Search for gamma gamma decays of a Higgs boson produced in association with a fermion pair in e(+)e(-) collisions at LEP

Authors
Barate, R Decamp, D Ghez, P Coy, C Jezequel, S Lees, JP Martin, F Merle, E Minard, MN Pietrzyk, B Bravo, S Casado, MP Chmeissani, M Crespo, JM Fernandez, E Fernandez-Bosman, M Garrido, L Grauges, E Lopez, J Martinez, M Merino, G Miquel, R Mir, LM Pacheco, A Paneque, D Ruiz, H Colaleo, A Creanza, D De Filippis, N de Palma, M Iaselli, G Maggi, G Maggi, M Nuzzo, S Ranieri, A Raso, G Ruggieri, F Selvaggi, G Silvestris, L Tempesta, P Tricomi, A Zito, G Huang, X Lin, J Ouyang, Q Wang, T Xie, Y Xu, R Xue, S Zhang, J Zhang, L Zhao, W Abbaneo, D Boix, G Buchmuller, O Cattaneo, M Cerutti, F Dissertori, G Drevermann, H Forty, RW Frank, M Gianotti, F Greening, TC Halley, AW Hansen, JB Harvey, J Janot, P Jost, B Kado, M Lemaitre, V Maley, P Mato, P Minten, A Moutoussi, A Ranjard, F Rolandi, L Schlatter, D Schmitt, M Schneider, O Spagnolo, P Tejessy, W Teubert, F Tournefier, E Valassi, A Ward, JJ Wright, AE Ajaltouni, Z Badaud, F Chazelle, G Deschamps, O Dessagne, S Falvard, A Gay, P Guicheney, C Henrard, P Jousset, J Michel, B Monteil, S Montret, JC Pallin, D Pascolo, JM Perret, P Podlyski, F Hansen, JD Hansen, JR Hansen, PH Nilsson, BS Waananen, A Daskalakis, G Kyriakis, A Markou, C Simopoulou, E Vayaki, A Blondel, A Brient, JC Machefert, F Rouge, A Swynghedauw, M Tanaka, R Videau, H Focardi, E Parrini, G Zachariadou, K Antonelli, A Antonelli, M Bencivenni, G Bologna, G Bossi, F Campana, P Capon, G Chiarella, V Laurelli, P Mannocchi, G Murtas, F Murtas, GP Passalacqua, L Pepe-Altarelli, M Chalmers, M Kennedy, J Lynch, JG Negus, P O'Shea, V Raeven, B Smith, D Teixeira-Dias, P Thompson, AS Cavanaugh, R Dhamotharan, S Geweniger, C Hanke, P Hepp, V Kluge, EE Leibenguth, G Putzer, A Tittel, K Werner, S Wunsch, M Beuselinck, R Binnie, DM Cameron, W Davies, G Dornan, PJ Girone, M Marinelli, N Nowell, J Przysiezniak, H Sedgbeer, JK Thompson, JC Thomson, E White, R Ghete, VM Girtler, P Kneringer, E Kuhn, D Rudolph, G Bowdery, CK Buck, PG Clarke, DP Ellis, G Finch, AJ Foster, F Hughes, G Jones, RWL Robertson, NA Smizanska, M Giehl, I Holldorfer, F Jakobs, K Kleinknecht, K Krocker, M Muller, AS Nurnberger, HA Quast, G Renk, B Rohne, E Sander, HG Schmeling, S Wachsmuth, H Zeitnitz, C Ziegler, T Bonissent, A Carr, J Coyle, P Curtil, C Ealet, A Fouchez, D Leroy, O Kachelhoffer, T Payre, P Rousseau, D Tilquin, A Aleppo, M Gilardoni, S Ragusa, F Dietl, H Ganis, G Heister, A Huttmann, K Lutjens, G Mannert, C Manner, W Moser, HG Schael, S Settles, R Stenzel, H Wiedenmann, W Wolf, G Azzurri, P Boucrot, J Callot, O Davier, M Duflot, L Grivaz, JF Heusse, P Jacholkowska, A Serin, L Veillet, JJ Videau, I de Regie, JBD Zerwas, D Bagliesi, G Boccali, T Calderini, G Ciulli, V Foa, L Giammanco, A Giassi, A Ligabue, F Messineo, A Palla, F Rizzo, G Sanguinetti, G Sciaba, A Sguazzoni, G Tenchini, R Venturi, A Verdini, PG Blair, GA Coles, J Cowan, G Green, MG Hutchcroft, DE Jones, LT Medcalf, T Strong, JA von Wimmersperg-Toeller, JH Clifft, RW Edgecock, TR Norton, PR Tomalin, IR Bloch-Devaux, B Boumediene, D Colas, P Fabbro, B Faif, G Lancon, E Lemaire, MC Locci, E Perez, P Rander, J Renardy, JF Rosowsky, A Seager, P Trabelsi, A Tuchming, B Vallage, B Black, SN Dann, JH Loomis, C Kim, HY Konstantinidis, N Litke, AM McNeil, MA Taylor, G Booth, CN Cartwright, S Combley, F Hodgson, PN Lehto, M Thompson, LF Affholderbach, K Bohrer, A Brandt, S Grupen, C Hess, J Misiejuk, A Prange, G Sieler, U Borean, C Giannini, G Gobbo, B He, H Putz, J Rothberg, J Wasserbaech, S Armstrong, SR Cranmer, K Elmer, P Ferguson, DPS Gao, Y Gonzalez, S Hayes, OJ Hu, H Jin, S Kile, J McNamara, PA Nielsen, J Orejudos, W Pan, YB Saadi, Y Scott, IJ Walsh, J Wu, J Wu, SL Wu, X Zobernig, G
Citation
R. Barate et al., Search for gamma gamma decays of a Higgs boson produced in association with a fermion pair in e(+)e(-) collisions at LEP, PHYS LETT B, 487(3-4), 2000, pp. 241-252
Citations number
25
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
0370-2693 → ACNP
Volume
487
Issue
3-4
Year of publication
2000
Pages
241 - 252
Database
ISI
SICI code
0370-2693(20000817)487:3-4<241:SFGGDO>2.0.ZU;2-1
Abstract
A search for yy decays of a Higgs boson is performed in the data sample col lected at LEP with the ALEPH detector between 1991 and 1999. This correspon ds to an integrated luminosity of 672pb(-1) at centre-of-mass energies rang ing from 88 to 202 GeV. The search is based on topologies arising from a Hi ggs boson produced in association with a fermion pair via the Higgs-strahlu ng process e(+)e(-)--> Hf (f) over bar with f (f) over bar = nu<(nu)over ba r>, e(+)e(-), mu(+)mu(-),tau(+)tau(-) or q (q) over bar. Twenty-two events are selected in the data, while 28 events are expected from standard model processes. An upper limit is derived, as a function of the Higgs boson mass , on the product of the e(+)e(-)--> Hf (f) over bar: cross section and the H --> gamma gamma branching fraction. In particular, a fermiophobic Higgs b oson produced with the standard model cross section is excluded at 95% conf idence level for all masses below 100.7 GeV/c(2). (C) 2000 Elsevier Science B.V. All rights reserved.