Search for Higgs bosons decaying to WW in e + e - collisions at LEP

S. Schael,R. Barate, R. Brunelière, I. De Bonis, D. Decamp, C. Goy, S. Jézéquel, J.-P. Lees,F. Martin,E. Merle, M.-N. Minard,B. Pietrzyk,B. Trocmé,S. Bravo,M.P. Casado,M. Chmeissani,J.M. Crespo, E. Fernandez,M. Fernandez-Bosman, L. Garrido,M. Martinez,A. Pacheco,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,J. Lin,Q. Ouyang, T. Wang,Y. Xie,R. Xu,S. Xue,J. Zhang,L. Zhang, W. Zhao, D. Abbaneo,T. Barklow, O. Buchmüller,M. Cattaneo,B. Clerbaux,H. Drevermann,R.W. Forty,M. Frank,F. Gianotti,J.B. Hansen,J. Harvey,D.E. Hutchcroft,P. Janot,B. Jost, M. Kado,P. Mato,A. Moutoussi, F. Ranjard,L. Rolandi,D. Schlatter, F. Teubert,A. Valassi,I. Videau,F. Badaud,S. Dessagne, A. Falvard,D. Fayolle,P. Gay, J. Jousset,B. Michel,S. Monteil, D. Pallin,J.M. Pascolo,P. Perret,J.D. Hansen,J.R. Hansen, P.H. Hansen,A.C. Kraan,B.S. Nilsson, A. Kyriakis,C. Markou, E. Simopoulou,A. Vayaki,K. Zachariadou,A. Blondel,J.-C. Brient,F. Machefert,A. Rougé,H. Videau,V. Ciulli,E. Focardi,G. Parrini,A. Antonelli,M. Antonelli,G. Bencivenni,F. Bossi,G. Capon,F. Cerutti,V. Chiarella,P. Laurelli,G. Mannocchi,G.P. Murtas,L. Passalacqua,J. Kennedy,J.G. Lynch, P. Negus,V. O’Shea, A.S. Thompson,S. Wasserbaech,R. Cavanaugh, S. Dhamotharan,C. Geweniger, P. Hanke,V. Hepp,E.E. Kluge, A. Putzer, H. Stenzel,K. Tittel, M. Wunsch,R. Beuselinck,W. Cameron,G. Davies,P.J. Dornan,M. Girone, N. Marinelli, J. Nowell,S.A. Rutherford,J.K. Sedgbeer,J.C. Thompson,R. White, V.M. Ghete, P. Girtler,E. Kneringer, D. Kuhn, G. Rudolph, E. Bouhova-Thacker,C.K. Bowdery,D.P. Clarke,G. Ellis,A.J. Finch, F. Foster, G. Hughes,R.W.L. Jones,M.R. Pearson,N.A. Robertson,M. Smizanska,O. van der Aa,C. Delaere, G. Leibenguth,V. Lemaitre, U. Blumenschein, F. Hölldorfer, K. Jakobs, F. Kayser, A.-S. Müller,B. Renk,H.-G. Sander,S. Schmeling,H. Wachsmuth,C. Zeitnitz,T. Ziegler,A. Bonissent,P. Coyle,C. Curtil,A. Ealet,D. Fouchez,P. Payre,A. Tilquin,F. Ragusa,A. David,H. Dietl,G. Ganis, K. Hüttmann, G. Lütjens, W. Männer,H.-G. Moser,R. Settles,M. Villegas,G. Wolf, J. Boucrot,O. Callot,M. Davier, L. Duflot,J.-F. Grivaz,P. Heusse,A. Jacholkowska, L. Serin,J.-J. Veillet,P. Azzurri,G. Bagliesi,T. Boccali,L. Foà,A. Giammanco, A. Giassi, F. Ligabue, A. Messineo,F. Palla,G. Sanguinetti,A. Sciabà,G. Sguazzoni,P. Spagnolo, R. Tenchini,A. Venturi,P.G. Verdini,O. Awunor,G.A. Blair,G. Cowan, A. Garcia-Bellido,M.G. Green, T. Medcalf, A. Misiejuk,J.A. Strong,P. Teixeira-Dias,R.W. Clifft,T.R. Edgecock,P.R. Norton, I.R. Tomalin,J.J. Ward,B. Bloch-Devaux,D. Boumediene,P. Colas, B. Fabbro,E. Lançon,M.-C. Lemaire, E. Locci, P. Perez, J. Rander,B. Tuchming,B. Vallage,A.M. Litke,G. Taylor,C.N. Booth,S. Cartwright, F. Combley, P.N. Hodgson,M. Lehto,L.F. Thompson,A. Böhrer, S. Brandt,C. Grupen, J. Hess, A. Ngac, G. Prange,C. Borean,G. Giannini, H. He,J. Putz, J. Rothberg,S.R. Armstrong, K. Berkelman,K. Cranmer,D.P.S. Ferguson, Y. Gao,S. González,O.J. Hayes,H. Hu,S. Jin, J. Kile,P.A. McNamara III,J. Nielsen,Y.B. Pan,J.H. von Wimmersperg-Toeller,W. Wiedenmann, J. Wu,Sau Lan Wu,X. Wu, G. Zobernig, G. Dissertori

The European Physical Journal C（2006）

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Abstract

A search for Higgs bosons produced in association with a fermion pair, and decaying to WW, is performed with the data collected by the ALEPH detector at centre-of-mass energies ranging from 191 to 209 GeV. The data correspond to an integrated luminosity of 453.2 pb -1 . Thirteen exclusive selections are developed according to the different final state topologies. No statistically significant evidence for a Higgs boson decaying into a WW pair has been found. An upper limit is derived, as a function of the Higgs boson mass, on the product of the e + e - →Hff̄ cross section and the H→WW branching ratio. The data on the search for H→WW are combined with previously published ALEPH results on the search for H→γγ, to significantly extend the limits on the mass of a fermiophobic Higgs boson.

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Key words

Higgs Boson,Invariant Mass,Higgs Boson Mass,Time Projection Chamber,Inant Variable

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