Iaselli, G. Maggi, M. Maggi, S. Nuzzo, A. Ranieri, G. Raso, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, A. Tricomi, G. Zito, X. Huang, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, D. Abbaneo, U. Becker, G. Boix, O. Buchmuller, M. Cattaneo, F. Cerutti, V. Ciulli, G. Dissertori, H. Drevermann, R. Forty, M. Frank, F. Gianotti, T. Greening, A. Halley, J. Hansen, J. Harvey, P. Janot, B. Jost, I. Lehraus, O. Leroy, P. Maley, P. Mato, A. Minten, A. Moutoussi, F. Ranjard, L. Rolandi, D. Schlatter, M. Schmitt, O. Schneider, P. Spagnolo, W. Tejessy, F. Teubert, E. Tournefier, A. Wright, Z. Ajaltouni, F. Badaud, G. Chazelle, O. Deschamps, S. Dessagne, A. Falvard, C. Ferdi, P. Gay, C. Guicheney, P. Henrard, J. Jousset, B. Michel, S. Monteil, J. Montret, D. Pallin, F. Perret, F. Podlyski, J. Hansen, J. Hansen, P. Hansen, B. Nilsson, B. Rensch, A. Waananen, G. Daskalakis, A. Kyriakis, C. Markou, E. Simopoulou, A. Vayaki, A. Blondel, J. Brient, F. Machefert, A. Rouge, M. Swynghedauw, R. Tanaka, A. Valassi, H. Videau, E. Focardi, G. Parrini, K. Zachariadou, M. Corden, C. Georgiopoulos, A. Antonelli, G. Bencivenni, G. Bologna, F. Bossi, P. Campana, G. Capon, V. Chiarella, P. Laurelli, G. Mannocchi, F. Murtas, G. Murtas, L. Passalacqua, M. Pepe-Altarelli, M. Chalmers, L. Curtis, J. Lynch, F. Negus, V. O'Shea, B. Raeven, C. Raine, D. Smith, P. Teixeira-Dias, A. Thompson, J. Ward, R. Cavanaugh, S. Dhamotharan, C. Geweniger, P. Hanke, V. Hepp, E. Kluge, A. Putzer, K. Tittel, S. Werner, M. Wunsch, R. Beuselinck, D. Binnie, W. Cameron, P. Dornan, M. Girone, S. Goodsir, N. Marinelli, E. Martin, J. Nash, J. Nowell, H. Przysiezniak, A. Sciaba, J. Sedgbeer, E. Thomson, M. Williams, V. Ghete, P. Girtler, E. Kneringer, D. Kuhn, G. Rudolph, C. Bowdery, P. Buck, G. Ellis, A. Finch, F. Foster, G. Hughes, R. Jones, N. Robertson, M. Smizanska, M. Williams, I. Giehl, F. Holldorfer, K. Jakobs, K. Kleinknecht, M. Krocker, A. Muller, H. Nurnberger, G. Quast, B. Renk, E. Rohne, H. Sander, S. Schmeling, H. Wachsmuth, C. Zeitnitz, T. Ziegler, J. Aubert, A. Bonissent, J. Carr, P. Coyle, A. Ealet, D. Fouchez, A. Tilquin, M.R.A. Aleppo, M. Antonelli, S. Gilardoni, F. Ragusa, V. Buscher, H. Dietl, G. Ganis, K. Huttmann, G. Lutjens, C. Mannert, W. Manner, H. Moser, S. Schael, R. Settles, H. Seywerd, H. Stenzel, W. Wiedenmann, G. Wolf, P. Azzurri, J. Boucrot, O. Callot, S. Chen, M. Davier, L. Duflot, J. Grivaz, P. Heusse, A. Jacholkowska, M. Kado, J. Lefrancois, L. Serin, J. Veillet, I. Videau, J. de Regie, D. Zerwas, G. Bagliesi, T. Boccali, C. Bozzi, G. Calderini, R. Dell'Orso, I. Ferrante, A. Giassi, A. Gregorio, F. Ligabue, P. Marrocchesi, A. Messineo, F. Palla, G. Rizzo, G. Sanguinetti, G. Sguazzoni, R. Tenchini, A. Venturi, P. Verdini, G. Blair, J. Coles, G. Cowan, M. Green, D. Hutchcroft, L. Jones, T. Medcalf, J. Strong, D. Botterill, R. Clifft, T. Edgecock, P. Norton, J. Thompson, I. Tomalin, B. Bloch-Devaux, P. Colas, B. Fabbro, G. Faif, E. Lancon, M. Lemaire, E. Locci, P. Perez, J. Rander, J. Renardy, A. Rosowsky, P. Saeger, A. Trabelsi, B. Tuchming, B. Vallage, S. Black, J. Dann, C. Loomis, H. Kim, N. Konstantinidis, A. Litke, M. McNeil, G. Taylor, C. Booth, S. Cartwright, D. Combley, P. Hodgson, M. Lehto, L. Thompson, K. Affholderbach, A. Bohrer, S. Brandt, C. Grupen, J. Hess, A. Misiejuk, G. Prange, U. Sieler, G. Giannini, B. Gobbo, J. Putz, J. Rothberg, S. Wasserbaech, R. Williams, S. Armstrong, P. Elmer, D. Ferguson, Y. Gao, S. Gonzalez, O. Hayes, H. Hu, S. Jin, J. Kile, P. McNamara, J. Nielsen, W. Orejudos, Y. Pan, Y. Saadi, I. Scott, W. von Wimmersperg-Toeller, S. Wu, X. Wu, G. Zobernig. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 466:1(1999), pp. 50-60.

Search for an invisibly decaying Higgs boson in e(+)e(-) collisions at 189 GeV

M.R.A. Aleppo;F. Ragusa;
1999

Abstract

The data collected in 1998 by ALEPH at LEP at a centre-of-mass energy of 188.6 GeV, corresponding to an integrated luminosity of 176.2 pb(-1), are analysed to search for invisible decays of a Higgs boson produced in the reaction e(+) e(-) --> hZ. The number of events found in the data and their properties art: in agreement with the Standard Model expectation. This search results in an improved 95% C.L. lower limit on the Higgs boson mass of 95.4 GeV/c(2), assuming it decays totally invisibly and for a production cross section equal to that of the Standard Model.
Settore FIS/01 - Fisica Sperimentale
Settore FIS/04 - Fisica Nucleare e Subnucleare
1999
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/178075
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