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

R. Barate 1 D. Decamp 1 P. Ghez 1 C. Goy 1 S. Jezequel 1 J P. Lees 1 F. Martin 1 E. Merle 1 M N. Minard 1 B. Pietrzyk 1 S. Bravo M P. Casado M. Chmeissani J M. Crespo E. Fernandez M. Fernandez-Bosman L. Garrido E. Grauges J. Lopez M. Martinez G. Merino R. Miquel L M. Mir A. Pacheco D. Paneque H. Ruiz A. Colaleo D. Creanza N. de Filippis 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 Jiali Lin Q. Ouyang T. Wang Y. Xie R. Xu S. Xue J. Zhang L. Zhang W. Zhao D. Abbaneo G. Boix O. Buchmuller M. Cattaneo F. Cerutti G. Dissertori H. Drevermann R W. Forty M. Frank F. Gianotti T C. Greening a W. Halley J B. Hansen J. Harvey P. Janot B. Jost M. Kado V. Lemaitre 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. Valassi J J. Ward a E. Wright Ziad Ajaltouni 2 F. Badaud 2 G. Chazelle 2 O. Deschamps 2 S. Dessagne 2 Alain Falvard 2 Pascal Gay 2 C. Guicheney 2 Pierre Henrard 2 J. Jousset 2 B. Michel 2 S. Monteil 2 Jean-Claude Montret 2 D. Pallin 2 J M. Pascolo 2 Pascal Perret 2 F. Podlyski 2 J D. Hansen J R. Hansen P H. Hansen B S. Nilsson A. Waananen G. Daskalakis A. Kyriakis C. Markou E. Simopoulou A. Vayaki A. Blondel 3 J C. Brient 3 F. Machefert 3 A. Rouge 3 M. Swynghedauw 3 R. Tanaka 3 H. Videau 3 E. Focardi G. Parrini K. Zachariadou A. Antonelli M. Antonelli G. Bencivenni G. Bologna F. Bossi P. Campana G. Capon V. Chiarella P. Laurelli G. Mannocchi F. Murtas G P. Murtas L. Passalacqua M. Pepe-Altarelli M. Chalmers J. Kennedy J G. Lynch P. Negus V. O'Shea B. Raven D. Smith P. Teixeira-Dias a S. Thompson R. Cavanaugh S. Dhamotharan C. Geweniger P. Hanke V. Hepp E E. Kluge G. Leibenguth A. Putzer K. Tittel S. Werner M. Wunsch R. Beuselinck D M. Binnie W. Cameron G. Davies P J. Dornan M. Girone N. Marinelli J. Nowell H. Przysiezniak J K. Sedgbeer J C. Thompson E. Thomson R. White V M. Ghete P. Girtler E. Kneringer D. Kuhn G. Rudolph C K. Bowdery P G. Buck D P. Clarke G. Ellis a J. Finch F. Foster G. Hughes R W L. Jones N A. Robertson M. Smizanska I. Giehl F. Holldorfer K. Jakobs K. Kleinknecht M. Krocker a S. Muller H A. Nurnberger G. Quast B. Renk E. Rohne H G. Sander S. Schmeling H. Wachsmuth C. Zeitnitz T. Ziegler A. Bonissent 4 J. Carr 4 P. Coyle 4 C. Curtil 4 A. Ealet 4 D. Fouchez 4 O. Leroy 4 T. Kachelhoffer 4 P. Payre 4 D. Rousseau 4 A. Tilquin 4 M. Aleppo S. Gilardoni F. Ragusa H. Dietl G. Ganis A. Heister K. Huttmann G. Lutjens C. Mannert W. Manner H G. Moser S. Schael R. Settles H. Stenzel W. Wiedenmann G. Wolf P. Azzurri J. Boucrot 5 O. Callot 5 M. Davier 5 L. Duflot 5 J F. Grivaz 5 P. Heusse 5 A. Jacholkowska 5 L. Serin 5 J J. Veillet 5 I. Videau 5 J B. de Vivie de Regie 5 D. Zerwas 5 G. Bagliesi T. Boccali G. Calderini V. Ciulli L. Foa A. Giammanco A. Giassi F. Ligabue A. Messineo F. Palla G. Rizzo G. Sanguinetti A. Sciaba G. Sguazzoni R. Tenchini A. Venturi P G. Verdini G A. Blair J. Coles G. Cowan M G. Green D E. Hutchcroft L T. Jones T. Medcalf J A. Strong J H. von Wimmersperg-Toeller R W. Clifft T R. Edgecock P R. Norton I R. Tomalin B. Bloch-Devaux D. Boumediene P. Colas B. Fabbro G. Faif E. Lancon M C. Lemaire E. Locci P. Perez J. Rander J F. Renardy A. Rosowsky P. Seager A. Trabelsi B. Tuchming B. Vallage S N. Black J H. Dann C. Loomis H Y. Kim N. Konstantinidis a M. Litke M A. Mcneil G. Taylor C N. Booth S. Cartwright F. Combley P N. Hodgson M. Lehto L F. Thompson K. Affholderbach A. Bohrer S. Brandt C. Grupen J. Hess A. Misiejuk G. Prange U. Sieler C. Borean G. Giannini B. Gobbo H. He J. Putz J E. Rothberg S. Wasserbaech S R. Armstrong K. Cranmer P. Elmer D P S. Ferguson Y. Gao S. Gonzalez O J. Hayes H. Hu S. Jin J. Kile P A. Mcnamara J. Nielsen W. Orejudos y B. Pan Y. Saadi I J. Scott J. Walsh J. Wu S L. Wu X. Wu G. Zobernig
Abstract : A search for gamma-gamma decays of a Higgs boson is performed in the data sample collected at LEP with the ALEPH detector between 1991 and 1999. This corresponds to an integrated luminosity of 672 pb-1 at centre-of-mass energies ranging from 88 to 202 GeV. The search is based on topologies arising from a Higgs boson produced in association with a fermion pair via the Higgs-strahlung process e+e- -> Hff, with ff=nu\nu, e+e-, mu+mu-, tau+tau- or qq. 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- -> Hff cross section and the H -> gamma-gamma branching fraction. In particular, a fermiophobic Higgs boson produced with the standard model cross section is excluded at 95% confidence level for all masses below $100.7 GeV.
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Submitted on : Friday, September 15, 2000 - 12:12:43 PM
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R. Barate, D. Decamp, P. Ghez, C. Goy, S. Jezequel, et al.. Search for $\gamma\gamma$ decays of a Higgs boson produced in association with a fermion pair in $e^+ e^-$ collisions at LEP. International conference on high-energy physics (ICHEP 2000) 30, Jul 2000, Osaka, Japan. pp.241-252. ⟨in2p3-00005633⟩

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