A flavour-independent Higgs boson search in e+e− collisions at√s up to 209 GeV

Arno Heister,Stefan Schael, R. Barate, R. Brunelière,I. De Bonis,D. Decamp,Corinne Goy,Stéphane Jézéquel,J. P. Lees,F. Martin, E. Merle, M. N. Minard,B. Pietrzyk,Benjamin Trocmé,G. Boix, S. Bravo,Maria Pilar Casado,M. Chmeissani, J. M. Crespo,E. Fernandez,M. Fernandez-Bosman, Ll. Garrido,E. Grauges,J. Lopez,M. Martinez, G. Merino,Ramon Miquel,Ll. M. Mir,A. Pacheco,David Paneque,H. Ruiz,Anna Colaleo, Donato Creanza,N. De Filippis,M. De Palma,Giuseppe Iaselli, G. Maggi,Mario Maggi,Salvatore Nuzzo,A. Ranieri,Giuseppe Raso,F. Ruggieri,Giovanna Selvaggi,Lucia Silvestris, P. Tempesta, Alessia Tricomi, Giuseppe Zito,X. Huang,Jiali Lin,Qun Ouyang, Ting Wang,Yuehong Xie,R. Xu,S. Xue,Jie Zhang, Lei Zhang,W. Zhao,Duccio Abbaneo,Paolo Azzurri,Timothy Barklow, O. Buchmüller,Marco Cattaneo,F. Cerutti,Barbara Clerbaux,H. Drevermann, Roger Forty,Markus Frank,F. Gianotti, T.C. Greening,John-Bjarne Hansen,John T Harvey,David Hutchcroft,Patrick Janot, B. Jost,Marumi Kado,Pere Mato, A. Moutoussi,F. Ranjard,L. Rolandi, D. Schlatter, Giacomo Sguazzoni, W. Tejessy, F. Teubert,Andrea Valassi, I. Videau,J.J. Ward, F. Badaud, S. Dessagne,Alain Falvard, D. Fayolle, J. Jousset,B. Michel,S. Monteil,Dominique Pallin, J.M. Pascolo, P. Perret,J. D. Hansen,John H. L. Hansen,P. H. Hansen,B.S. Nilsson

Physics Letters B（2002）

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摘要

A search for the Higgsstrahlung process e+e−→HZ is carried out, covering decays of the Higgs boson into any quark pair, a gluon pair or a tau pair. The analysis is based on the 630 pb−1 of data collected by the ALEPH detector at LEP at centre-of-mass energies from 189 to 209 GeV. A 95% C.L. lower mass limit of 109.1 GeV/c2 is obtained for a Higgs boson cross section equal to that expected from the Standard Model if the Higgs boson decays exclusively into hadrons and/or taus, irrespective of the relative branching fractions.

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