CERN Accelerating science

Article
Report number hep-ex/0610056 ; OPAL-PR-417 ; CERN-PH-EP-2006-026 ; CERN-PH-EP-2006-026 ; OPAL-PR-417
Title Search for Invisibly Decaying Higgs Bosons with Large Decay Width Using the OPAL Detector at LEP
Author(s)

Abbiendi, G. (INFN, Bologna) ; Ainsley, C. (Cambridge U.) ; Akesson, P.F. (CERN) ; Alexander, G. (Tel Aviv U.) ; Anagnostu, G. ; Anderson, K.J. (Fermilab) ; Asai, S. (Tokyo U., ICEPP) ; Axen, D. (British Columbia U.) ; Bailey, I. (Liverpool U.) ; Barberio, E. (Melbourne U.) ; Bailari, T. ; Barlow, R.J. (Manchester U.) ; Batly, R.J. ; Bechtle, P. (Bonn U.) ; Behnke, T. (DESY) ; Bell, Kenneth Watson (Rutherford) ; Bell, P.J. (Geneva U.) ; Bella, G. (Tel Aviv U.) ; Bellerive, A. (Carleton U.) ; Benelli, G. (Kansas U.) ; Bethke, S. (Munich, Max Planck Inst.) ; Biebel, O. (Munich U.) ; Boeriu, O. (Witwatersrand U.) ; Bock, P. (Heidelberg U.) ; Boutemeur, M. (Munich U.) ; Braibant, S. (Indiana U.) ; Brown, Robert M. (Rutherford) ; Burckhart, H.J. (CERN) ; Campana, S. (CERN) ; Capiluppi, P. (Bologna U. ; INFN, Bologna) ; Carnegie, R.K. (SLAC) ; Carter, A.A. (Queen Mary, U. of London) ; Carter, J.R. (Cambridge U.) ; Chang, C.Y. (Maryland U. ; Taiwan, Natl. Taiwan U.) ; Charlton, D.G. (Birmingham U.) ; Ciocca, C. (Bologna U. ; INFN, Bologna) ; Csilling, A. (Budapest, RMKI) ; Cuffiani, M. (Bologna U. ; INFN, Bologna) ; Dado, S. (Technion) ; De Roeck, A. (CERN) ; De Wolf, E.A. (Antwerp U.) ; Desch, K. (Bonn U.) ; Dienes, B. (Debrecen, Inst. Nucl. Res. ; U. Debrecen, Inst. Phys.) ; Dubbert, J. (Michigan U.) ; Duchovni, E. (Weizmann Inst.) ; Duckeck, G. (Munich U.) ; Duerdoth, I.P. (Manchester U.) ; Etzion, E. (Tel Aviv U.) ; Fabbri, F. (INFN, Bologna) ; Ferrari, P. (FOM, Amsterdam) ; Fiedler, F. (Mainz U.) ; Fleck, I. (Siegen U.) ; Ford, M. (Cambridge U.) ; Frey, A. (CERN) ; Gagnon, P. (Indiana U.) ; Gary, John William (UC, Riverside) ; Geich-Gimbel, C. (Bonn U.) ; Giacomelli, G. (Bologna U. ; INFN, Bologna) ; Giacomelli, P. (INFN, Bologna) ; Giunta, Marina (CERN) ; Goldberg, J. (Technion) ; Gross, E. (Weizmann Inst.) ; Grunhaus, J. (Tel Aviv U.) ; Gruwe, M. (CERN) ; Gupta, A. (Chicago U., EFI) ; Hajdu, C. (Budapest, RMKI) ; Hamann, M. (DESY) ; Hanson, G.G. (UC, Riverside) ; Harel, A. (Rochester U.) ; Hauschild, M. (CERN) ; Hawkes, C.M. (Birmingham U.) ; Hawkings, R. (CERN) ; Herten, G. (Freiburg U.) ; Heuer, R.D. (Heidelberg U.) ; Hill, J.C. (Cal State, Dominguez Hills) ; Horvath, D. (Budapest, RMKI ; Debrecen, Inst. Nucl. Res.) ; Igo-Kemenes, P. (Heidelberg U.) ; Ishii, K. (KEK, Tsukuba) ; Jeremie, H. (Montreal U.) ; Jovanovic, P. (Birmingham U.) ; Junk, T.R. (Illinois U., Urbana) ; Kanzaki, J. (KEK, Tsukuba) ; Karlen, D. (Ottawa Carleton Inst. Phys.) ; Kawagoe, K. (Kyushu U.) ; Kawamoto, T. (Tokyo U., ICEPP) ; Keeler, R.K. (Victoria U.) ; Kellogg, R.G. (Maryland U.) ; Kennedy, B.W. (Rutherford) ; Kluth, S. (Munich, Max Planck Inst.) ; Kobayashi, T. (Tokyo U., ICEPP) ; Kobel, M. (Dresden, Tech. U.) ; Komamiya, S. (Tokyo U.) ; Kramer, T. (Fermilab) ; Krasznahorkay, A., Jr. (CERN) ; Krieger, P. (Toronto U.) ; von Krogh, J. (Heidelberg U.) ; Kuhl, T. (DESY) ; Kupper, M. (Weizmann Inst.) ; Lafferty, G.D. (Manchester U.) ; Landsman, H. (Weizmann Inst.) ; Lanske, D. (Aachen, Tech. Hochsch.) ; Lellouch, D. (Weizmann Inst.) ; Letts, J. (UC, San Diego) ; Levinson, L. (Weizmann Inst.) ; Lillich, J. (Freiburg U.) ; Lloyd, S.L. (Queen Mary, U. of London) ; Loebinger, F.K. (Manchester U.) ; Lu, J. (IGPP, UCLA ; Keck Observ. ; UCLA) ; Ludwig, A. (Heidelberg, Max Planck Inst.) ; Ludwig, J. (Freiburg U.) ; Mader, W. (Dresden, Tech. U.) ; Marcellini, S. (INFN, Bologna) ; Martin, A.J. (Queen Mary, U. of London) ; Mashimo, T. (Tokyo U., ICEPP) ; Mattig, Peter (Wuppertal U.) ; McKenna, J. (British Columbia U.) ; McPherson, R.A. (IPP, Canada ; Victoria U.) ; Meijers, F. (CERN) ; Menges, W. (Queen Mary, U. of London) ; Merritt, F.S. (Chicago U., EFI) ; Mes, H. (Carleton U. ; CRPP, Ottawa) ; Meyer, N. (Hamburg U.) ; Michelini, A. (CERN) ; Mihara, S. (KEK, Tsukuba ; Tokyo U., ICEPP ; Waseda U., Cosmic Ray Div.) ; Mikenberg, G. (Weizmann Inst.) ; Miller, D.J. (University Coll. London) ; Mohr, W. (Freiburg U.) ; Mori, T. (Osaka U.) ; Mutter, A. (Freiburg U.) ; Nagai, K. (Oxford U.) ; Nakamura, I. (Pennsylvania U.) ; Nanjo, H. (Hirosaki U.) ; Neal, H.A. (Yale U.) ; Nisius, R. (Munich, Max Planck Inst.) ; O'Neale, S.W. (Birmingham U.) ; Oh, A. (Manchester U.) ; Oreglia, M.J. (Chicago U., EFI) ; Orito, S. (KEK, Tsukuba ; Kobe U. ; Tokyo U.) ; Pahl, C. (Munich, Max Planck Inst.) ; Pasztor, G. (Carleton U.) ; Pilcher, J.E. (Chicago U., EFI) ; Pinfold, J. (Alberta U.) ; Plane, D.E. (CERN) ; Pooth, O. (Aachen, Tech. Hochsch.) ; Przybycien, M. (AGH-UST, Cracow) ; Quadt, A. (Gottingen U., II. Phys. Inst.) ; Rabertz, K. ; Rembser, C. (CERN) ; Renkel, P. (Southern Methodist U.) ; Roney, J.M. (Victoria U.) ; Rossi, A.M. (Bologna U. ; INFN, Bologna) ; Rozen, Y. (Technion) ; Runge, K. (Freiburg U.) ; Sachs, K. (Julich, Forschungszentrum) ; Saeki, T. (Tokyo U.) ; Sarkisyan, E.K.G. (Texas U., Arlington) ; Schaile, A.D. (Munich U.) ; Schaile, O. (Freiburg U.) ; Scharff-Hansen, P. (CERN) ; Schieck, J. (TU Vienna ; Vienna, OAW) ; Schorner-Sadenius, T. (DESY) ; Schroder, M. (Hamburg U.) ; Schumacher, M. (Freiburg U.) ; Seuster, R. (TRIUMF) ; Shears, T.G. (Liverpool U.) ; shen, B.C. (UC, Riverside) ; sherwood, P. (University Coll. London) ; Skuja, A. (Maryland U.) ; Smith, A.M. (CERN) ; Sobie, R. (IPP, Canada ; Victoria U.) ; Soldner-Rembold, S. (Manchester U.) ; Stahl, A. (Aachen, Tech. Hochsch.) ; Strom, David M. (Oregon U.) ; Strohmer, R. (Wurzburg U.) ; Tarem, S. (Technion) ; Tasevsky, M. (Prague, Inst. Phys.) ; Teuscher, R. (IPP, Canada ; Toronto U.) ; Thomson, M.A. (Cambridge U.) ; Torrence, E. (Oregon U.) ; Toya, D. (Tokyo U., ICEPP) ; Tran, P. (UC, Riverside) ; Trigger, I. (TRIUMF) ; Trocsanyi, Z. (U. Debrecen, Inst. Phys.) ; Tsur, E. (Tel Aviv U.) ; Turner-Watson, M.F. (CERN) ; Ueda, I. (Tokyo U., ICEPP) ; Ujvari, B. (U. Debrecen, Inst. Phys.) ; Vollmer, C.F. (Munich U.) ; Vannerem, P. (Freiburg U.) ; Vertesi, R. (Rez, Nucl. Phys. Inst.) ; Verzocchi, M. (Fermilab) ; Voss, H. (Heidelberg, Max Planck Inst.) ; Vossebeld, J. (Liverpool U.) ; Ward, C.P. (Cambridge U.) ; Ward, D.R. (Cambridge U.) ; Watkins, P.M. (Birmingham U.) ; Watson, A.T. (Birmingham U.) ; Watson, N.K. (Birmingham U.) ; Wells, P.S. (CERN) ; Wengler, T. (CERN) ; Wermes, N. (Bonn U.) ; Wilson, G.W. (Kansas U.) ; Wilson, J.A. (Birmingham U.) ; Wolf, G. (DESY) ; Wyatt, T.R. (Manchester U.) ; Yamashita, S. (Tokyo U.) ; Zer-Zion, D. (UC, Riverside) ; Zivkovic, Lidija (Belgrade U.)

Affiliation (School of Physics and Astronomy, University of Birmingham) ; (Dipartimento di Fisica dell Universita di Bologna and INFN) ; (Physikalisches Institut, Universitat Bonn) ; (Department of Physics, University of California) ; (Cavendish Laboratory, Cambridge) ; (Ottawa-Carleton Institute for Physics, Department of Physics, Carleton University) ; (Enrico Fermi Institute and Department of Physics, University of Chicago) ; (Fakultat fur Physik, Albert Ludwigs Universitat, Freiburg) ; (Physikalisches Institut, Universitat Heidelberg) ; (Indiana University, Department of Physics) ; (Queen Mary and Westfield College, University of London,) ; (Technische Hochschule Aachen, III Physikalisches Institut, Aachen) ; (University College London) ; (Department of Physics, Schuster Laboratory, Manchester) ; (Department of Physics, University of Maryland) ; (Laboratoire de Physique Nucleaire, Universite de Montreal) ; (University of Oregon, Department of Physics) ; (CLRC Rutherford Appleton Laboratory) ; (Department of Physics, Technion-Israel Institute of Technology) ; (Department of Physics and Astronomy, Tel Aviv University) ; (International Centre for Elementary Particle Physics and Department of Physics, University of Tokyo) ; (Kobe University) ; (Particle Physics Department, Weizmann Institute of Science) ; (Universitat Hamburg/DESY) ; (University of Victoria, Department of Physics) ; (University of British Columbia, Department of Physics) ; (University of Alberta, Department of Physics) ; (Research Institute for Particle and Nuclear Physics, Budapest) ; (Institute of Nuclear Research, Hungary) ; (Ludwigs-Maximilians-Universitat Munchen) ; (Max-Planck-Institute fur Physik, Munchen) ; (Yale University,Department of Physics) ; (TRIUMF) ; (CERN)
Publication 2007
Imprint 03 Aug 2006
Number of pages 30
Note revised version submitted on 2006-11-08 17:06:54
In: Eur. Phys. J. C 49 (2007) 457-472
DOI 10.1140/epjc/s10052-006-0170-x
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LEP ; OPAL
Abstract This paper describes a topological search for an invisibly decaying Higgs boson,H, produced via the Bjorken process (e+e- -> HZ). The analysis is based on data recorded using the OPAL detector at LEP at centre-of-mass energies from 183 to 209 GeV corresponding to a total integrated luminosity of 629pb-1. In the analysis only hadronic decays of the Z boson are considered. A scan over Higgs boson masses from 1 to 120 GeV and decay widths from 1 to 3000 GeV revealed no indication for a signal in the data. From a likelihood ratio of expected signal and Standard Model background we determine upper limits on cross-section times branching ratio to an invisible final state. For moderate Higgs boson decay widths, these range from about 0.07pb Mh = 60GeV) to 0.57pb (Mh = 114GeV). For decay widths above 200GeV the upper limits are of the order of 0.15pb. The results can be interpreted in general scenarios predicting a large invisible decay width of the Higgs boson. As an example we interpret the results in the so-called stealthy Higgs scenario. The limits from this analysis exclude a large part of the parameter range of this scenario experimentally accessible at LEP2.

Corresponding record in: Inspire
Email contact: [email protected]


 Záznam vytvorený 2006-10-18, zmenený 2021-10-29


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